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Issue 1, 2017
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New insights into the support morphology-dependent ammonia synthesis activity of Ru/CeO2 catalysts

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Abstract

Three ceria nanocrystals with different morphologies (nanocubes, nanorods, and nanoparticles) were synthesized and used as supports to evaluate the support morphology-dependent ammonia synthesis activity in the structure-sensitive ammonia synthesis reaction. The Ru/r-CeO2 catalyst shows a higher catalytic reaction rate (3830 μmol g−1 h) than that of Ru/c-CeO2 (1289 μmol g−1 h) and Ru/p-CeO2 (529 μmol g−1 h) under the reaction conditions of 400 °C, 1 MPa, and 60 mL min−1. In addition, promoters (Cs, K, and Ba) can effectively enhance the catalytic activity of the catalysts such as 2Cs–Ru/r-CeO2 (14 266 μmol g−1 h) and 2K–Ru/r-CeO2 (11 227 μmol g−1 h). The effect of the morphology of the CeO2 support on the metal–support interaction and catalytic performance of the Ru/CeO2 catalysts can be correlated to the exposed crystal planes and surface composition/electronic structure of the CeO2 support with diverse morphologies.

Graphical abstract: New insights into the support morphology-dependent ammonia synthesis activity of Ru/CeO2 catalysts

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Supplementary files

Article information


Submitted
01 Oct 2016
Accepted
24 Nov 2016
First published
24 Nov 2016

Catal. Sci. Technol., 2017,7, 191-199
Article type
Paper

New insights into the support morphology-dependent ammonia synthesis activity of Ru/CeO2 catalysts

Z. Ma, S. Zhao, X. Pei, X. Xiong and B. Hu, Catal. Sci. Technol., 2017, 7, 191
DOI: 10.1039/C6CY02089E

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