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Highly Active and Stable Pd−GaO x /Al 2 O 3 Catalysts Derived from Intermetallic Pd 5 Ga 3 Nanocrystals for Methane Combustion
Author(s) -
Hou Zhiquan,
Liu Yuxi,
Deng Jiguang,
Lu Yue,
Xie Shaohua,
Fang Xiuzhong,
Dai Hongxing
Publication year - 2018
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.201801684
Subject(s) - catalysis , intermetallic , palladium , sintering , materials science , methane , catalytic combustion , noble metal , nanocrystal , hydrothermal circulation , oxide , chemical engineering , anaerobic oxidation of methane , inorganic chemistry , metal , nanotechnology , chemistry , metallurgy , organic chemistry , alloy , engineering
Catalytic combustion of methane is widely used in industrial and transportation activities. The commonly used Pd‐based catalysts, however, are easily deactivated under hydrothermal conditions. In this work, we adopted a novel strategy to prepare a GaO x ‐doped Pd/Al 2 O 3 catalyst via the oxidative transformation of intermetallic Pd 5 Ga 3 nanocrystals supported on γ ‐Al 2 O 3 . We observed a synergistic effect between palladium and gallium oxide via formation of a bi‐functional active Pd−O−Ga phase, resulting in a highly active and exceptionally stable catalyst that could markedly suppress the sintering of noble metals under harsh conditions (hydrothermal treatment at 750 °C). Moreover, the presence of a large amount of surface oxygen vacancies and the surface Pd−O−Ga phase could promote methane combustion over the catalysts. It is believed that such a novel dual‐metal catalyst is promising in practical applications for methane combustion.