纳米SiC的合成及其作为载体在CO氧化反应中的应用  

Synthesis of Nano-SiC and Its Application as Support for CO Oxidation Reaction

作　　者：肖益鸿[1] 郑勇[1] 蔡国辉[1] 郑瑛[1,2] 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,福州350002 [2]福建师范大学化学与材料学院,福州

出　　处：《应用化学》2008年第11期1311-1314,共4页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(20576021);福建省自然科学基金计划(E0710004)资助项目

摘　　要：采用蔗糖为碳源、正硅酸乙酯（TEOS）为硅源,以硝酸镍为催化剂,用溶胶-凝胶法制备碳化硅前驱体,在1 000℃的动态真空条件下,将前驱体进行碳热还原,合成出比表面积为104 m2/g的SiC纳米小球（粒径为40~60 nm）。用其作为催化剂载体,通过浸渍法制备Pt/SiC催化剂,将其应用于CO氧化的模型反应中。研究结果表明,Pt/SiC催化剂具有较好的催化活性,引入铁助剂的Pt-Fe/SiC催化剂能明显地提高CO催化氧化反应的活性。催化剂Pt-Fe/SiC-2的CO最低完全转化温度为195℃,与Pt/SiC催化剂相比降低了45℃。A sol-gel process catalyzed by nickel nitrate was used for the preparation of SiC precursor from raw materials of tetraethyl orthosilicate （TEOS） and sucrose. Nano-silicon carbide （ nano-SiC ） was synthesized from SiC precursor by carbothermal reduction under dynamic vacuum condition at 1 000 ℃. The surface area of the obtained nano-SiC was 104 m2/g and the particle size was in the range from 40 to 60 nm. Pt/SiC for CO oxidation was then prepared by incipient.wetness impregnation of nano-SiC. The result shows that the catalyst exhibits relatively high activity. The addition of Fe results in the improvement of catalytic performance for the oxidation of CO. Compared to Pt/SiC, the lowest temperature for the complete conversion of CO on Pt-Fe/SiC- 2（195 ℃） is lowered by45 ℃.

关 键 词：纳米SIC 真空 载体 CO氧化 铂 铁助剂 

分 类 号：O612.4[理学—无机化学]