文献类型：期刊文献

英文题名：Bimetallic Ni-Co/SBA-15 catalysts prepared by urea co-precipitation for dry reforming of methane

作者：Xin, Jinni[1];Cui, Hongjie[1];Cheng, Zhenmin[1];Zhou, Zhiming[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2018

卷号：554

起止页码：95

外文期刊名：APPLIED CATALYSIS A-GENERAL

收录：;EI(收录号：20180604768429);WOS:【SCI-EXPANDED(收录号:WOS:000428104400011)】；

基金：Financial supports from the National Natural Science Foundation of China (21776088) and the Fundamental Research Funds for the Central Universities (222201718003) are gratefully acknowledged.

语种：英文

外文关键词：Dry reforming of methane; Ni-Co/SBA-15; Urea co-precipitation; Structure-sensitive; Coke- and sintering-resistance

摘要：A series of NixCo(10-x)/SBA-15 catalysts with constant metal loading (10 wt%) and different Co/Ni mass ratios (0/ 10-10/0) were prepared by urea co-precipitation and applied to the dry reforming of methane (DRM). The physicochemical properties of the catalysts were characterized in detail by various techniques (N-2 physisorption, H-2 chemisorption, XRD, TPR, ICP-OES, TGA, HRTEM and)(PS), revealing that Ni and Co particles were embedded into the channel of SBA-15 and Ni was alloyed with Co. In addition, the bimetallic catalysts with a Co/Ni ratio (R-Co/Ni) lower than 1 had relatively high metal dispersion (ca. 17-20%) and small metal particle sizes (ca. 4-5 nm). The DRM activity and stability of NixCo(10-x)/SBA-15 in terms of coke- and sintering-resistance were systematically examined and compared, which showed that the activity and stability of the catalysts depended strongly on the metal particle size, indicating the structure-sensitive character of the DRM reaction. Compared to monometallic Ni-10/SBA-15 and Co-10/SBA-15, bimetallic NixCo(10-x)/SBA-15 with R-Co/Ni < 1 possessed improved activity and stability, which was mainly attributed to the small metal particle size, the synergetic effect of Co and Ni as well as the confinement effect of SBA-15 mesoporous channels. In particular, Ni9Co1/SBA-15 exhibited the highest activity, stability and H-2/CO molar ratio (close to 1) during 50 h of operation at a gas hourly space velocity of 72000 mL/(g(cat) h) under 973 and 1073 K. Moreover, no coke deposition occurred on the catalyst, with only slight metal particle size growth to around 5 nm, indicating excellent coke- and sintering-resistance.