助剂对超细CuO－ZnO－SiO_2催化剂性质和CO_2加氢反应性能的影响  

Effect of Promoters on the Catalytic Performance and Properties of Ultrafine CuO ZnO SiO 2 Catalyst for Hydrogenation of CO 2

作　　者：迟亚武[1] 梁东白[1] 杜鸿章[1] 徐长海[1] 林培滋[1] 罗洪原[1] 林励吾[1] 

机构地区：[1]中国科学院大连化学物理研究所

出　　处：《分子催化》1996年第6期430-434,共5页Journal of Molecular Catalysis(China)

摘　　要：研究了９种助剂对用于ＣＯ２加氢反应的超细ＣｕＯ－ＺｎＯ－ＳｉＯ２催化剂性能的影响，并进行了ＸＲＤ和ＴＰＲ表征．结果表明，助剂影响超细催化剂的性质和催化性能，ＴｉＯ２、ＣｅＯ２、ＭｇＯ和Ｌａ２Ｏ３是ＣＯ２加氢合成甲醇的超细ＣｕＯ－ＺｎＯ－ＳｉＯ２催化剂体系的优良助剂．在含有不同助剂的ＣｕＯ－ＺｎＯ－ＳｉＯ２催化剂体系内存在ＣｕＯ和ＺｎＯ晶相，但除ＣｅＯ２以外，其它的助剂都可能以微晶或无定型的形式存在．ＴＰＲ研究表明，添加的助剂除ＣｅＯ２以外，都使超细ＣｕＯ－ＺｎＯ－ＳｉＯ２催化剂的还原温度提高，而且助剂对ＣｕＯ－ＺｎＯ－ＳｉＯ２催化剂活性的影响。Hydrogenation of CO 2 were carried out over ultrafine CuO ZnO SiO 2 catalysts containing various promoters (BaO, K 2O, Al 2O 3, Na 2O, La 2O 3, Li 2O, TiO 2, MgO, CeO 2) prepared by alkoxide method and these catalysts were investigated by XRD and TPR (Temperature programmed reduction) techniques. Our studies showed that addition of promoters affected the activities and properties of ultrafine CuO ZnO SiO 2 catalysts, and TiO 2, CeO 2, MgO and La 2O 3 were favorable promoters for methanol synthesis from the hydrogenation of CO 2. In all catalyst systems, both CuO and ZnO exhibited crystalline patterns with similar intensity, and only a trace amount of CeO 2 was also detected, but other promoters could not be detected by XRD, which maybe existed in microcrystalline or amorphous state. Addtion of the above promoters except CeO 2 all caused increase of the reduction temperatures of ultrafine CuO ZnO SiO 2 catalysts. Possible relationship between activity and reduction temperature was discussed.

关 键 词：助剂 催化剂 加氢 金属催化剂 催化 

分 类 号：O643.36[理学—物理化学] O643.38[理学—化学]