Dr. Pankaj Tiwari

Associate Professor

Key Research Areas :Conventional and unconventional energies, Reservoir Engineering, Complex organic solids, Biomass conversion, Pyrolysis process, Kinetic analysis.


1. B. Baruah and P. Tiwari, "Soaking and hydrous pyrolysis of Indian oil shale: Identification of produced hydrocarbons and moieties", Fuel [2022]

2. S Pannu, R Phukan, P Tiwari, "Experimental and simulation study of surfactant flooding using a combined surfactant system for enhanced oil recovery ", Petroleum Science and Technology [2022]

3. S. Solanki, B. Baruah and P. Tiwari, "Modeling and simulation of wood pyrolysis process using COMSOL Multiphysics", Bioresource Technology Reports, 17, 100941 [2022]

4. V. K. Sharma, R. Bhowmik, P. Tiwari and A. Singh, "Pore-scale investigation of immiscible fluid displacement process in randomly distributed bead-based porous micromodels using Micro-PIV", Journal of Petroleum Science and Engineering, 212, 110301 [2022]

5. P. Datta, P. Tiwari and L. M. Pandey, "Experimental investigation on suitability of Surfactin for enhanced oil recovery: Stability, adsorption equilibrium and kinetics studies", Journal of Environmental Chemical Engineering, 10, 107083 [2022]

6. B. Baruah and P. Tiwari, "Investigation of co-pyrolysis mechanism of oil shale and rubber seed shell, product yield and optimization of pyrolysis parameter using response surface methodology", Fuel, 317, 123441 [2022]

1. V. K. Sharma, P. Tiwari and A. Singh, "Micro-particle Image Velocimetry Measurements of Pore-Scale Velocity Field during Nanoparticle-Assisted Alkaline Flooding", Energy & Fuels, 35, 12957 [2021]

2. A. K. Paul, V. B. Borugadda, A. S. Reshad, M. S. Bhalerao, P. Tiwari and V. V. Goud, "Comparative study of physicochemical and rheological property of waste cooking oil, castor oil, rubber seed oil, their methyl esters and blends with mineral diesel fuel", Materials Science for Energy Technologies, 4, 148 [2021]

3. B. Baruah and P. Tiwari, "Compositional and kinetic study of thermal degradation of kerogen using TG-FTIR, NMR, and microscopic study", AIChE Journal, 68, 17396 [2021]

1. B Baruah, P Tiwari , "Effect of high-pressure on non-isothermal pyrolysis kinetics of oil shale and product yield", Energy and Fuels, doi.org/10.1021/acs.energyfuels.0c02538 [2020]

2. P Datta, P Tiwari, LM Pandey, "Oil washing proficiency of biosurfactant produced by isolated Bacillus tequilensis MK 729017 from Assam reservoir soil", Journal of Petroleum Science and Engineering, 195, 107612 [2020]

3. R Phukan, SB Gogoi, P Tiwari, "Effects of CO2-foam stability, interfacial tension and surfactant adsorption on oil recovery by alkaline-surfactant-alternated-gas/CO2 flooding", Colloids and Surfaces A: Physicochemical and Engineering Aspects, 597, 124799 [2020]

1. S. Sharma, P. Datta, B. Kumar, P. Tiwari, and L. M. Pandey, "Production of novel Rhamnolipids via biodegradation of waste cooking oil using pseudomonas aeruginosa MTCC7815", Biodegradation, 30, 301-312 [2019]

2. R. Saha, R. V. S. Uppaluri, and P. Tiwari, "Impact of natural surfactant (reetha), polymer (xanthan gum), and silica nanoparticles to enhance heavy crude oil recovery", Energy and Fuels, 33, 4225-4236 [2019]

3. A. S. Reshad, P. Tiwari, and V. V. Goud, "Thermal and co-pyrolysis of rubber seed cake with waste polystyrene for bio-oil production", Journal of Analytical and Applied Pyrolysis, 139, 333-343 [2019]

4. R. Phukan, S. Borgohain Gogoi, P. Tiwari, and R. Singh Vadhan, "Optimization of immiscible alkaline-surfactant-alternated-gas/co flooding in an upper assam oilfield", SPE Western Regional Meeting, San Jose, California, USA [2019]

