期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 282, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119614
关键词
Ageing; Support influence; Alloying; XRD; XANES
资金
- German Science Foundation (DFG) [Gr 1447/24-2]
- Ministry of Science and Higher Education of the Russian Federation [AAAA-A-17-117041710079-8]
- European Research Council [ERC-725915]
Three-way catalysts containing Au and/or Pd supported on CeZrOx (CZ) or La2O3/Al2O3 (LA) were studied for their performance in a model feed. The support material significantly influenced the catalytic behavior and Pd-Au relation. Pd-rich bimetallic combinations supported on CZ showed superior activity compared to other catalysts, while poisoning by Au was aggravated on LA after aging.
Three-way catalysts containing Au and/or Pd supported on either CeZrOx (CZ) or La2O3/Al2O3 (LA) were studied with respect to their performance in a model feed and characterized by various techniques (physisorption, CO chemisorption, TEM, XRD, XPS, XANES). A drastic support influence was found in both catalytic behavior and Pd-Au relation. While Au was a strong poison for all catalytic functions of Pd (oxidation, NO reduction) on LA, poisoning was much mitigated on CZ, rendering all Pd containing catalysts superior to a commercial reference. After ageing, the poisoning by Au was aggravated on LA. On CZ, Pd-rich bimetallic combinations retained better activity than Pd/CZ, which still outperformed the reference. As Au did not significantly contribute to propene oxidation and NO reduction, activity of Pd was markedly increased under a promoting influence of Au. Stabilization of Pd-II by ceria and delayed Pd-Au alloy formation are key features in the CZ-supported PdAu catalysts.
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