采用完全液相法制备了Cu-Zn-S i-A l浆状二甲醚合成催化剂,分析研究了其在浆态床合成气一步法合成二甲醚过程中的失活现象和机理.采用X射线粉末衍射、N2吸附测试、X射线光电子能谱以及元素分析等表征方法对催化剂使用前后的变化情况进...采用完全液相法制备了Cu-Zn-S i-A l浆状二甲醚合成催化剂,分析研究了其在浆态床合成气一步法合成二甲醚过程中的失活现象和机理.采用X射线粉末衍射、N2吸附测试、X射线光电子能谱以及元素分析等表征方法对催化剂使用前后的变化情况进行了分析.结果表明,完全液相法制备的Cu-Zn-S i-A l浆状催化剂的失活与传统方法制备的催化剂不尽相同,没有发现催化剂Cu晶粒的长大和比表面积降低等失活因素;催化剂失活与S i的存在有关,Cu组分的流失是其失活的主要原因.展开更多
A series of CuZnAl slurry catalysts were prepared by the complete liquid-phase technology.The influence of heat treatment atmospheres with different proportions of CO2 on the performance was investigated and the catal...A series of CuZnAl slurry catalysts were prepared by the complete liquid-phase technology.The influence of heat treatment atmospheres with different proportions of CO2 on the performance was investigated and the catalysts were characterized by TPR,BET,XRD and XPS.The results show that introduction of CO2 into heat treatment atmosphere influences obviously on the structure of catalysts before reaction but less on that of the ones after reaction.The reason is under the conditions of reaction,the bulk structure,pore structure and surface state will voluntarily go to same.The heat treatment atmosphere with different content of CO2 influences obviously on the reductive performance of the catalysts,low reductive temperature is corresponding to high DME space-time yield and right amount of Cu metal and Cu2O to high CO conversion.The introduction of CO2 into heat treatment atmosphere restrains the water-gas shift reaction,raising the DME selectivity.The proper amount of CO2 in the heat treatment atmosphere can result in the increase of DME space-time yield.In this work,when the content of CO2 in the heat treatment atmospheres is 50%,the performance of catalysts is best.展开更多
文摘采用完全液相法制备了Cu-Zn-S i-A l浆状二甲醚合成催化剂,分析研究了其在浆态床合成气一步法合成二甲醚过程中的失活现象和机理.采用X射线粉末衍射、N2吸附测试、X射线光电子能谱以及元素分析等表征方法对催化剂使用前后的变化情况进行了分析.结果表明,完全液相法制备的Cu-Zn-S i-A l浆状催化剂的失活与传统方法制备的催化剂不尽相同,没有发现催化剂Cu晶粒的长大和比表面积降低等失活因素;催化剂失活与S i的存在有关,Cu组分的流失是其失活的主要原因.
文摘A series of CuZnAl slurry catalysts were prepared by the complete liquid-phase technology.The influence of heat treatment atmospheres with different proportions of CO2 on the performance was investigated and the catalysts were characterized by TPR,BET,XRD and XPS.The results show that introduction of CO2 into heat treatment atmosphere influences obviously on the structure of catalysts before reaction but less on that of the ones after reaction.The reason is under the conditions of reaction,the bulk structure,pore structure and surface state will voluntarily go to same.The heat treatment atmosphere with different content of CO2 influences obviously on the reductive performance of the catalysts,low reductive temperature is corresponding to high DME space-time yield and right amount of Cu metal and Cu2O to high CO conversion.The introduction of CO2 into heat treatment atmosphere restrains the water-gas shift reaction,raising the DME selectivity.The proper amount of CO2 in the heat treatment atmosphere can result in the increase of DME space-time yield.In this work,when the content of CO2 in the heat treatment atmospheres is 50%,the performance of catalysts is best.