5. M. R. Mallela, P. Tiwari, and A. Singh, "Effect of carrier fluid rheology on shear-induced particle migration in asymmetric t-shaped bifurcation channel", International Journal of Multiphase Flow, 111, 272-284 [2019]

6. P. Das and P. Tiwari, "Thermal degradation study of waste polyethylene terephthalate (PET) under inert and oxidative environments", Thermochimica Acta, 679, 178340 [2019]

7. B. Baruah, R. Kataki, P. Thakur, and P. Tiwari, "Detailed physicochemical and thermochemical investigation of upper assam oil shale", Journal of Thermal Analysis and Calorimetry, 138, 1221-1232 [2019]

8. R Phukan, SB Gogoi, P Tiwari, "Alkaline-surfactant-alternated-gas/CO2 flooding: Effects of key parameters", Journal of Petroleum Science and Engineering, 173, 547-557 [2019]

1. P. Datta, P. Tiwari, and L. M. Pandey, "Isolation and characterisation of biosurfactant production and oil degradation bacillus subtilis MG495086 from formation water of Assam oil reservoir and its suitability of enhanced oil recovery", Bioresource Technology, 10.1016/j.biortech.2018.09.047, 10.1016/j.biortech.2018.09.047 [2018]

2. R. Saha, R. V. S. Uppaluri, and P. Tiwari, "Effects of interfacial tension, oil layer break time, emulsion and wettability alteration on oil recovery for carbonate reservoirs", Colloids and Surfaces A: Physicochemical and Engineering Aspects, org /10.1016/j.colsurfa.2018.09.045, org /10.1016/j.colsurfa.2018.09.045 [2018]

3. B. Baruah, P. Tiwari, P. Thakur, and R. Kataki, "TGA-FTIR analysis of upper assam oil shale, optimization of lab-scale pyrolysis process parameters using RSM", Journal of Analytical and Applied Pyrolysis, doi.org/10.1016/j.jaap.2018.08.005, doi.org/10.1016/j.jaap.2018.08.005 [2018]

4. P. Das and P. Tiwari, "The effect of slow pyrolysis on the conversion of packaging waste plastics (PE and PP) into fue", Waste Management, 79, 615-624 [2018]

5. P. Das and P. Tiwari, "Valorization of packaging plastic waste by slow pyrolysis", Resources, Conservation and Recycling, 128, 69-77 [2018]

6. R. Saha, R. V. S. Uppaluri, and P. Tiwari, "Silica nanoparticle assisted polymer flooding of heavy crude oil: Emulsification, rheology, and wettability alteration characteristics", Industrial & Engineering Chemistry Research, 57, 6364-6376 [2018]

7. R. Saha, A. Sharma, R. V. S. Uppaluri, and P. Tiwari, "Interfacial interaction and emulsification of crude oil to enhance oil recovery", International Journal of Oil, Gas and Coal Technology, 10.1504/IJOGCT.2018.10011553, 10.1504/IJOGCT.2018.10011553 [2018]

8. R. Phukan, S. B. Gogoi, and P. Tiwari, "Enhanced oil recovery by alkaline-surfactant-alternated-gas/CO2 flooding", Journal of Petroleum Exploration and Production Technology, Dibrugarh University, doi.org/10.1007/s13202-018-0465-0, doi.org/10.1007/s13202-018-0465-0 [2018]

9. R. Saha, R. V. S. Uppaluri, and P. Tiwari, "Influence of emulsification, interfacial tension, wettability alteration and saponification on residual oil recovery by alkali flooding", Journal of Industrial and Engineering Chemistry, 59, 286-296 [2018]

1. Ali ShemsedinReshad, Pankaj Tiwari, Vaibhav V Goud , , "Thermal decomposition and kinetics of residual rubber seed cake and shell", Journal of Thermal Analysis and Calorimetry, 129, 577-592 [2017]

2. Ali Shemsedin Reshad, Deoashish Panjiara, Pankaj Tiwari,Vaibhav V Goud , "Two-step process for Production of Methyl Ester from Rubber Seed Oil using Barium Hydroxide Octahydrate Catalyst: Process Optimization", Journal of Cleaner Production, 142, 4, 3490-3499 [2017]

3. S. P. K. Vangala, A. Chaudhary, P. Tiwari, and V. Katiyar, "Thermal degradation kinetics of biopolymers and their composites: Estimation of appropriate kinetic parameters", Journal of Energy and Environmental Sustainability, 3, 10-19 [2017]

