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NO Reduction with CO on Low‐loaded Platinum‐group Metals (Rh, Ru, Pd, Pt, and Ir) Atomically Dispersed on Ceria

Journal Article · · ChemCatChem
 [1];  [2];  [2];  [2];  [3];  [2];  [3]
  1. Pacific Northwest National Laboratory Richland Washington 99354 United States, Present address: College of Chemical Engineering Zhejiang University of Technology Hangzhou Zhejiang 310014 China
  2. Pacific Northwest National Laboratory Richland Washington 99354 United States
  3. Pacific Northwest National Laboratory Richland Washington 99354 United States, The Gene and Linda Voiland School of Chemical Engineering and Bioengineering Washington State University Pullman Washington 99164 United States
Abstract

Low‐loaded platinum‐group single‐atom catalysts on CeO 2 (M 1 /CeO 2 ) were synthesized via high‐temperature atom trapping (AT) and tested for the NO+CO reaction under dry and wet conditions. The activity of these catalysts for NO+CO reaction follows the order Rh>Pd≈Ru>Pt>Ir. For Rh, Ru, and Pd single‐atom catalysts, the N 2 O byproduct is formed but not clearly observed in Ir and Pt cases, which may result from the higher reaction temperature (>200 °C) required for Pt and Ir catalysts. The presence of water can promote the activity of these M 1 /CeO 2 catalysts for the NO+CO reaction. Under wet conditions, significant NH 3 formation occurred during the reaction, which is due to the co‐existence of water‐gas‐shift reaction on these catalysts. Compared with Pt, Pd and Ir, the Rh and Ru single‐atom catalysts show higher selectivity to NH 3 species, resulting from the hydride species on the surface. Among all tested catalysts, Ru 1 /CeO 2 shows the highest production of ammonia and highest CO conversion due to excellent water‐gas‐shift activity, whereas Pd 1 /CeO 2 shows lowest ammonia production. Rh 1 /CeO 2 shows the best low temperature NO reduction activity among all tested catalysts.

Sponsoring Organization:
USDOE
OSTI ID:
2294133
Alternate ID(s):
OSTI ID: 2335939
Journal Information:
ChemCatChem, Journal Name: ChemCatChem Journal Issue: 7 Vol. 16; ISSN 1867-3880
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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