CO2 methanation over alumina-supported cobalt oxide and carbide synthesized by reverse microemulsion method

被引:24
作者
Yu, Yue [1 ]
Mottaghi-Tabar, Sogol [1 ]
Iqbal, Muhammad Waqas [1 ,2 ]
Yu, Aiping [1 ]
Simakov, David S. A. [1 ]
机构
[1] Univ Waterloo, Dept Chem Engn, Waterloo, ON N2L 3G1, Canada
[2] Univ Engn & Technol Lahore, Chem Polymer & Composite Mat Engn Dept, KSK Campus, Lahore, Pakistan
基金
加拿大创新基金会; 加拿大自然科学与工程研究理事会;
关键词
Reverse microemulsion method; Cobalt carbide; CO2; methanation; CARBON-DIOXIDE; CATALYSTS; HYDROGENATION; SELECTIVITY; CONVERSION; PD;
D O I
10.1016/j.cattod.2020.08.017
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
High surface area alumina-supported cobalt oxides and carbides were synthesized using a one-pot reverse microemulsion method (followed by carburization for carbides). Two reverse microemulsion synthesis variations gave fine powders having specific surface areas ranging from 178-272 m(2)/g, consisting of cobalt oxide or cobalt carbide nanoparticles (5-10 nm) dispersed on gamma-alumina (10-13 wt% cobalt loadings). The resulted materials were tested for CO2 hydrogenation. Although all materials (two oxides and two carbides) were catalytically active, only cobalt carbides showed high selectivity to CH4 formation (up to 99 %), while also being significantly more active and stable than corresponding cobalt oxides (up to 89 % CO2 conversion for carbides). Investigation by in situ FTIR has shown significant differences in the reaction intermediates indicating different reaction mechanisms of CO2 hydrogenation on cobalt oxide and cobalt carbide surfaces.
引用
收藏
页码:250 / 261
页数:12
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