Alkali-thermal gasification and hydrogen generation potential of biomass

Abstract

Generating hydrogen gas from biomass is one approach to lowering dependencies on fossil fuels for energy and chemical feedstock, as well as reducing greenhouse gas emissions. Using both equilibrium simulations and batch experiments with NaOH as a model alkaline, this study established the technical feasibility of converting various biomasses (e.g., glucose, cellulose, xylan and lignin) into H₂-rich gas via catalyst-free, alkali-thermal gasification at moderate temperatures (as low as 300 °C). This process could produce more H₂ with less carbon-containing gases in the product than other comparable methods. It was shown that alkali-thermal gasification follows{\mathrm{C}}_x{\mathrm{H}}_y{\mathrm{O}}_z+\mathrm{2}x\mathrm{NaOH}+(x-z{\mathrm{)H}}_2\mathrm{O}= \mathrm{(2}x+y/\mathrm{2}-z{\mathrm{)H}}_2+x{\mathrm{Na}}_2{\mathrm{CO}}_3, with carbonate being the solid product which is different from the one suggested in the literature. Moreover, the concept of hydrogen generation potential (H₂-GP)—the maximum amount of H₂ that a biomass can yield, was introduced. For a given biomass C_xH_yO_z, the H₂-GP would be moles of H₂. It was demonstrated experimentally that the H₂-GP was achievable by adjusting the amounts of H₂O and NaOH, temperature and pressure.

Graphical abstract

Keywords

hydrogen generation potential / biomass / lignocellulose / alkali-thermal gasification / sodium hydroxide

References

[1] Ishida M, Otsuka  K, Takenaka S ,  Yamanaka I . One-step production of CO- and CO₂-free hydrogen from biomass. Journal of Chemical Technology and Biotechnology (Oxford, Oxfordshire), 2005, 80(3): 281–284

[2] EG&G Technical Services. I. In: Fuel Processing Techniques, Fuel Cell Handbook 7th ed. Morgantown: U.S. Department of Energy, 2004, 257–259

[3] Balat H, Kırtay  E. Hydrogen from biomass—Present scenario and future prospects. International Journal of Hydrogen Energy, 2010, 35(14): 7416–7426

[4] Kirtay E. Recent advances in production of hydrogen from biomass. Energy Conversion and Management, 2011, 52(4): 1778–1789

[5] Basu P, Mettanant  V. Biomass gasification in supercritical water—A review. International Journal of Chemical Reactor Engineering, 2009, 7(1): 1919

[6] Elliott D C. In hydrothermal processing. In: Brown R C, ed. Thermochemical Processing of Biomass: Conversion into Fuels, Chemicals and Power. West Sussex: Wiley, 2011, 200–231

[7] Schmieder H, Abeln  J, Boukis N ,  Dinjus E ,  Kruse A ,  Kluth M ,  Petrich G ,  Sadri E ,  Schacht M . Hydrothermal gasification of biomass and organic wastes. Journal of Supercritical Fluids, 2000, 17(2): 145–153

[8] Muangrat R, Onwudili  J A, Williams  P T. Alkali-promoted hydrothermal gasification of biomass food processing waste: A parametric study. International Journal of Hydrogen Energy, 2010, 35(14): 7405–7415

[9] Azadi P, Afif  E, Azadi F ,  Farnood R . Screening of nickel catalysts for selective hydrogen production using supercritical water gasification of glucose. Green Chemistry, 2012, 6(6): 1766–1777

[10] Gökkaya D S ,  Saglam M ,  Yuksel M ,  Ballice L . Hydrothermal gasification of xylose: Effects of reaction temperature, pressure, and K₂CO₃ as a catalyst on product distribution. Biomass and Bioenergy, 2016, 1: 26–36

[11] Kruse A. Supercritical water gasification. Biofuels, Bioproducts & Biorefining, 2008, 2(5): 415–437

