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Title: Alumina-supported sub-nanometer Pt 10 clusters: Amorphization and role of the support material in a highly active CO oxidation catalyst

Catalytic CO oxidation is unveiled on size-selected Pt 10 clusters deposited on two very different ultrathin (≈0.5–0.7 nm thick) alumina films: (i) a highly ordered alumina obtained under ultra-high vacuum (UHV) by oxidation of the NiAl(110) surface and (ii) amorphous alumina obtained by atomic layer deposition (ALD) on a silicon chip that is a close model of real-world supports. Notably, when exposed to realistic reaction conditions, the Pt 10/UHV-alumina system undergoes a morphological transition in both the clusters and the substrate, and becomes closely akin to Pt 10/ALD-alumina, thus reconciling UHV-type surface-science and real-world experiments. The Pt 10 clusters, thoroughly characterized via combined experimental techniques and theoretical analysis, exhibit among the highest CO oxidation activity per Pt atom reported for CO oxidation catalysts, due to the interplay of ultra-small size and support effects. Lastly, a coherent interdisciplinary picture then emerges for this catalytic system.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [2] ;  [1] ;  [4] ;  [4] ;  [1] ;  [5] ;  [3] ;  [6] ;  [6] ; ORCiD logo [3] ; ORCiD logo [7] ;  [1]
  1. Argonne National Lab. (ANL), Lemont, IL (United States)
  2. Consiglio Nazionale delle Ricerche, Pisa (Italy)
  3. Toyota Central R&D Labs. Inc., Nagakute (Japan)
  4. Univ. Rostock, Rostock (Germany)
  5. Toyota Motor Corp., Susono (Japan)
  6. Bhabha Atomic Research Centre, Mumbai (India)
  7. Consiglio Nazionale delle Ricerche, Pisa (Italy); California Inst. of Technology (CalTech), Pasadena, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Journal of Materials Chemistry. A
Additional Journal Information:
Journal Volume: 5; Journal Issue: 10; Journal ID: ISSN 2050-7488
Publisher:
Royal Society of Chemistry
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; CO oxidation; DFT calculations; HV and atmospheric pressure conditions; amorphous and crystalline alumina; subnanometer Pt clusters
OSTI Identifier:
1352556