Carbon deposition and catalytic deactivation during CO2 reforming of CH4 over Co/MgO catalyst

被引：27
|
作者：
Li, Jianwei [1 ,2 ]
Li, Jun [1 ]
Zhu, Qingshan [1 ,3 ]
机构：
[1] Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
[2] China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China
[3] Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China
来源：
CHINESE JOURNAL OF CHEMICAL ENGINEERING | 2018年 / 26卷 / 11期
基金：
中国国家自然科学基金;
关键词：
Co/MgO; CH4; reforming; Carbon deposition; Co oxidization; SUPPORTED COBALT CATALYST; SOLID-SOLUTION CATALYSTS; METHANE DECOMPOSITION; REACTION-MECHANISM; RICH HYDROGEN; PERFORMANCE; TEMPERATURE; NI; STABILITY; CO/SIO2;
D O I：
10.1016/j.cjche.2018.05.025
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
The deactivation mechanism of Co/MgO catalyst for the reforming of methane with carbon dioxide was investigated. The conversion of CH4 displayed a significant decrease in the initial stage caused by carbon deposition. There were two types of cokes, carbon nanotubes (CNTs) and carbon nano-onions (CNOs). The number of the CNO layers that coated on the surface of Co nanoparticles (NPs) increased rapidly in the initial reforming time, which was responsible for the deactivation of the Co/MgO catalyst. The deposition of CNOs was attributed to the oxidation of Co NPs. Therefore, the deactivation of the Co/MgO catalyst was originated from the first oxidization of the Co NPs into Co3O4 by O species (OH intermediate, CO2, H2O) during the reforming reaction, which accelerates the formation of coke that blocked the active metal, thus led to catalyst deactivation. (C) 2018 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.
引用
收藏
页码：2344 / 2350
页数：7
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