[12] Ishida M, Takenaka  S, Yamanaka I ,  Otsuka K . Production of CO_x-free hydrogen from biomass and NaOH mixture: Effect of catalysts. Energy & Fuels, 2006, 20(2): 748–753

[13] Nzihou A, Stanmore  B, Sharrock P . A review of catalysts for the gasification of biomass char, with some reference to coal. Energy, 2013, 58(1): 305–317

[14] Tchapda A H, Pisupati  S V. A review of thermal co-conversion of coal and biomass/waste. Energies, 2014, 7(3): 1098–1148

[15] Zhang Z, Pang  S, Levi T . Influence of AAEM species in coal and biomass on steam co-gasification of chars of blended coal and biomass. Renewable Energy, 2017, 1: 356–363

[16] Liu X, Xiong  B, Huang X ,  Ding H, Zheng  Y, Liu Z ,  Zheng C . Effect of catalysts on char structural evolution during hydrogasification under high pressure. Fuel, 2017, 88(15): 474–482

[17] Guan G, Kaewpanha  M, Hao X ,  Abudula A . Catalytic steam reforming of biomass tar: Prospects and challenges. Renewable & Sustainable Energy Reviews, 2016, 58: 450–461

[18] Yan Q, Guo  L, Lu Y . Thermodynamic analysis of hydrogen production from biomass gasification in supercritical water. Energy Conversion and Management, 2006, 47(11-12): 1515–1528

[19] Smith W R, Missen  R W. In Chemical Thermodynamics and Equilibrium Conditions; Chemical Reaction Equilibrium Analysis: Theory and Algorithms. Hoboken: John Wiley & Sons, 1982, 40–60

[20] Lee I, Kim  M, Ihm S . Gasification of glucose in supercritical water. Industrial & Engineering Chemistry Research, 2002, 41(5): 1182–1188

[21] Phongkanpai V, Benjakul  S, Tanaka M . Effect of pH on antiocidative activity and other characteristics of caramelization products. Journal of Food Biochemistry, 2006, 30(2): 174–186

[22] Onwudili J A, Williams  P T. Role of sodium hydroxide in the production of hydrogen gas from the hydrothermal gasification of biomass. International Journal of Hydrogen Energy, 2009, 34(14): 5645–5656

[23] Lewis R. In Sodium Hydroxide; Hawley’s Condensed Chemical Dictionary. 15th ed. Hoboken: John Wiley & Sons, 2007, 1146

[24] Kamo T, Takaoka  K, Otomo J ,  Takahashi H . Effect of steam and sodium hydroxide for the production of hydrogen on gasification of dehydrochlorinated poly(vinyl chloride). Fuel, 2006, 85(7-8): 1052–1059

[25] Araki K, Yamaguchi  Y, Tsutsumi A ,  Fushimi C . Effect of heating rate on steam gasification of biomass. 2. Thermogravimetric-mass spectrometric (TG-MS) analysis of gas evolution. Industrial & Engineering Chemistry Research, 2003, 42(17): 3929–3936

[26] Azadi P, Syed  K M, Farnood  R. Catalytic gasification of biomass model compound in near-critical water. Applied Catalyst A, 2009, 358(1): 65–72

[27] Widyawati M, Church  T L, Florin  N H, Harris  A T. Hydrogen synthesis from biomass pyrolysis with in situ carbon dioxide capture using calcium oxide. International Journal of Hydrogen Energy, 2011, 36(8): 4800–4813

[28] Wen G, Xu  Y, Xu Z ,  Tian Z. Direct conversion of cellulose into hydrogen by aqueous-phase reforming process. Catalysis Communications, 2010, 11(6): 522–526

[29] Zheng C, Lee  D H, Yang  H, Chen H ,  Yan R, Liang  D T. In-depth investigation of biomass pyrolysis based on three major components: Hemicellulose, cellulose and lignin. Energy & Fuels, 2005, 20: 388–393

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