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Promoting the Methane Oxidation on Pd/CeO 2 Catalyst by Increasing the Surface Oxygen Mobility via Defect Engineering
Author(s) -
Lee Jaeha,
Lim Tae Hwan,
Lee Eunwon,
Kim Do Heui
Publication year - 2021
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.202100653
Subject(s) - catalysis , methane , x ray photoelectron spectroscopy , oxygen , anaerobic oxidation of methane , raman spectroscopy , hydrogen , chemical engineering , materials science , adsorption , inorganic chemistry , chemistry , organic chemistry , engineering , physics , optics
Methane is a useful chemical resource, but removing it, a powerful greenhouse gas, is important to prevent global warming. In this study, the methane oxidation activity of conventional Pd/CeO 2 catalyst was improved by enhancing the oxygen mobility of ceria surface via the simple defect engineering. Raman spectroscopy demonstrates that the defect concentration of ceria surface is reduced after high temperature treatments. Cryogenic hydrogen‐temperature‐programmed‐reduction curves indicate that the surface oxygen of ceria in Pd/CeO 2 catalysts with the reduced defect concentration became mobile, resulting in the facile reduction at the lower temperature. X‐ray diffraction, X‐ray photoelectron and X‐ray adsorption spectroscopies show that the improvement in the surface oxygen mobility does not originate from the change in PdO x particle size nor its oxidation state. As a result, the temperature of 50 % conversion of methane shifted by 25 °C to the lower temperature on Pd/CeO 2 catalyst with the reduced defect concentration. This work highlights that the catalytic activity can be enhanced by promoting the active participation of the surface oxygen of support.