Selected publications: downloadable versions

●     G. Várhegyi.  Problems with the determination of activation energy as function of the reacted fraction from thermoanalytical experiments.  J. Therm. Anal. Calorim. 2023, 148, 12835-12843 doi: 10.1007/s10973-023-12559-6  Supplementary Information
Open access publication:  2023_E(alpha)_compensation_effects.pdf
Supporting information:  2023_Supplementary_material_to_E(alpha)_compensation_effects.zip

●     Várhegyi, G.; Wang, L.; Skreiberg, Ø. Kinetics of the CO2 gasification of woods, torrefied woods, and wood chars. Least squares evaluations by empirical models. J. Therm. Anal. Calorim. 2023, 148, 6439-6450.  doi: 10.1007/s10973-023-12151-y  Supplementary Information 
Open access publication:  2023_CO2_gasification_torrefied_woods.pdf
Supporting information:  2023_Supplementary_info_to_CO2_gasification.pdf

●     Várhegyi, G.; Wang, L.; Skreiberg, Ø.  Empirical kinetic models for the CO2 gasification of biomass chars.  Part 1. Gasification of wood chars and forest residue chars.  ACS Omega 2021, 6, 27552-27560.  doi: 10.1021/acsomega.1c04577
Open access publication:  2021_Char+CO2_empirical_models.pdf
Supporting information:  2021_Supporting_info_to_Char+CO2.pdf

●     Várhegyi, G.; Wang, L.; Skreiberg, Ø.  Empirical kinetic models for the combustion of charcoals and biomasses in the kinetic regime.  Energy Fuels 2020, 34, 16302-16309
doi: 10.1007/s10973-019-09162-z
Open access publication:  2020_Biomass_char+O2_empirical_models.pdf
Supporting information:  2020_Supporting_info_to_Biomass_char+O2.pdf

●     Várhegyi, G.; Wang, L.; Skreiberg, Ø.  Non-isothermal kinetics: best-fitting empirical models instead of model-free methods. J Therm Anal Calorim 2020, 142, 1043-1054  doi: 10.1007/s10973-019-09162-z
Open access publication:  2020_Best-fitting_empirical_models.pdf
Supporting information:  2020_Supplement_to_Best-fitting_empirical_models.pdf

●     Várhegyi, G.  Empirical models with constant and variable activation energy for biomass pyrolysis.  Energy Fuels 2019, 33, 2348-2358.  doi: 10.1021/acs.energyfuels.9b00040
Open access publication:  2019_Empirical_models_for_biomass_pyrolysis.pdf
Supporting information:  2019_Supporting_info_Empirical_models_for_biomass_pyrolysis.pdf

●     Wang, L.; Li, T.; Várhegyi, G.; Skreiberg, Ø.; Løvås, T.  CO2 Gasification of chars prepared by fast and slow pyrolysis from wood and forest residue. A kinetic study.  Energy Fuels 2018, 32, 588-597.  doi: 10.1021/acs.energyfuels.7b03333
Manuscript:  2018_Char+CO2_kinetics.pdf

●     Várhegyi, G.; Wang, L.; Skreiberg, Ø.  Towards a meaningful non-isothermal kinetics for biomass materials and other complex organic samples  J. Therm. Anal. Calorim.  2018, 133, 703-712.  doi: 10.1007/s10973-017-6893-0
Manuscript:  2018_Towards_meaningful_non-isothermal_kinetics.pdf

●     Barta-Rajnai, E.; Várhegyi, G.; Wang, L.; Skreiberg, Ø.; Grønli, M.; Czégény, Zs.  Thermal decomposition kinetics of wood and bark and their torrefied products.  Energy Fuels 2017, 31, 4024-4034.  doi: 10.1021/acs.energyfuels.6b03419
Manuscript:  2017_Kinetics_wood_bark_torrefied_products.pdf
Supporting information:  2017_Supporting_info_Kinetics_wood_bark_torrefied_products.pdf

●     Várhegyi, G.: In Honor of Michael J. Antal.  Energy Fuels 2016, 30, 7809-7810.  doi: 10.1021/acs.energyfuels.6b02476
Manuscript:  2016_In_honor_of_Michael_J_Antal.pdf

●     Várhegyi, G.: From “sirups” to biocarbons. A 30 year cooperation research for better biomass utilization with Michael J. Antal, Jr.  Energy Fuels 2016, 30, 7887-7895.  doi: 10.1021/acs.energyfuels.6b00860
Manuscript: 2016_30-years_for_better_biomass_utilization.pdf
Lecture version:  2016_lecture_30years_kinetics.pdf

