Cu-Zn-Al slurry catalysts were prepared using a complete liquid-phase preparation technology under different heat treatment atmospheres.The catalysts were characterized using X-ray diffraction,X-ray photoelectron spec...Cu-Zn-Al slurry catalysts were prepared using a complete liquid-phase preparation technology under different heat treatment atmospheres.The catalysts were characterized using X-ray diffraction,X-ray photoelectron spectroscope,and N2 adsorption-desorption.Their application in the single-step synthesis of dimethyl ether from syngas was also investigated.The results indicate that the type of heat treatment atmosphere has an influence on the Cu species and the Cu0/Cu＋ ratio on the catalyst surface.Moreover,the final Cu/Zn ratio on the catalyst surface is mainly dependent on the composition and reaction environment of the catalyst and less on the type of heat treatment atmosphere.The prepared catalysts can suppress sintering of active sites at high temperatures,and the type of heat treatment atmosphere mainly affects the capability of the catalyst for methanol synthesis.The catalysts perform best using N2 as the heat treatment atmosphere.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
基金supported by the National Natural Science Foundation of China(No.20706039)the National Basic Research Program(973 Program) of China (No.2005CB221204)+1 种基金the Program for the Top Young Academic Leaders of Higher Learning Institutions of Shanxi of China in 2010the Young Scientific and the Technical Fund of Shanxi of China (No.2006021010)
文摘Cu-Zn-Al slurry catalysts were prepared using a complete liquid-phase preparation technology under different heat treatment atmospheres.The catalysts were characterized using X-ray diffraction,X-ray photoelectron spectroscope,and N2 adsorption-desorption.Their application in the single-step synthesis of dimethyl ether from syngas was also investigated.The results indicate that the type of heat treatment atmosphere has an influence on the Cu species and the Cu0/Cu＋ ratio on the catalyst surface.Moreover,the final Cu/Zn ratio on the catalyst surface is mainly dependent on the composition and reaction environment of the catalyst and less on the type of heat treatment atmosphere.The prepared catalysts can suppress sintering of active sites at high temperatures,and the type of heat treatment atmosphere mainly affects the capability of the catalyst for methanol synthesis.The catalysts perform best using N2 as the heat treatment atmosphere.
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.
