Understanding the nature of Pt-Rh synergy for three-way conversion catalysis

被引：10

作者：

Li, Yuejin ^{[1
]}

Low, Ke-Bin ^{[2
]}

Sundermann, Andreas ^{[3
]}

Zhu, Haiyang ^{[2
]}

Betancourt, Luis E. ^{[2
]}

Kang, Chansoon ^{[2
]}

Johnson, Shantel ^{[2
]}

Xie, Shaohua ^{[4
]}

Liu, Fudong ^{[4
]}

机构：

[1] BASF Environm Catalyst & Met Solut, Iselin, NJ 08830 USA

[2] BASF Corp, Iselin, NJ 08830 USA

[3] hte GmbH, Kurpfalzring 104, D-69123 Heidelberg, Germany

[4] Univ Cent Florida, Nanosci Technol Ctr NSTC, Dept Civil Environm & Construct Engn, Catalysis Cluster Renewable Energy & Chem Transfor, Orlando, FL 32816 USA

来源：

APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2023年 / 334卷

关键词：

Pt-Rh synergy; TWC; Automotive catalysts; CO OXIDATION; ALUMINA; REDUCTION; NO; PLATINUM; RH/AL2O3; BEHAVIOR; OXIDE; PD;

D O I：

10.1016/j.apcatb.2023.122821

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A series of Al2O3 supported Pt, Rh and Pt-Rh catalysts was investigated for TWC catalysis. Profound synergy between Pt and Rh was found on all Pt-Rh compositions relative to their single metal references with significantly reduced light-off temperatures. The nature of this synergy was probed using various characterization techniques. CO chemisorption, CO-DRIFTS and XPS results show that the surface Rh concentrations on aged Pt-Rh catalysts are much higher than that of the Rh reference. In addition, on the bimetallic catalysts the Rh species is in a more reduced state as indicated by XPS and XANES. AC-STEM/EDS results clearly illustrate that there are two types of Rh species on an aged Pt-Rh catalyst in terms of its location: one sitting on Pt particles as Rh nanoparticles and the other associated with the Al2O3 support as sub-nano Rh moieties. The Pt-Rh bimetallic particles contain a certain degree of Pt-Rh alloy as evidenced by the upshift of the metal XRD peaks and the Pt-Rh coordination from the EXAFS measurement. All structural and microscopy analyses suggest that Rh is surface enriched on the Pt-Rh particles, and it is the surface enriched Rh species that plays a primary role in enhancing the activity of Pt-Rh catalysts.

引用

页数：13

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