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Enhanced Activity in Methane Dry Reforming by Carbon Dioxide Induced Metal‐Oxide Interface Restructuring of Nickel/Zirconia
Author(s) -
Steib Matthias,
Lou Yu,
Jentys Andreas,
Lercher Johannes A.
Publication year - 2017
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.201700686
Subject(s) - carbon dioxide reforming , catalysis , methane , nickel , dissociation (chemistry) , oxide , cubic zirconia , oxygen , carbon dioxide , chemistry , metal , carbon fibers , chemical engineering , syngas , cobalt , inorganic chemistry , materials science , organic chemistry , ceramic , composite number , engineering , composite material
The activity of the Ni/ZrO 2 catalyst for the dry reforming of methane was significantly enhanced by activation and regeneration in the presence of CO 2 . Exposure to CO 2 maximized and dynamically restructured the Ni–ZrO 2 interface, which was critical to obtain a stable catalyst. The ZrO 2− x species at this interface was found to act catalytically by accepting and transferring one oxygen atom of CO 2 to the Ni surface, which resulted in the release of CO in the decomposition of transiently formed carbonates. This was found to open a fast additional reaction pathway to convert CO 2 that eclipsed direct CO 2 dissociation on Ni. The kinetically controlled availability of atomic oxygen by this pathway reduced the carbon concentration on the surface, which led to less refractory carbon deposition and more facile regeneration.