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Title: Ceria Incorporation in Sinter-Resistant Platinum-Based Catalysts

Journal Article · · ACS Catalysis

Platinum group metals (PGM) are widely used for exhaust emission abatement. Sintering during the high-temperature emission control conditions decreases noble metal utilization efficiency. Efficient use of scarce noble metals requires sinter-resistant catalysts. Here we extend an approach to synthesize catalysts consisting of platinum nanoparticles encapsulated in a mixture of cerium and aluminum oxides (Pt@Al2O3-CeO2). We tested the activity of this catalyst toward carbon monoxide, propene, and propane oxidation chosen as model oxidation reactions for emission control catalysts. Pt@Al2O3-CeO2 catalysts demonstrated similar activity and stability upon aging as the comparison system without ceria, Pt@Al2O3, while maintaining small Pt nanoparticles and ceria crystallites. Additionally, we studied the influence of various thermal treatments on CO oxidation activity and determined that a steam treatment can activate low temperature CO oxidation activity of Pt@Al2O3-CeO2. STEM-EDS analysis revealed that thermal treatments led to the co-location of Pt and CeO2 and temperature programmed-reduction analysis revealed that the steam treatment specifically enhanced CO oxidation activity through surface reduction of the CeO2. As a result, we demonstrate the versatility of this encapsulation approach to generate mixed metal-oxide supports with improved metal-support interactions without hindering nanoparticle stability.

Research Organization:
Stanford University, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
Grant/Contract Number:
SC0022197; AC02-05CH11231; AC02-76SF00515; AC05-00OR22725
OSTI ID:
2280914
Alternate ID(s):
OSTI ID: 2438690; OSTI ID: 2440471
Journal Information:
ACS Catalysis, Journal Name: ACS Catalysis Journal Issue: 22 Vol. 13; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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