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Pentacoordinated Al 3+ ‐Stabilized Active Pd Structures on Al 2 O 3 ‐Coated Palladium Catalysts for Methane Combustion
Author(s) -
Duan Huimei,
You Rui,
Xu Shutao,
Li Zhaorui,
Qian Kun,
Cao Tian,
Huang Weixin,
Bao Xinhe
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201904883
Subject(s) - catalysis , palladium , methane , atomic layer deposition , combustion , exothermic reaction , anaerobic oxidation of methane , chemistry , chemical engineering , materials science , inorganic chemistry , nanotechnology , thin film , organic chemistry , engineering
Supported Pd catalysts are active in catalyzing the highly exothermic methane combustion reaction but tend to be deactivated owing to local hyperthermal environments. Herein we report an effective approach to stabilize Pd/SiO 2 catalysts with porous Al 2 O 3 overlayers coated by atomic layer deposition (ALD). 27 Al magic angle spinning NMR analysis showed that Al 2 O 3 overlayers on Pd particles coated by the ALD method are rich in pentacoordinated Al 3+ sites capable of strongly interacting with adjacent surface PdO x phases on supported Pd particles. Consequently, Al 2 O 3 ‐decorated Pd/SiO 2 catalysts exhibit active and stable PdO x and Pd–PdO x structures to efficiently catalyze methane combustion between 200 and 850 °C. These results reveal the unique structural characteristics of Al 2 O 3 overlayers on metal surfaces coated by the ALD method and provide a practical strategy to explore stable and efficient supported Pd catalysts for methane combustion.