●     Wang, L.; Várhegyi, G.; Skreiberg, Ø.; Li, T.; Grønli, M.; Antal, M. J.: Combustion characteristics of biomass charcoals produced at different carbonization conditions.  A kinetic study.  Energy Fuels 2016, 30, 3186-3197. doi: 10.1021/acs.energyfuels.6b00354
Manuscript:  2016_Combustion_characteristics_biomass_charcoals.pdf
Supporting info:  2016_Combustion_characteristics_biomass_charcoals_Supporting_Information.pdf

●     Wang, L.; Várhegyi, G.; Skreiberg, Ø.:  CO2 Gasification of torrefied wood.  A kinetic study.  Energy Fuels 2014, 28, 7582-7590. doi: 10.1021/ef502308e
Manuscript:   2014_Torrefied_wood+CO2.pdf
Supporting info:  2014_Torrefied_wood+CO2_Supporting_Information.pdf

●     Tapasvi, D.;  Khalil, R.; Várhegyi, G.;  Tran, K.-Q.; Grønli, M.; Skreiberg, Ø.: Thermal decomposition kinetics of woods with an emphasis on torrefaction.  Energy Fuels 2013, 27, 6134-6145. doi: 10.1021/ef4016075
Manuscript:  2013_Thermal_decomposition_kinetics_of_woods__Torrefaction.pdf

●     Wang, L.; Sandquist, J.; Várhegyi, G.; Matas Güell, B.: CO2 Gasification of Chars Prepared from Wood and Forest Residue. A Kinetic Study.  Energy Fuels 2013, 27, 6098-6107. doi: 10.1021/ef401118f
Manuscript:  2013_CO2_gasification_of_chars_from_wood_and_forest_residue.pdf

●     Tapasvi, D.; Khalil, R.; Várhegyi, G.; Skreiberg, Ø.; Tran, K.-Q.; Grønli, M.: Kinetic behavior of torrefied biomass in an oxidative environment.  Energy Fuels 2013, 27, 1050-1060.  doi: 10.1021/ef3019222
Manuscript:  2013_Torrefied_biomass+O2.pdf
Supporting info:  2013_Torrefied_biomass+O2_Supporting_Information.pdf

●     Trninić, M.; Wang, L.; Várhegyi, G.; Grønli, M.; Skreiberg, Ø.: Kinetics of corncob pyrolysis.  Energy Fuels 2012, 26, 2005-2013.  doi: 10.1021/ef3002668
Manuscript:  2012_Kinetics_of_corncob_pyrolysis.pdf

●     Várhegyi, G.; Sebestyén, Z.; Czégény, Z.; Lezsovits, F.; Könczöl, S.:  Combustion kinetics of biomass materials in the kinetic regime.  Energy Fuels 2012, 26, 1323-1335.  doi: 10.1021/ef201497k
Manuscript:  2012_Combustion_kinetics_of_biomass_materials.pdf
Supporting info:  2012_Combustion_kinetics_Supporting_Information.pdf

●     Várhegyi, G.; Bobály, B.; Jakab, E.; Chen, H.:  Thermogravimetric study of biomass pyrolysis kinetics. A distributed activation energy model with prediction tests.  Energy Fuels 2011, 25, 24-32.  doi: 10.1021/ef101079r
Manuscript:  2011_TGA_study_of_biomass_pyrolysis_kinetics__DAEM_with_prediction_tests.pdf
Supporting info:  2011_TGA_study_of_biomass_pyrolysis_kinetics__Supporting_Information.pdf

●     Várhegyi, G.; Czégény, Zs.; Liu, C.; McAdam, K.:  Thermogravimetric analysis of tobacco combustion assuming DAEM devolatilization and empirical char-burnoff kinetics.  Ind. Eng. Chem. Res. 2010, 49, 1591-1599.  doi: 10.1021/ie901180d
Manuscript:  2010_TGA_study_of_tobacco_combustion_assuming_DAEM_devolatilization.pdf
Supporting info:  2010_TGA_study_of_tobacco_combustion_Supporting_Information.pdf

●     Várhegyi, G.; Chen, H.; Godoy, S.:  Thermal decomposition of wheat, oat, barley and Brassica carinata straws.  A kinetic study.  Energy Fuels 2009, 23, 646-652.  doi: 10.1021/ef800868k
Manuscript:  2009_TGA_Kinetics_of_Straws.pdf
Supporing info:  2009_TGA_Kinetics_of_Straws_Supporting_Information.pdf

●     Khalil, R.; Várhegyi, G.; Jäschke, S.; Grønli, M. G.; Hustad, J.:  CO2 gasification of biomass chars.  A kinetic study.  Energy Fuels 2009, 23, 94-100.  doi: 10.1021/ef800739m
Manuscript:  2009_CO2_gasification_of_biomass_chars__A_kinetic_study.pdf

