The sorption-enhanced steam reforming process of methanol（SESRP-Me OH） to produce high-purity H2 was thermodynamically and experimentally studied.Thermodynamic calculations showed that at a CO2 adsorption ratio of 9...The sorption-enhanced steam reforming process of methanol（SESRP-Me OH） to produce high-purity H2 was thermodynamically and experimentally studied.Thermodynamic calculations showed that at a CO2 adsorption ratio of 95%,product gas contains 98.36% H2,32.8 ppm CO under temperature of 130°C and steam-to-methanol（S/M） molar ratio of 2.However,without adsorption-enhanced,the product gas contains nearly 74.99% H2 with 24.96% CO2 and 525 ppm CO.To verify the thermodynamic calculation results,experiments were performed in a fixed-bed reactor loaded with commercial Cu O/Zn O/Al2O3 methanol reforming catalyst and 22% K2CO3-promoted hydrotalcite as CO2 adsorbent.Experimental results showed that 99.61% H2 could be obtained by SESRP-Me OH at reaction temperature of 230°C and S/M of 2.Under the same CH3 OH conversion,the reaction temperature decreased by almost 50°C and H2 concentration increased of more than 20%using SESRP-Me OH compared with solely steam reforming of methanol.The characterization of the adsorbent and catalyst showed that the adsorbent showed good stability while the catalyst was seriously sintered under the high regeneration temperature of the adsorbent.展开更多
Hydrogen is an indispensable energy carrier for the sustainable development of human society.Nevertheless,its storage,transportation,and in situ generation still face significant challenges.Methanol can be used as an ...Hydrogen is an indispensable energy carrier for the sustainable development of human society.Nevertheless,its storage,transportation,and in situ generation still face significant challenges.Methanol can be used as an intermediate carrier for hydrogen supplies,providing hydrogen energy through instant methanol conversion.In this study,a sorption-enhanced,chemical-looping,oxidative steam methanol-reforming(SECLOSRM)process is proposed using CuO–MgO for the on-board hydrogen supply,which could be a promising method for safe and efficient hydrogen production.Aspen Plus software was used for feasibility verification and parameter optimization of the SECL-OSRM process.The effects of CuO/CH_(3)OH,MgO/CH_(3)OH,and H_(2)O/CH_(3)OH mole ratios and of temperature on H_(2)production rate,H utilization efficiency,CH_(3)OH conversion,CO concentration,and system heat balance are discussed thoroughly.The results indicate that the system can be operated in autothermal conditions with high-purity hydrogen(99.50 vol%)and ultra-low-concentration CO(<50 ppm)generation,which confirms the possibility of integrating low-temperature proton-exchange membrane fuel cells(LT-PEFMCs)with the SECL-OSRM process.The simulation results indicate that the CO can be modulated in a lower concentration by reducing the temperature and by improving the H_(2)O/CH_(3)OH and MgO/CH_(3)OH mole ratios.展开更多
文摘The sorption-enhanced steam reforming process of methanol（SESRP-Me OH） to produce high-purity H2 was thermodynamically and experimentally studied.Thermodynamic calculations showed that at a CO2 adsorption ratio of 95%,product gas contains 98.36% H2,32.8 ppm CO under temperature of 130°C and steam-to-methanol（S/M） molar ratio of 2.However,without adsorption-enhanced,the product gas contains nearly 74.99% H2 with 24.96% CO2 and 525 ppm CO.To verify the thermodynamic calculation results,experiments were performed in a fixed-bed reactor loaded with commercial Cu O/Zn O/Al2O3 methanol reforming catalyst and 22% K2CO3-promoted hydrotalcite as CO2 adsorbent.Experimental results showed that 99.61% H2 could be obtained by SESRP-Me OH at reaction temperature of 230°C and S/M of 2.Under the same CH3 OH conversion,the reaction temperature decreased by almost 50°C and H2 concentration increased of more than 20%using SESRP-Me OH compared with solely steam reforming of methanol.The characterization of the adsorbent and catalyst showed that the adsorbent showed good stability while the catalyst was seriously sintered under the high regeneration temperature of the adsorbent.
基金supported by the National Key R&D Program of China(2018YFE0111100)National Natural Science Foundation of China(52106193,21908162)+2 种基金the Natural Science Foundation of Hunan Province(2021JJ40756)the Science and Technology Innovation Program of Hunan Province(2020GK2070)the Innovation-Driven Project of Central South University(2020CX008)
文摘Hydrogen is an indispensable energy carrier for the sustainable development of human society.Nevertheless,its storage,transportation,and in situ generation still face significant challenges.Methanol can be used as an intermediate carrier for hydrogen supplies,providing hydrogen energy through instant methanol conversion.In this study,a sorption-enhanced,chemical-looping,oxidative steam methanol-reforming(SECLOSRM)process is proposed using CuO–MgO for the on-board hydrogen supply,which could be a promising method for safe and efficient hydrogen production.Aspen Plus software was used for feasibility verification and parameter optimization of the SECL-OSRM process.The effects of CuO/CH_(3)OH,MgO/CH_(3)OH,and H_(2)O/CH_(3)OH mole ratios and of temperature on H_(2)production rate,H utilization efficiency,CH_(3)OH conversion,CO concentration,and system heat balance are discussed thoroughly.The results indicate that the system can be operated in autothermal conditions with high-purity hydrogen(99.50 vol%)and ultra-low-concentration CO(<50 ppm)generation,which confirms the possibility of integrating low-temperature proton-exchange membrane fuel cells(LT-PEFMCs)with the SECL-OSRM process.The simulation results indicate that the CO can be modulated in a lower concentration by reducing the temperature and by improving the H_(2)O/CH_(3)OH and MgO/CH_(3)OH mole ratios.
