Ni助剂对Pt／Ce-SBA-15催化CO氧化反应性能的影响  

Effect of Ni Promoter on Pt/Ce-SBA-15 Catalyst Used in CO Oxidation

作　　者：蔡国辉[1] 洪惠云[2] 王丽华[1] 兰瑞芳[1] 郑瑛[1] 魏可镁[1] 

机构地区：[1]福州大学化肥催化剂国家工程研究中心,福建福州350002 [2]福建师范大学化学与材料学院,福建福州350007

出　　处：《石油化工》2011年第6期585-589,共5页Petrochemical Technology

基　　金：国家科技部支撑计划项目(2007BAE08B01);福建省教育厅资助项目(JA09050)

摘　　要：以三嵌段共聚物P123为模板剂、正硅酸乙酯为硅源,采用溶胶凝胶法,通过微波辅助加热实现了SBA-15分子筛和Ce掺杂的Ce-SBA-15分子筛的快速合成;通过XRD,XPS,UV-Vis DRS等手段对合成的分子筛进行了表征。表征结果显示,引入Ce得到的骨架掺杂Ce-SBA-15分子筛的有序度较高,Ce以Ce3+和Ce4+两种形式存在于分子筛中。以合成的分子筛为载体制备负载型Pt催化剂,并以CO氧化为模型反应,考察了Ni助剂的添加对催化剂活性的影响。实验结果表明,以Ce-SBA-15分子筛为载体的Pt催化剂比以SBA-15分子筛为载体的Pt催化剂具有更高的CO氧化活性,且助剂Ni的添加能进一步提高催化剂的活性;Pt-Ni/Ce-SBA-15催化剂在160℃可使CO完全转化,而Pt/SBA-15催化剂在245℃时才能使CO完全转化。SBA-15 and Ce-SBA-15 molecular sieves were synthesized by microwave assistant sol-gel method with nonionic triblock co-polymer surfactant P123 as the template and tetraethyl orthosilicate as the silicon source, and were characterized by means of XRD, XPS and UV-Vis DRS. The results showed that ordered degree of Ce-SBA-15 molecular sieves was higher than that of SBA-15 molecular sieves and the cerium species existed in the forms of both Ce^4＋ and Ce^3＋ With CO oxidation as the model reaction, the influences of Ni promoter on the catalytic performances of the Pt-based catalysts supported on both the synthesized molecular sieves were investigated. The results showed that the activity of Pt/Ce-SBA-15 was better than that of Pt/SBA-15, and adding the Ni promoter further enhanced the catalyst activity. The complete oxidation of CO was realized at 160 ℃ over Pt-Ni/Ce-SBA-15 catalyst. To reach the same conversion, the reaction temperature has to be at 245 ℃ in the case of Pt/SBA-15.

关 键 词：SBA-15分子筛 铈 铂催化剂 镍助剂 一氧化碳氧化反应 

分 类 号：TQ426.8[化学工程]