催化作用
二氧化碳重整
材料科学
微型多孔材料
化学工程
甲烷
碳纤维
纳米颗粒
镍
合成气
纳米技术
冶金
化学
有机化学
复合材料
工程类
复合数
作者
Honggen Peng,Xianhua Zhang,Li Zhang,C. N. R. Rao,Jie Lian,Wenming Liu,Jiawei Ying,Guohua Zhang,Zheng Wang,Ning Zhang
出处
期刊:Chemcatchem
[Wiley]
日期:2016-12-14
卷期号:9 (1): 127-136
被引量:61
标识
DOI:10.1002/cctc.201601263
摘要
Abstract Methane dry reforming (MDR) is a very important reaction, which can efficiently use two kinds of greenhouse gases (CO 2 and CH 4 ) to prepare synthesis gas or produce green hydrogen energy. What inhibits the industrialization of MDR is the sintering of active Ni nanoparticles and severe carbon deposition for Ni‐based catalysts. To resolve these problems, a novel structured catalyst with multiple ultra‐small Ni nanoparticles (4.3 nm) as the core and microporous silica as the shell was rationally fabricated by a facial one‐pot reverse micelle method and applied for MDR. The multiple‐cores@shell (M‐Ni@SiO 2 ) catalyst displays superior carbon resistance and long‐term durability with the methane and carbon dioxide conversion close to thermodynamic equilibrium and a H 2 to CO molar ratio near 1, whereas the commercial catalyst, Ni/Al 2 O 3 , and Ni directly supported on silica spheres (Ni/SiO 2 ) show low stability and notable carbon deposition. The ultra‐small Ni particle size and confinement effect of the porous silica shell are believed to be the determining factors for the outstanding performance of the multiple‐cores@shell catalyst. The novel multiple‐cores@shell structure catalyst could be potentially used for industrial applications of MDR.
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