二氧化硅载铜催化剂物性结构对水煤气变换反应活性的影响

Effect or the Structure or Cu/SiO_2 Catalyst on Its Activity in Water-gas Shirt Reaction

采用Ｘ－射线衍射法、ＤＳＣ、ＴＧＡ热分析及微孔结构分析技术，对以沉积一沉淀法制备的ＳｉＯ２载Ｃｕ催化剂进行了物性结构测试分析，对催化剂的失活原因进行了讨论．结果表明，ＣＵ／ＳｉＯ２催化剂的还原温度在１２０～３５０℃区间，在ＤＳＣ曲线上呈现三个特征还原峰，催化剂水煤气变换反应的活性组份是高度分散于无定形ＳｉＯ２载体内部并与之发生健合的铜晶粒，随着变换反应的进行，活性钢晶粒逐渐长大，迁移出ＳｉＯ２界面，使催化剂活性受到影响．

The structure characterization of silica-supported copper catalysts prepared by deposition--precipitation from homogeneous solution was studied by XRD,DSC,TGA,Thermal Analysis and pore structure analysis. The results indicated that tile catalyst was reduced between 120℃ and 350℃ in a hydrogen now.The catalytic active components for water-gas shift reaction is extremely small copper partides dispersed in silica and binding with it.