钾、钴改性CeO2-ZrO2/SiC催化碳烟燃烧性能研究  

CATALYTIC SOOT COMBUSTION PERFORMANCE OF CeO_2-ZrO_2/SiC MODIFIED WITH K OR Co

作　　者：邬红龙 郭军[1,2] 张旺[1,2] 陈卓[1,2] 

机构地区：[1]贵州师范大学化学与材料科学学院,贵阳550001 [2]贵州省功能材料化学重点实验室

出　　处：《石油炼制与化工》2016年第1期49-53,共5页Petroleum Processing and Petrochemicals

基　　金：贵州省“125计划”重大科技专项(黔教合重大专项字[2013]020号);贵州省科技支撑计划项目(黔科合计Z字[2013]4001号);贵阳市科技创新平台计划项目(筑科合同[2012303]14号);贵州省自然科学基金项目(黔科合J字[2012]2278号)

摘　　要：分别用钾盐以及Co_3O_4对铈锆复合氧化物进行单掺杂和复合掺杂,制得一系列钾、钴改性CeO_2-ZrO_2催化剂,采用溶胶凝胶浸渍法将所制催化剂负载于SiC上,并用氮气吸附-脱附(BET)、X射线粉末衍射(XRD)、氢气程序升温还原(H_2-TPR)和程序升温氧化反应(TPO)等方法考察了钾、钴离子对催化剂结构和催化活性的影响。结果表明:采用钴修饰铈锆复合氧化物催化剂后能够明显提高其表面氧的活性,从而提高催化剂的催化能力;当催化剂中存在钾物种时,主要通过改善碳烟与催化剂的接触状况而有效促进碳烟的燃烧;与未负载催化剂相比,负载后各催化剂催化碳烟燃烧能力都出现不同程度的降低;各负载型催化剂的催化活性由大到小的顺序为K-Co-Ce-Zr/SiC>K-Ce-Zr/SiC>Co-Ce-Zr/SiC>Ce-Zr/SiC>Co-Zr/SiC;K-Co-Ce-Zr/SiC催化体系在经过5次循环使用后仍具有较高的催化碳烟燃烧能力,显示出较好的稳定性。A series of CeO2-ZrO2 complex oxides modified with K and/or Co salt were prepared and then loaded on SiC support to obtain K and/or Co-CeO2-ZrO2/SiC catalysts by sol-gel impregnation method. The prepared catalysts were characterized by XRD, BET, H2-TPR and temperature-pro- grammed oxidation （TPO） techniques and activity tests to investigate the effect of K and/or Co on the catalyst structure and catalytic soot combustion performance. The results show that the addition of Co increases significantly the surface oxygen activity of the catalyst for soot combustion, while the addition of K improves the contact situation between soot and catalyst, resulting in high activity for soot combustion. It is found that compared with the modified complex oxides, the catalysts all display lower soot combustion activity. The activities of the catalysts for soot combustion are in the following order： K-Co-Ce-Zr/SiC〉 K-Ce-Zr/SiC 〉 Co-Ce-Zr/SiC 〉 Ce-Zr/SiC 〉 Co-Zr/SiC. After cycling 5 times the K-Co-Ce-Zr/SiC catalyst still shows a superior activity and high stability for soot combustion.

关 键 词：铈锆复合氧化物 SIC 碳烟燃烧 催化性能 

分 类 号：O643.36[理学—物理化学] X701[理学—化学]