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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
Abstract 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.