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Issue 14, 2016
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Local structures and TWC activity of Pd supported on Ni-substituted aluminium oxide borates

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Abstract

A series of transition metal-substituted aluminium oxide borates, MxAl20−xB4O36 (M–10A2B), were investigated as supports for Pd catalysts. The Ni-substituted compound (Ni–10A2B, x = 1.0) exhibited the highest metal dispersion and catalytic activity under simulated three-way catalysis conditions. X-ray absorption fine structure analysis and density functional theory calculations suggested that Ni2+ occupies an octahedral Al site in the bulk structure. Although Ni2+ ions exposed on the surface of the support are unlikely to contribute to chemisorption under stoichiometric and/or lean conditions, considerable NO adsorption on the Ni sites occurred when the catalyst was partially reduced under rich conditions. Because the as-formed nitrosyl species on Ni–10A2B reacted with hydrogen, which was generated by C3H6–H2O and CO–H2O reactions, and subsequently activated by Pd, the Pd/Ni–10A2B catalyst significantly promoted NO conversion under rich conditions.

Graphical abstract: Local structures and TWC activity of Pd supported on Ni-substituted aluminium oxide borates

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Supplementary files

Article information


Submitted
27 Dec 2015
Accepted
16 Mar 2016
First published
17 Mar 2016

Catal. Sci. Technol., 2016,6, 5464-5472
Article type
Paper

Local structures and TWC activity of Pd supported on Ni-substituted aluminium oxide borates

Y. Nagao, T. Hamada, A. Imamura, S. Hinokuma, Y. Nakahara and M. Machida, Catal. Sci. Technol., 2016, 6, 5464
DOI: 10.1039/C5CY02274F

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