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CrOx-promoted Ru/Al2O3 for CO2 methanation: Formation of surface Cr-doped RuO2 solid solution plays key roles by Zhiqiang Zhang; Shaorong Deng; Xiuzhong Fang; Junwei Xu; Xianglan Xu; Xiang Wang is a Engineering article available to read on EtoBox.

What is CrOx-promoted Ru/Al2O3 for CO2 methanation: Formation of surface Cr-doped RuO2 solid solution plays key roles about?

The Ru catalysts supported on CrOx-modified Al2O3 with varied Cr amounts were prepared via a step impregnation method and used for CO2 methanation. For fresh RuO2/x%CrOx/Al2O3 samples, part of Cr3+ and Cr6+ cations on the Al2O3 support surface were dissolved the RuO2 lattice to form a solid solution structure by reactions between the precursor of RuO2 and the high dispersed CrOx. This structure significantly retarded the crystallization of RuO2 and the aggregation of Ru during reduction, thus significantly decreasing the size of Ru nanoparticles and enhancing the metal-support interaction in reduced Ru/x%CrOx/Al2O3 catalysts. Consequently, the turnover frequency of CO2 on the best Ru/7%CrOx/Al2O3 catalyst at 200 °C was 0.15 s−1, 13.6 times higher than that on Ru/Al2O3. The in situ FTIR spectra results demonstrate that Ru/7%CrOx/Al2O3 possessing much higher activity than Ru/Al2O3 can be attributed to formation of the linear-CO\* with higher CO hydrogenation activity and conversion of the formates for CO2 methanation on Ru/7%CrOx/Al2O3.

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Author

Zhiqiang Zhang; Shaorong Deng; Xiuzhong Fang; Junwei Xu; Xianglan Xu; Xiang Wang

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)