The effect of Pd precursor on Pd/Ce0.67Zr0.33O2 catalysts for automotive emission control

doi:10.1016/S1872-2067(14)60264-3

Abstract

Abstract:

A Pd/CZ(NO) catalyst prepared with Pd(NO₃)₂ as the metal precursor exhibited the best catalytic performance for HC and CO elimination because of a higher oxygen storage capacity, abundant small Pd_n clusters and a strong Pd-support interaction that facilitated electron transfer from PdO_x particles to the CZ support. A Pd/CZ(NH) catalyst prepared with Pd(NH₃)₄(NO₃)₂ as the metal precursor exhibited good performance for NO and NO₂ elimination due to a higher Pd dispersion, abundant bigger Pd_n clusters and oxidized/metallic Pd coexistence. A Pd/CZ(Cl) catalyst prepared with H₂PdCl₄ as the metal precursor exhibited low catalytic activity due to a low Pd dispersion, weak Pd-support interaction, and the trace amount of CeOCl which inhibited oxygen vacancy creation. However, it showed good thermal stability, and benefited when an aging treatment removed the residual chlorine species and also promoted the interaction between PdO_x and the support.

Key words: Palladium precursor, Three-way catalyst, Noble metal-support interaction, Light-off catalytic performance

Siyu Lin, Linyan Yang, Xue Yang, Renxian Zhou. The effect of Pd precursor on Pd/Ce_0.67Zr_0.33O₂ catalysts for automotive emission control[J]. Chinese Journal of Catalysis, 2015, 36(4): 639-648.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(14)60264-3

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The effect of Pd precursor on Pd/Ce_0.67Zr_0.33O₂ catalysts for automotive emission control

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