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Can We Shift and/or Broaden the Catalysis Regime towards Ambient Temperature?
Author(s) -
Gopinath Chinnakonda S.,
Roy Kanak,
Nagarajan Sankaranarayanan
Publication year - 2015
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201402979
Subject(s) - catalysis , ambient pressure , x ray photoelectron spectroscopy , chemistry , valence (chemistry) , metal , photochemistry , chemical engineering , thermodynamics , organic chemistry , physics , engineering
An attempt was made to shift the temperature regime of oxidation catalysis towards ambient temperatures by employing surface modification (SM) as a handle. Systematic SM of Pd(1 1 1) was performed by O‐atom diffusion into the subsurfaces. Virgin and modified Pd(1 1 1) catalysts were evaluated for CO oxidation. Typical CO poisoning observed on virgin surfaces was partially lifted, and ambient CO oxidation was observed on the modified surfaces. CO oxidation was followed by the molecular beam method and near‐ambient pressure (NAP) photoelectron spectroscopy under different pressure regimes. UV valence band spectral analysis of the SM and the CO+O 2 reaction on modified Pd(1 1 1) surfaces under NAP conditions demonstrated changes in the electronic structures of the surfaces with a change in surface potential by 0.35 eV and directly probed CO 2 formation under the reaction conditions. Supported metal catalysts may be subjected to SM and evaluated for a shift in the catalysis regime for many different reactions.