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Tuning Al 2 O 3 Surface with SnO 2 to Prepare Improved Supports for Pd for CO Oxidation
Author(s) -
Wang Xiang,
Tian Jin Shu,
Zheng Yu Hua,
Xu Xiang Lan,
Liu Wen Ming,
Fang Xiu Zhong
Publication year - 2014
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.201402052
Subject(s) - x ray photoelectron spectroscopy , catalysis , monolayer , materials science , adsorption , desorption , chemical engineering , oxygen , dispersion (optics) , precipitation , deposition (geology) , phase (matter) , chemistry , nanotechnology , organic chemistry , paleontology , physics , optics , sediment , meteorology , engineering , biology
Abstract SnO 2 /Al 2 O 3 supports with different SnO 2 loadings were prepared by using a deposition–precipitation method and characterized by using N 2 and CO adsorption–desorption, XRD, H 2 temperature‐programmed reduction, and X‐ray photoelectron spectroscopy techniques. SnO 2 dispersed finely on the Al 2 O 3 surface with a capacity of 0.172 mmol 100 m −2 , which equals 6.4 % SnO 2 loading. Below this loading, no crystalline SnO 2 can be detected owing to the formation of the sub‐monolayer‐ or monolayer‐dispersed SnO 2 phase. Crystalline SnO 2 can be observed only if the SnO 2 loading reaches 9 %. With use of these SnO 2 /Al 2 O 3 supports, all prepared Pd/SnO 2 /Al 2 O 3 catalysts demonstrate increased activity compared to Pd/SnO 2 and Pd/Al 2 O 3 owing to the presence of more active oxygen species on SnO 2 /Al 2 O 3 supports as well as their higher surface areas, which improve Pd dispersion. This result indicates that with SnO 2 /Al 2 O 3 supports, less amount of Pd can be used to obtain catalysts with competitive performance.