4. R. Saha, R. V. S. Uppaluri, and P. Tiwari, "Effect of mineralogy on the adsorption characteristics of surfactant—reservoir rock system", Colloids and Surfaces A: Physicochemical and Engineering Aspects, 531, 121-132 [2017]

5. A. S. Reshad, P. Tiwari, and V. V. Goud, "Thermal degradation kinetic study of rubber seed oil and its methyl esters under inert atmosphere", Energy and Fuels, 31, 9642-9651 [2017]

6. A. S. Reshad, P. Tiwari, and V. V. Goud, "Thermo-chemical conversion of waste rubber seed shell to produce fuel and value-added chemicals", Journal of the Energy Institute [2017]

7. P. Das and P. Tiwari, "Thermal degradation kinetics of plastics and model selection", Thermochimica Acta, 654, 191-202 [2017]

1. Pankaj Tiwari, Sanjeev Garg , , "Study of reversible kinetic models for alkali-catalyzed Jatropha curcas transesterification", Biomass Conversion and Biorefinery, 6, 1, 61-70 [2016]

1. Ali S.Reshad, Pankaj Tiwari, Vaibhav V Goud , , "Extraction of Oil from Rubber Seeds for Biodiesel Application: Process Optimization Study", Fuel, 150, 636-644 [2015]

2. Ali S.Reshad, Vaibhav V Goud, Sahoo Niranjan,Pankaj Tiwari,Kulkarni Vinayak , , "Rubber Seed Oil Methyl Ester Synthesis, Engine Performance, and Emission Characteristics of Blends", Energy Fuels, 29, 8, 5136-5144 [2015]

1. Prodyut Dhar, Sai Vangala, Kumar Phani,Pankaj Tiwari,Kumar Amit , , "Thermal Degradation Kinetics of Poly (3-hydroxybutyrate)/Cellulose Nanocrystals based Nanobiocomposite", Journal of Thermodynamics and Catalysis, 5, 2, 1-7 [2014]

1. Kumar Rajeev, Tiwari Pankaj, Garg Sanjeev , , "Alkali Transesterification of Linseed Oil for Biodiesel Production", Fuel, 104, 553-560 [2013]

2. Pankaj Tiwari, Milind Lin Deo, J.D C.L Miller , , "Characterization of Oil Shale Pore Structure Before and After Pyrolysis by Using X-ray Micro CT", Fuel, 107, 547-554 [2013]

1. Pankaj Tiwari, Milind Deo , , "Compositional and Kinetic Analysis of Oil Shale Pyrolysis using TGA–MS", Fuel, 94, 333-341 [2012]

2. PankajTiwari, Milind Deo , , "Detailed Kinetic Study of Oil Shale Pyrolysis TGA Data", AIChE J, 58, 505-515 [2012]

1. KyeongseokOh, Pankaj Tiwari, Milind Deo , , "Evaluation of Various Shale Processing Options", Oil Shale, 27, 3, 229-238 [2010]

1. P. Datta, P. Tiwari, and L. M. Pandey, "Suitability Evaluation of Surfactin Produced by Bacillus tequilensis MK 729017 for Enhanced Oil Recovery Applications (BEST PAPER AWARD)", 5th International Conference on Bioenergy, Environmental and Sustainable Technologies” (virtual mode), Arunai Engineering College, Tamil Nadu, India [2021]

1. P. Datta, P. Tiwari and L. M. Pandey, "Production and Characterization of Lipopeptide Biosurfactants from Indigenous Bacillus Strains of Assam Oil Reservoir and its Suitability for Microbial Enhanced Oil Recovery", Chemical Research 2020 – International Conference on Chemical Engineering and Chemistry, [2020]

2. P. Datta, P. Tiwari, and L. M. Pandey, "Evaluation of Oil Washing Efficiency of the Biosurfactant Produced by Bacillus tequilensis from Assam Reservoir Soil (BEST ORAL PRESENTATION AWARD)", DST-UKIERI supported Workshop cum Symposium, IIT Guwahati India [2020]

3. P. Datta, P. Tiwari, and L. M. Pandey, "Investigating the Potential of Biosurfactants for MEOR Application (BEST POSTER AWARD)", WATER 2020: : Issues & Challenges in Water Treatment and allied research for Sustainable environment, IIT Guwahati India [2020]

