期刊
CATALYSIS TODAY
卷 383, 期 -, 页码 193-204出版社
ELSEVIER
DOI: 10.1016/j.cattod.2020.06.003
关键词
WGS; Proton conductor; Pt catalyst; Water activation; Mo-doped mixed oxide
资金
- Spanish Ministerio de Economia y Competitividad (MINECO) [ENE2015-66975-C3-2-R, RTI2018-096294-B-C33]
The study synthesized a highly efficient water-gas-shift catalyst by mixing proton conductors Mo-Eu-Zr mixed oxide systems with a conventional Pt/CeO2/Al2O3 catalyst. The designed catalyst is able to reach equilibrium conversion at medium temperatures and the mechanism of proton conductors enhances catalytic activity.
Proton conductors Mo-Eu-Zr mixed oxide systems were synthesized and further mixed with a conventional Pt/CeO2/Al2O3 catalyst to develop a highly efficient water-gas-shift (WGS) catalyst. The designed catalyst, once structured, allows reach the equilibrium conversion at medium temperatures (similar to 350 degrees C) at 80 L.g(-1) h(-1) space velocity. The ability of the proton conductor to maintain an elevated water concentration at the metal-support interface by Grotthuss' mechanism boosts the catalytic activity in WGS reaction. The Mo-containing proton conductor is extensively characterized allowing to establish the formation of molybdenum oxide phases nucleating on top of the Eu sites in Eu-Zr oxide solid solution. [MoO4](2-) to [Mo7O24](6-) clusters nucleates at low Mo contents resulting in a alpha-MoO3 layer on increasing its content. In presence of H-2, Mobronzes are formed from similar to 200 degrees C enhancing water concentration at the surfaces and boosting the catalytic activity in the WGS reaction. These results pave the way for developing lower volume WGS reactors.
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