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Title: Differentiating supported platinum single atoms, clusters and nanoparticles by styrene hydrogenation

Journal Article · · Molecular Catalysis (Online)
 [1];  [2];  [2];  [3]; ORCiD logo [3]; ORCiD logo [4];  [1];  [5];  [5];  [5];  [6];  [6];  [7]; ORCiD logo [7];  [1]
  1. Univ. of Maryland, College Park, MD (United States)
  2. Army Research Lab., Adelphi, MD (United States)
  3. City Univ. of New York (CUNY), NY (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
  5. Univ. of Delaware, Newark, DE (United States)
  6. Univ. of California, Santa Barbara, CA (United States)
  7. Stony Brook Univ., NY (United States)

Supported metal catalysts often consist of metal sites ranging from nanoparticles to subnanometer clusters and single atoms. It remains a necessity to differentiate these sites to guide design of optimal catalysts. Here we report a simple method to assess the distribution of metal active sites in catalyst samples. The method takes the advantage of the structure sensitivity of styrene hydrogenation over titania supported platinum (Pt) catalysts with Pt aggregates varied from single atom to ~1.40 nm nanoparticles. The physicochemical properties were characterized by STEM, XPS, XANES, H2-TPR and CO-chemisorption measurements. The reactivity of Pt sites was quantified by styrene hydrogenation at ambient conditions. The nanometer-sized Pt clusters have significantly higher activity than Pt nanoparticles, sub-nanometer clusters or isolated single atoms. Additionally, the relationship between activity and structural/electronic properties of Pt sites influenced by particle sizes was discussed. Similar relationship was found in the carbon supported Pt catalysts.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Catalysis Center for Energy Innovation (CCEI)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; SC0001004; SC0012335
OSTI ID:
1896876
Report Number(s):
BNL-223661-2022-JAAM
Journal Information:
Molecular Catalysis (Online), Vol. 531; ISSN 2468-8231
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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