1. B. Baruah and P. Tiwari, "Detailed investigation of thermal degradation kinetics of p-kerogen and oil shale of north east India ", Research Conclave, IIT Guwahati, [2019]

2. B. Baruah, A. Reshad and P. Tiwari, "Non-isothermal kinetics of co-pyrolysis of Indian oil shale and rubber seed shell and characterization of pyrolytic products", National Conference on Upstream Petroleum Exploration, IIT Guwahati, [2019]

3. R. Phukan, S.B. Gogoi, and P. Tiwari and R.S.Vadhan, "Optimization of immiscible alkaline-surfactant-alternated-gas/CO2 flooding in an Upper Assam Oilfield", PE Western Regional Meeting , SoSociety of Petroleum Engineers: San Jose, California, USA, 2019, [2019]

4. R. Phukan, S. B. Gogoi, P. Tiwari and A. Goswami, "Black liquor as a sacrificial adsorbate for EOR ", Oil & Gas Workshop, Dibrugarh University, India, [2019]

5. R. Phukan, SB Gogoi, and P. Tiwari, "Characterization of reservoir rock and fluids for CO2 foam enhanced oil recovery application", Reflux, IIT Guwahati, India, [2019]

6. P. Borgohain, P. Tiwari and R. Upadhyay, "Low temperature catalyst for steam reforming of methanol ", APCAT, Bangkok, Thailand, [2019]

7. V. K. Sharma, P. Tiwari, A. Singh, "Comparative study of nanoparticles for Enhanced Oil Recovery in micromodels", COMPFLU, IISER Bhopal, India, [2019]

8. V. K. Sharma, P. Tiwari and A. Singh, "Experimental investigation of role of nanoparticles in interfacial tension reduction, wettability alteration, and rheology modification ", NCUPE, IIT Guwahati, India, [2019]

9. V. K. Sharma, P. Tiwari, A. Singh, Anugrah Singh, "Microscopic study of nanoparticles assisted alkaline flooding (NAAF) ", Reflux 7.0, IIT Guwahati, India, [2019]

10. V. K. Sharma, P. Tiwari and A. Singh, "Silica nanoparticle suspended inorganic alkaline flooding for enhanced oil recovery", Research Conclave, IIT Guwahati, India, [2019]

11. P. Datta, P. Tiwari, and L. M. Pandey, "Understanding the Role of Biosurfactants in MEOR Application", Reflux 7.0 IIT Guwahati, India, [2019]

12. P. Datta, P. Tiwari, and L. M. Pandey, "Understanding the Role of Biosurfactants in MEOR Application", CHEMCON IIT Delhi India, [2019]

1. R. Saha, R. V. S. Uppaluri, and P. Tiwari, "Role of rock mineralogy on adsorption characteristics of potential surfactant for chemical enhanced oil recovery", ISCRE, ISCRE, Florence, Italy [2018]

2. J. S. Rawat, P. Tiwari, and R. Uapdhyay, "Effect of single/multiple nozzle injection through sidewall on flow field of gas-solids fluidized bed", ISCRE, ISCRE, Florence, Italy [2018]

3. R. Phukan, S. B. Gogoi, and P. Tiwari, "Enhanced oil recovery by combined chemical/gas flooding", Research Conclave, Research Conclave, IIT Guwahati, India [2018]

4. P. Datta, P. Tiwari, and L. M. Pandey, "Characterization and optimization study of biosurfactant produced by microorganism isolated from formation water of Assam oil reservoir for MEOR application", International Conference on Waste Management “Recycle”, IIT Guwahati, India [2018]

5. P. Das and P. Tiwari, "Waste plastics: Thermal degradation kinetics and lab scale pyrolysis", ISCRE, ISCRE, Florence, Italy [2018]

6. B. Baruah, R. Kataki, P. Thakur, and P. Tiwari, "Detailed physicochemical and thermochemical analyses of Indian oil shale", ISCRE, ISCRE, Florence, Italy [2018]

7. P. Borgohain, P. Tiwari and R. Upadhyay, "Copper based bimetallic catalyst with low CO selectivity for methanol steam reforming", Research Conclave, IIT Guwahati, Assam, India,, [2018]

1. D. K. Vemula and P. Tiwari, "Carbon dioxide sequestration in geological formations", Reflux, IIT Guwahati, India [2017]

