Role of lattice oxygen during CO2 reforming of methane over NiO/MgO solid solutions

被引:46
作者
Ruckenstein, E [1 ]
Hu, YH [1 ]
机构
[1] SUNY Buffalo, Dept Chem Engn, Buffalo, NY 14260 USA
关键词
CH4; CO2; Ni; MgO; lattice oxygen; transient response;
D O I
10.1023/A:1019030311127
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The CO2 reforming of methane over reduced NiO/MgO solid solution catalysts was studied at 800 degrees C by a novel transient method, which couples a broadened pulse of CH4/CO2 with a step change to the carrier gas and/or with a sharp isotopic pulse of either O-18(2) CO218 or (CO216)-C-13. The response curves indicated that two kinds of oxygen were formed over the catalysts during reaction: adsorbed oxygen which reacts fast with C species and lattice oxygen which reacts more slowly with C species. One concludes that a redox cycle of lattice oxygen formation through the oxidation of Ni and its reaction with C species takes place on the catalyst surface.
引用
收藏
页码:183 / 185
页数:3
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