CuZn-based catalyst is an attractive catalyst for methanol synthesis from CO_(2)hydrogenation,but it early deactivates and its methanol yield still needs to improve.In this study,Y_(2)O_(3)was introduced to Cu/ZnO usi...CuZn-based catalyst is an attractive catalyst for methanol synthesis from CO_(2)hydrogenation,but it early deactivates and its methanol yield still needs to improve.In this study,Y_(2)O_(3)was introduced to Cu/ZnO using a one-pot hydrothermal method,and exhibits a synergistic effect of ZnO and Y_(2)O_(3)on enhancing methanol yield and the stability.We found that the interaction between Y_(2)O_(3)and ZnO results in abundant oxygen vacancies formation,thereby enhancing CO_(2)adsorption and activation.Kinetic analysis and in situ DRIFTS suggest that RWGS forming CO and methanol formation compete for a mutual intermediate HCOO^(*),and the introduction of Y_(2)O_(3)to Cu/ZnO raises the energy barrier for the CO formation but lowers that for methanol formation,thus enhancing the methanol yield on Cu/ZnO/Y_(2)O_(3).展开更多
针对传统煤热解工艺焦油产率低、品质差的问题,采用甲醇水蒸气重整(SRM)与煤热解(CP)耦合的新工艺,研究了热解气氛、热解温度、水醇流量等因素在CP-SRM耦合过程中对热解产物分布的影响规律,分析了CP-SRM耦合过程的反应机理。研究结果表...针对传统煤热解工艺焦油产率低、品质差的问题,采用甲醇水蒸气重整(SRM)与煤热解(CP)耦合的新工艺,研究了热解气氛、热解温度、水醇流量等因素在CP-SRM耦合过程中对热解产物分布的影响规律,分析了CP-SRM耦合过程的反应机理。研究结果表明:在热解温度550℃、水醇流量300 m L/min时,耦合过程焦油产率最高达16.1%,比相同温度、相同流量时N2、H2气氛下分别高出78.9%、24.8%。焦油中苯、酚、萘菲蒽(NPA)含量比N2气氛下分别高出64.0%、26.7%、31.4%,比H2气氛下分别高出20.6%、12.7%、17.8%。进一步证实了CP-SRM耦合过程不仅可以提高焦油产率,而且能够提升焦油品质。展开更多
Circulating entrained bed reactor has many good characteristics as follows: good mass transfer, good solid suspending, little axial backmixing, sufficient contact of different phase, wide adjustable range of gas-liqui...Circulating entrained bed reactor has many good characteristics as follows: good mass transfer, good solid suspending, little axial backmixing, sufficient contact of different phase, wide adjustable range of gas-liquid ratio and high efficiency of catalyst. Study on methanol synthesis has been carried out in the hot model experimental apparatus, and the effects of these factors such as slurry recirculation flow rate,space velocity,concentration of catalyst, the number of nozzle on the methanol synthesis has been investigated in the present study. The results show that the outlet product concentration and space-time yield increase with slurry recirculation flow rate, concentration of catalyst and the number of nozzle. High space velocity of syngas enhanced the space-time yield of catalyst,but decreased the outlet product concentration.展开更多
文摘CuZn-based catalyst is an attractive catalyst for methanol synthesis from CO_(2)hydrogenation,but it early deactivates and its methanol yield still needs to improve.In this study,Y_(2)O_(3)was introduced to Cu/ZnO using a one-pot hydrothermal method,and exhibits a synergistic effect of ZnO and Y_(2)O_(3)on enhancing methanol yield and the stability.We found that the interaction between Y_(2)O_(3)and ZnO results in abundant oxygen vacancies formation,thereby enhancing CO_(2)adsorption and activation.Kinetic analysis and in situ DRIFTS suggest that RWGS forming CO and methanol formation compete for a mutual intermediate HCOO^(*),and the introduction of Y_(2)O_(3)to Cu/ZnO raises the energy barrier for the CO formation but lowers that for methanol formation,thus enhancing the methanol yield on Cu/ZnO/Y_(2)O_(3).
文摘针对传统煤热解工艺焦油产率低、品质差的问题,采用甲醇水蒸气重整(SRM)与煤热解(CP)耦合的新工艺,研究了热解气氛、热解温度、水醇流量等因素在CP-SRM耦合过程中对热解产物分布的影响规律,分析了CP-SRM耦合过程的反应机理。研究结果表明:在热解温度550℃、水醇流量300 m L/min时,耦合过程焦油产率最高达16.1%,比相同温度、相同流量时N2、H2气氛下分别高出78.9%、24.8%。焦油中苯、酚、萘菲蒽(NPA)含量比N2气氛下分别高出64.0%、26.7%、31.4%,比H2气氛下分别高出20.6%、12.7%、17.8%。进一步证实了CP-SRM耦合过程不仅可以提高焦油产率,而且能够提升焦油品质。
基金supported by the National Key Research and Development Program of China(2020YFB0606404)National Natural Science Foundation of China(21991092,22272195,U2003123,U1910203).
文摘Circulating entrained bed reactor has many good characteristics as follows: good mass transfer, good solid suspending, little axial backmixing, sufficient contact of different phase, wide adjustable range of gas-liquid ratio and high efficiency of catalyst. Study on methanol synthesis has been carried out in the hot model experimental apparatus, and the effects of these factors such as slurry recirculation flow rate,space velocity,concentration of catalyst, the number of nozzle on the methanol synthesis has been investigated in the present study. The results show that the outlet product concentration and space-time yield increase with slurry recirculation flow rate, concentration of catalyst and the number of nozzle. High space velocity of syngas enhanced the space-time yield of catalyst,but decreased the outlet product concentration.