2. R. Saha, P. Tiwari, and R. V. S. Uppaluri, "Alkali and surfactant interaction with assam crude oil to recover residual oil", Advances in Petroleum, Chemical & Energy Challenges, RGIPT, Amethi, India [2017]

3. J. S. Rawat, R. K. Upadhyay, and P. Tiwari, "Experimental investigation of nozzle assisted gas - solid fluidized bed using gamma - ray densitometry and radioactive particle tracking techniques", CAMURE - 10 & ISMR - 9 Symposium, CAMURE - 10 & ISMR - 9 Symposium Qingdao, China [2017]

4. J. S. Rawat, P. Tiwari, and R. Uapdhyay, "CFD simulation of nozzle assisted gas-solid fluidized bed with experimental validation, experimental validation", CAMURE-10 & ISMR-9 symposium, CAMURE-10 & ISMR-9 symposium, Qingdao, China [2017]

5. J. S. Rawat, P. Tiwari, H. J. Pant, and R. Uapdhyay, "Investigation of the multiple side injections on hydrodynamics of the gas-solids fluidized bed using radiotracer based techniques", International Conference on Applications of Radiation Science and Technology (ICARST-2017), Vienna, Austria [2017]

6. R. Phukan, S. B. Gogoi, and P. Tiwari, "A comparative study of adsorption of anionic, non-ionic and a natural surfactant by reservoir rocks of Upper Assam basin", International Conference on "Advances in Petroleum, Chemical & Energy Challenges", RGIPT, Amethi, India [2017]

7. R. Phukan, S. B. Gogoi, and P. Tiwari, "Static and dynamic adsorption of surfactants by reservoir rocks", Reflux 2017, IIT Guwahati, India [2017]

8. H. R. Pemmana, R. Gupta, and P. Tiwari, "On the CFD modelling of flow and mixing in an oscillatory baffled reactor (OBR)", International Symposium on Complex Fluids (CompFlu-2017), IIT Madras, India [2017]

9. H. R. Pemmana, R. Gupta, and P. Tiwari, "On the CFD modelling of flow in an oscillatory baffled reactor (OBR)", 44th National Conference on Fluid Mechanics Fluid Power (FMFP-2017), Amrita University, Kerala, India [2017]

10. P. Datta, P. Tiwari, and L. M. Pandey, "Understanding the role of biosurfactants in meor application to assam oil fields", Reflux 2017, IIT Guwahati, India [2017]

11. P. Das and P. Tiwari,, "Valorization of packaging plastic waste by slow pyrolysis. National conference on non-conventional energy", Harvesting technology and its challenges, Assam Engineering College, Guwahati, , India [2017]

12. P. Das and P. Tiwari,, "Kinetics of thermal degradation of plastic waste and their conversion into liquid fuel by slow pyrolysis", ASP, Symposium on Advances in Sustainable Polymers, IIT Guwahati, India [2017]

13. P. Das and P. Tiwari, "Conversion of plastic waste into fuel by slow pyrolysis", Advances in Petroleum, Chemical & Energy Challenges, RGIPT, Amethi, India [2017]

14. B. Baruah, P. Tiwari, and R. Kataki, "Upper Assam oil shales: A detailed physicochemical and thermochemical analysis, pyrolysis & kinetic study", Reflux 2017, Indian Institute of Technology Guwahati, India [2017]

15. B. Baruah, P. Tiwari, and R. Kataki, "Upper Assam oil shales: A detailed physicochemical and thermochemical study", ONGC-India & ONGC-CPBT sponsored National Seminar on Petroleum Biotechnology and Bioenergy, Tezpur University, India [2017]

16. P. Datta, P. Tiwari, and L. M. Pandey, "Isolation and Characterization of Crude Oil Degrading Bacteria from Formation Water of Assam Oil Reservoir, India (BEST POSTER AWARD) in “Bioenergy and Biochemical Engineering” category", CHEMCON 2017, Haldia Institute of Technology, Haldia, West Bengal, India, [2017]

1. R. Saha, A. Sharma, S. Gogoi, R. Uppaluri, and P. Tiwari, "Chemical induced enhanced oil recovery for Assam crude", MRSI Conference, CSIR NEIST, Jorhat, India [2016]

2. J. S. Rawat, P. Tiwari, and R. K. Upadhyay, "Investigation of nozzle assisted gas-solid fluidized bed: Experimental and numerical approach", 3rd Indo German Workshop, IIT Guwahati, India [2016]

