燃料化学学报2016，Vol.44Issue(5)：548-556,9.
NiO@SiO2核壳催化剂在浆态床中低温甲烷化研究
NiO@SiO2 core-shell catalyst for low-temperature methanation of syngas in slurry reactor
摘要
Abstract
A series of NiO@SiO2 core-shell catalysts were prepared using modified St?ber-method. Their catalytic performances in methanation of syngas were investigated in slurry reactor at 320℃. The catalysts before and after reaction were characterized by XRD, TEM, XPS, N2-physisorption, etc. It was found that the NiO@SiO2 core-shell samples had well-shape morphologies and relatively uniform scale. The catalyst test revealed that the methanation activity of these catalysts decreased dramatically with increase of core particle size. The three catalysts with distinct size of core and shell showed remarkably rapid deactivation in the initial period of 20 h and then deactivated slowly during the following reaction, while their CH4 selectivity maintained at about 80%. Void-shell was formed during the reaction probably because easy-migrated Ni ( CO ) x species were generated. Apparently, it was concluded that increase of core particle size, decrease of BET surface area and pore volume, and abatement of mesopores within 3-5 nm in the shell were responsible for the deactivation of these core-shell catalysts based on the characterization of catalysts.关键词
核壳/Ni基催化剂/浆态床/低温甲烷化Key words
core-shell/nickel-based catalyst/slurry reactor/low-temperature methanation分类
化学引用本文复制引用
王辉,张俊峰,白云星,王文峰,谭猗生,韩怡卓..NiO@SiO2核壳催化剂在浆态床中低温甲烷化研究[J].燃料化学学报,2016,44(5):548-556,9.基金项目
The project was supported by China-Shell Global Solution International BV cooperation project.中国-荷兰壳牌公司合作项目资助本文的英文电子版由Elsevier出版社在ScienceDirect上出版(http://www. sciencedirect. com/science/journal/18725813) （http://www. sciencedirect. com/science/journal/18725813）