●     Várhegyi, G.; Czégény, Zs.; Jakab, E.; McAdam, K.; Liu, C.:  Tobacco pyrolysis.  Kinetic evaluation of thermogravimetric – mass spectrometric experiments.  J. Anal. Appl. Pyrolysis 2009, 86, 310-322.  doi: 10.1016/j.jaap.2009.08.008
Manuscript:  2009_Tobacco_pyrolysis__Kinetic_evaluation_of_TG-MS_experiments.pdf
Supplementary content:  2009_Tobacco_pyrolysis__Supplementary_Content.pdf

●     Wu, M.; Várhegyi, G.; Zha Q.:  Kinetics of cellulose pyrolysis after a pressurized heat treatment.  Thermochim. Acta 2009, 496, 59-65.  doi: 10.1016/j.tca.2009.06.024
Manuscript:  2009_Kinetics_of_cellulose_pyrolysis_after_pressurized_heat_treatment.pdf

●     Becidan, M.; Várhegyi, G.; Hustad, J. E.; Skreiberg, Ø.:  Thermal decomposition of biomass wastes. A kinetic study.  Ind. Eng. Chem. Res. 2007, 46, 2428-2437.  doi: 10.1021/ie061468z
Manuscript:  2007_Thermal_decomposition_of_biomass_wastes__A_kinetic_study.pdf

●     Várhegyi, G.:  Aims and methods in non-isothermal reaction kinetics.  J. Anal. Appl. Pyrolysis  2007, 79, 278-288.  doi: 10.1016/j.jaap.2007.01.007
Manuscript:  2007_Aims_and_methods_in_non-isothermal_reaction_kinetics.pdf

●     Várhegyi, G.; Mészáros, E.; Antal, M. J., Jr.; Bourke, J.; Jakab, E.:  Combustion kinetics of corncob charcoal and partially demineralized corncob charcoal in the kinetic regime.  Ind. Eng. Chem. Res. 2006, 45, 4962-4970.  doi: 10.1021/ie0602411  https://real.mtak.hu/21611/
Manuscript:  2006_Kinetics_of_charcoal_combustion.pdf

●     Mészáros, E.; Várhegyi, G.; Jakab, E.; Marosvölgyi, B.:  Thermogravimetric and reaction kinetic analysis of biomass samples from an energy plantation.  Energy Fuels 2004, 18, 497-507.  doi: 10.1021/ef034030%2B  https://real.mtak.hu/8896/
Manuscript:  2004_TGA_kinetics_of_energy_plantation_products.pdf

●     Várhegyi, G.; Grønli, M. G.; Di Blasi, C.:  Effects of sample origin, extraction and hot water washing on the devolatilization kinetics of chestnut wood.  Ind. Eng. Chem. Res. 2004, 43, 2356-2367.  doi: 10.1021/ie034168f  https://real.mtak.hu/21620/
Manuscript:  2004_Effects_of_extraction_and_hot_water_washing_on_devolatilization_kinetics_of_chestnut_wood.pdf

●     Várhegyi, G.; Szabó, P.; Antal, M. J., Jr.:  Kinetics of charcoal devolatilization.  Energy Fuels 2002, 16, 724-731.  doi: 10.1021/ef010227v  https://real.mtak.hu/21609/
Manuscript:  2002_Kinetics_of_charcoal_devolatilization.pdf

●     Tam, M. S.; Antal, M. J., Jr.; Jakab, E.; Várhegyi, G.:  Activated carbon from macadamia nut shell by air oxidation in boiling water.  Ind. Eng. Chem. Res. 2001, 40, 578-588.  doi: 10.1021/ie000461t
Manuscript:

●     Várhegyi, G.; Szabó, P.; Jakab, E.; Till, F.:  Least squares criteria for the kinetic evaluation of thermoanalytical experiments.  Examples from a char reactivity study.  J. Anal. Appl. Pyrolysis 2001, 57, 203-222.  doi: 10.1016/S0165-2370(00)00113-3  https://real.mtak.hu/21817/
Manuscript:  2001_Least_squares_criteria_for_kinetic_evaluation_of_thermoanalytical_experiments.pdf

●     Várhegyi, G.; Till, F.:  Comparison of temperature programmed char combustion in CO2 - O2 and Ar - O2 mixtures at elevated pressure.  Energy Fuels 1999, 13, 539-540.  doi: 10.1021/ef980159l  https://real.mtak.hu/21606/
Manuscript:  1999_Study_of_char_combustion_by_high_pressure_TGA.pdf

●     Grønli, M.; Antal, M. J., Jr.; Várhegyi, G.:  A round-robin study of cellulose pyrolysis kinetics by thermogravimetry.  Ind. Eng. Chem. Res. 1999, 38, 2238-2244.  doi: 10.1021/ie980601n  https://real.mtak.hu/21677/
Manuscript:  1999_Round-robin_study_of_cellulose_pyrolysis_kinetics.pdf