3. R. Phukan, S. B. Gogoi, P. Tiwari, and D. Das, "Screening of chemical formulations for alkali-surfactant-gas enhanced oil recovery process", CHEMCON 2016, Anna University & IIT Madras, India [2016]

4. R. Saha, K. Anem, R. V. S. Uppaluri, and P. Tiwari, "Experimental and simulation studies for recovery of residual Assam crude oil: Characterization of rock-fluid and screening of chemicals", 22nd international congress of chemical and process engineering CHISA, Prague, Czech Republic [2016]

5. A. S. Reshad, P. Tiwari, and V. V. Goud, "Utilization of rubber seed for biofuel synthesis", 1st International Conference on Bioscience and Biotechnology “Molecular Life Sciences for the Development in the 21st Century”, BioTech-2016, The International Institute of Knowledge Management (TIIKM), Colombo, Srilanka [2016]

6. A. S. Reshad, P. Tiwari, and V. V. Goud, "Characterization and utilization of waste rubber seed shell for production of biofuel and mixture of value-added chemicals", International Conference on “Waste Management”, Recycle-2016, Indian Institute of Technology Guwahati, Assam, India [2016]

7. A. S. Reshad, P. Tiwari, and V. V. Goud, "Thermochemical treatment of rubber seed for biofuels synthesis", 22nd International Congress of Chemical and Process Engineering CHISA 2016, Prague, Czech Republic [2016]

8. M. M. Reddy, P. Tiwari, and A. Singh, "Shear-induced particle migration in suspension of particles in power-law fluids", IITG – KIT Joint Symposium, Kyoto Institute of Technology, Japan [2016]

9. J. S. Rawat, P. Tiwari, and R. K. Upadhyay, "Investigation of gas-solid fluidized system with side injection using non-invasive based techniques and CFD simulation", CHISA PRES 2016, Prague,Czech Republic [2016]

10. P. Das and P. Tiwari, "Pyrolysis of three common plastics and optimization of process parameters targeting value added hydrocarbon products", Advanced Materials for Sustainable Applications, MRSI, NEIST-Jorhat, India [2016]

11. S. Reshad, V. V. Goud, and P. Tiwari, "Extraction of oil from rubber seeds for biodiesel application", Reflux 2014, Indian Institute of Technology Guwahati, India. [2016]

1. M. M. Reddy, P. Tiwari, and A. Singh, "Numerical simulation of concentrated suspension flow in 3D asymmetric T-junction bifurcating channel", Chemcon 2015, IIT Guwahati, India [2015]

2. P. Tiwari, "Degradation kinetic studies of biopolymers and composites", IITG-KIT joint symposium, IIT Guwahati, India [2015]

3. Sharma, R. Saha, S. Gogoi, R. Uppaluri, and P. Tiwari, "Experimental and simulation studies of chemical based enhanced oil recovery", IITG-ABB workshop, IIT Guwahati, India [2015]

4. R. Saha, R. V. S. Uppaluri, and P. Tiwari, "Experimental and simulation studies of chemical based enhanced oil recovery,", Reflux, IIT Guwahati, India [2015]

5. R. Saha, A. Sharma, S. Gogoi, R. Uppaluri, and P. Tiwari, "Chemical induced oil recovery for Assam crude oil", Chemcon 2015, IIT Guwahati, India [2015]

6. S. Reshad, P. Tiwari, and V. V. Goud, "Rubber seed oil methyl ester synthesis: A comparison study of non-conventional techniques using heterogeneous catalyst.", Chemcon 2015, IIT Guwahati, India. [2015]

7. S. Reshad, D. Panjiara, P. Tiwari, and V. V. Goud, "Methyl ester production from rubber seed oil using heterogeneous base catalyst: Process optimization", Reflux 2015, IIT Guwahati, India. [2015]

8. J. S. Rawat, R. K. Upadhyay, and P. Tiwari, "Comparison of spatial distribution of solid in nozzle assisted gas-solid fluidized bed", Chemcon 2015, IIT Guwahati, India [2015]

9. R. Phukan, P. Tiwari, and S. B. Gogoi, "Enhanced oil recovery by alkaline-surfactant-alternated-CO2 flooding", Chemcon 2015, IIT Guwahati, India. [2015]

