NiO／SiO_2－Al_2O_3超细催化剂上CO氧化反应的研究

采用溶胶凝胶－超临界干燥法制备的ＮｉＯ／ＳｉＯ２－Ａｌ２Ｏ３催化剂对ＣＯ氧化显示出可与贵金属催化剂相类比的优良活性。以ＣＯ氧化的最低完全转化温度为基准，研究了不同制备参数对反应行为的影响规律，并结合程序升温还原（ＴＰＲ）结果对其活性位进行了探讨。结果表明，在ＮｉＯ／ＳｉＯ２－Ａｌ２Ｏ３系催化剂上ＣＯ氧化反应具有两类不同的活性位：ＮｉＯ及八面体配位的镍；制备参数通过影响活性位从而影响反应行为；优化制备参数为ＮｉＣｌ２前驱物、ＳｉＯ２载体、３％含量及制载体浸渍

Study of CO oxidation on ultrafine NiO/SiO 2 Al 2O 3 catalysts

NiO/SiO 2 Al 2O 3 catalysts prepared by sol gel method involving supercritical technique showed high activities in CO oxidation. According to orthogonal analysis, the best one should be the catalyst of 3%(mass) NiO prepared by impregnating SiO 2 with NiCl 2 solution. With TPR approach, there exist two types of active sites. NiO and octahedron Ni seemed to be responsible for the active sites for CO oxidation.