●     Várhegyi, G.; Till, F.:  Computer processing of thermogravimetric - mass spectrometric and high pressure thermogravimetric data.  Part 1.  Smoothing and differentiation.  Thermochim. Acta 1999, 329, 141-145.  doi: 10.1016/S0040-6031(99)00041-6  https://real.mtak.hu/21819/
Manuscript:  1999_Smoothing_and_differentiation_for_TGA_and_TGA-MS.pdf

●     Várhegyi, G.; Szabó, P.; Till, F.; Zelei, B.;  Antal, M. J., Jr.; Dai X.:  TG, TG-MS and FTIR characterization of high-yield biomass charcoals.  Energy Fuels 1998, 12, 969-974.  doi: 10.1021/ef9800359https://real.mtak.hu/21607/
Manuscript:  1998_TG-MS_study_of_biomass_charcoals.pdf

●     Antal, M. J., Jr.; Várhegyi, G.; Jakab, E.:  Cellulose pyrolysis kinetics:  Revisited.  Ind. Eng. Chem. Res. 1998, 37, 1267-1275.  doi: 10.1021/ie970144v  https://real.mtak.hu/21646/
Manuscript:  1998_Cellulose_pyrolysis_kinetics_revisited.pdf

●     Antal, M. J., Jr.; Várhegyi, G.:  Impact of systematic errors on the determination of cellulose pyrolysis kinetics.  Energy Fuels 1997, 11, 1309-1310.  doi: 10.1021/ef970030whttps://real.mtak.hu/21641/
Manuscript:  1997_Systematic_errors_and_cellulose_pyrolysis_kinetics.pdf

●     Várhegyi, G.; Antal, M. J., Jr.; Jakab, E. , Szabó, P.:  Kinetic modeling of biomass pyrolysis.  J. Anal. Appl. Pyrolysis 1997, 42, 73-87.  doi: 10.1016/S0165-2370(96)00971-0https://real.mtak.hu/21688/
Manuscript:  1997_Biomass_pyrolysis_kinetics.pdf

●     Várhegyi, G.; Szabó, P.; Jakab, E.; Till, F.; Richard J-R.:  Mathematical modeling of char reactivity in Ar-O2 and CO2-O2 mixtures.  Energy Fuels 1996, 10, 1208-1214.  doi: 10.1021/ef950252zhttps://real.mtak.hu/21604/
Manuscript:  1996_Char_combustion_kinetics.pdf

●     Várhegyi, G.; Antal, M. J., Jr.; Szabó, P.; Jakab, E.; Till, F.:  Application of complex reaction kinetic models in thermal analysis.  The least squares evaluation of series of experiments.  J. Thermal Anal. 1996, 47, 535-542.  doi: 10.1007/BF01983995https://real.mtak.hu/21807/
Manuscript:  1996_Complex_kinetic_models_in_thermal_analysis.pdf

●     Várhegyi, G.; Szabó, P.; Antal, M. J., Jr.:  Reaction kinetics of the thermal decomposition of cellulose and hemicellulose in biomass materials.  In Advances in Thermochemical Biomass Conversion (Ed. by A. V. Bridgwater), Volume 2, Blackie Academic and Professional, London, pp. 760-771, 1994, doi: 10.1007/978-94-011-1336-6_59https://real.mtak.hu/22240/
Manuscript:  1994_Kinetics_of_thermal_decomposition_in_biomass.pdf

●     Várhegyi, G.; Szabó, P.; Antal, M. J., Jr.:  Kinetics of the thermal decomposition of cellulose under the experimental conditions of thermal analysis.  Theoretical extrapolations to high heating rates.  Biomass Bioenergy 1994, 7, 69-74.  doi: 10.1016/0961-9534(95)92631-Hhttps://real.mtak.hu/22239/
Manuscript:  1994_Cellulose_kinetics_with_extrapolations.pdf

●     Várhegyi, G.; Jakab, E.; Antal, M. J., Jr.:  Is the Broido - Shafizadeh model for cellulose pyrolysis true?  Energy Fuels 1994, 8, 1345-1352.  doi: 10.1021/ef00048a025https://real.mtak.hu/21779/
Manuscript:  1994_Broido-type_kinetics_for_cellulose.pdf

●     Várhegyi, G.; Szabó, P.; Mok, W. S. L.; Antal, M. J., Jr.:  Kinetics of the thermal decomposition of cellulose in sealed vessels at elevated pressures. Effects of the presence of water on the reaction mechanism.  J. Anal. Appl. Pyrolysis 1993, 26, 159-174.  doi: 10.1016/0165-2370(93)80064-7https://real.mtak.hu/21700/
Manuscript:  1993_Cellulose_at_eleveted_pressure__kinetics.pdf

 

Further downloadable info:  a complete list of the independent citations to our works as extracted from the Hungarian National Scientific Bibliography (MTMT) at 9 January 2018 (html, pdf).