10. S. B. Gogoi, K. Hazarika, R. Phukan, P. Tiwari, R. V. S. Uppaluri, and A. Rajbongshi, "Adsorption of chemicals on minerals during enhanced oil recovery processes", AIChE 2015, Salt Lake City, USA [2015]

11. P. Das and P. Tiwari, "Valorization of packaging waste plastic by pyrolysis process in an experimental and model based study", Chemcon 2015, IIT Guwahati, India [2015]

12. K. Anem and P. Tiwari, "Enhanced oil recovery by alkali- surfactant-polymer flooding", Chemcon 2015, IIT Guwahati, India [2015]

1. S. P. K. Vangala, P. K. Pentyala, P. Tiwari, and V. Katiyar, "Poly(furfuryl alcohol-co-lactic acid) copolymer based biothermosets", the Advances in Sustainable Polymers (ASP 14), IIT Guwahati, India [2014]

2. S. Reshad, D. Panjiara, P. Tiwari, and V. V. Goud, "Biodiesel production using hetrogeneous base catalyst: Process optimization", Chemcon 2014, Chandigarh, India [2014]

3. M. M. Reddy, P. Tiwari, and A. Singh, "Lattice Boltzmann simulation method for concentrated suspension", CompFlu 2014, JNCASR, Bangalore, India [2014]

4. M. Reddy, P. Tiwari, and A. Singh, "Petroleum reservoir simulation of two-phase flow", FMFP-2014, IIT Kanpur, India [2014]

5. J. S. Rawat, P. Tiwari, and R. K. Upadhyay, "Investigation of the material distribution of solids in gas-solid fluidized bed column with side wall nozzle assembly", Chemcon 2014, Chandigarh, India [2014]

6. J. S. Rawat, S. K. Baheshwar, H. J. Pant, K. T. Shenoy, P. Tiwari, and R. K. Upadhyay, "Experimental and numerical investigation of gas-solid fluidized bed with nozzle spray from side wall", CAMURE 2014, Lyon , France [2014]

7. P. Premsagar, S. Balyan, P. Tiwari, and R. K. Upadhyay, "Experimental and numerical investigation of underground coal gasification (ucg)", Chemcon 2014, Chandigarh, India [2014]

8. P. Das and P. Tiwari, "Experimental study of waste plastic pyrolysis", Chemcon 2014, Chandigarh, India [2014]

1. S. P. K. Vangala, P. Tiwari, and V. Katiyar, "Thermal degradation kinetics of biopolymers based composites", the Polymer Processing Society Asia/ Australia Conference (PPS 2013), Mumbai, India [2013]

2. S. Balyan, P. Tiwari, and R. K. Upadhyay, "Assessment of hydrogen production from underground coal gasification", Chemcon 2013, Mumbai, India [2013]

1. . Tiwari, M. Deo, C. N. Lin, and J. D. Miller, "Characterization of the oil shale core pore structure before and after pyrolysis", AIChE, AIChE, Salt Lakie City, USA [2012]

1. P. Tiwari and M. Deo, "Experimental analysis of multiscale oil shale pyrolysis", 31st Oil Shale Symposium, Colorado School of Mines, Colorado, USA [2011]

2. P. Tiwari, J. Bauman, and M. Deo, "Mathematical modeling of oil shale pyrolysis", 31st Oil Shale Symposium Colorado School of Mines, Colorado, USA [2011]

1. P. Tiwari and M. Deo, "Thermal processing (pyrolysis) of oil shale", Western unconventional conference, Salt Lake City, Utah, USA [2010]

2. P. Tiwari and M. Deo, "The effect of pressure on oil shale thermal retorting", 30th Oil Shale Symposium, Colorado School of Mines, Colorado, USA [2010]

3. P. Tiwari and M. Deo, "Thermal gravimetric-mass spectrometry analysis of oil shale,", AIChE Annual Meeting, Salt Lake City, USA [2010]

4. P. Mandalaparty, P. Tiwari, and M. Deo, "Spent shale formations: Potential source for co2 sequestration,", Oil Shale Symposium, Colorado School of Mines, Colorado, USA [2010]

5. C. L. Lin, J. Miller, C. H. Hsieh, P. Tiwari, and M. Deo, "Pore-scale analysis of oil shale pyrolysis by x-ray CT and LB simulations,", 6th World Congress on Industrial Process Tomography, Beijing ,China [2010]

6. R. L. Krumm, P. Tiwari, and M. Deo, "Effect of oil shale processing on water compositions", Western unconventional conference, Salt Lake City, Utah, USA [2010]

1. P. Tiwari, K. Oh, and M. Deo, "Oil shale pyrolysis: Characterization and compositional analyses", 29th Oil Shale Symposium Colorado School of Mines, Colorado, USA [2009]

2. C. L. Lin, J. Miller, C. H. Hsieh, P. Tiwari, and M. Deo, "Pore-scale analysis of pyrolyzed oil shale cores", 29th Oil Shale Symposium at Colorado School of Mines, Colorado, USA [2009]

1. M. Deo, C.-K. Huang, and P. Tiwari, "Modeling in-situ production of oil from oil shale", AIChE Annual Meeting, Philadelphia, USA [2008]

2. P. Tiwari, K. OH, and M. Deo, "Isothermal and non-isothermal kinetic analyses of mahogany oil shale with TGA", 28th Oil Shale Symposium, Colorado School of Mines, Colorado, USA [2008]

3. P. Tiwari and M. Deo, "Kinetics of oil shale pyrolysis and oil composition", AIChE Annual Meeting, Philadelphia, PA, USA [2008]

4. K. Oh, M. Jemmett, D. Johnson, P. Tiwari, J. Magda, and M. Deo, "Partial recovery of wax gel strength: Quantitative and qualitative analyses", AICHE Annual Meeting 2010, Conference Proceedings, Philadelphia, USA [2008]

5. K. Oh, K. Gandhi, P. Tiwari, and M. Deo, ""Yield behavior of wax gel formation in the presence of asphaltenes", AIChE Spring Meeting, New Orleans, USA [2008]

1. P. Tiwari, R. Kumar, and S. Garg, "Transesterification, modeling and simulation of batch kinetics of non-edible vegetable oils for biodiesel production", AIChE Annual Meeting, San Francisco, USA [2006]

1. Eds: Lalit Pandey and Pankaj Tiwari, "Microbial Enhanced Oil Recovery: Principles and Potential ", Springer, ISBN: 9789811654657 (2021)

2. Rahul Saha, Pankaj Tiwari, Ramgopal Uppaluri, "Chemical Nanofluids in Enhanced Oil Recovery: Fundamentals and Applications", CRC Press, ISBN: 9781003010937 (2021)

1. Pankaj Tiwari, Josh Staten and Milind Deo, "Core Scale Oil Shale Pyrolysis, Chapter 7", Utah Oil Shale: Science, Technology, and Policy Perspectives, Jennifer Spinti,CRC Press, Taylor & Francis Group , 978-1498721721, 978-1498721721 (2016)

2. Manjunath Reddy, Pankaj Tiwari and Anugrah Singh, "Petroleum reservoir simulation of two-phase flow in Fluid Mechanics and Fluid Power", Petroleum reservoir simulation of two-phase flow in Fluid Mechanics and Fluid Power,Contemporary Research, Springer , 9788132227410, 9788132227410 (2016)

3. Ali Shemsedin Reshad, Pankaj Tiwari and Vaibhav V. Goud, "Production of Biodiesel from Renewable Resources, Chapter 9", Biofuels: Production and Future Perspective,Ram Sarup Singh Ashok Pandey, Edgard Gnansounou, CRC Press, Taylor & Francis Group , 978-1498723596, 978-1498723596 (2016)

4. Sutapa Das, Ali S Reshad, Nilutpal Bhuyan, Debashis Sut, Pankaj Tiwari, Vaibhav V Goud, Rupam Kataki, , "Utilization of nonedible oilseeds in a biorefinery approach with special emphasis on rubber seeds", ,Waste Biorefinery (2020)

5. Ranjan Phukan, Subrata Borgohain Gogoi and Pankaj Tiwari, "Characterisation of Reservoir Rock and Fluids for CO2 Foam Enhanced Oil Recovery Application", Advances in Petroleum Technology,Jenny Stanford Publishing (2020)

6. Poulami Datta, Pankaj Tiwari, Lalit Mohan Pandey, "Microbial Biosurfactants: Remediation of Contaminated Soils", Biodegradation, Pollutants and Bioremediation Principles,CRC Press, Taylor & Francis Group (Accepted and in Press) (2021)