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Size Effect of Gold Sol/ γ ‐Alumina on the Catalytic Activities of CO Oxidation
Author(s) -
Wang WeiHua,
Cao GengYu
Publication year - 2006
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200690155
Subject(s) - catalysis , chemistry , high resolution transmission electron microscopy , particle size , colloidal gold , chemical engineering , particle (ecology) , nanoparticle , precipitation , deposition (geology) , inorganic chemistry , nuclear chemistry , transmission electron microscopy , organic chemistry , paleontology , oceanography , physics , sediment , meteorology , engineering , biology , geology
The relationship between particle size and catalytic activity of gold nanoparticle catalysts with γ ‐Al 2 O 3 as support has been investigated. The catalysts were prepared via the gold sol with different particle sizes by micelle method, and their structures were characterized by HRTEM and XRD, respectively. Furthermore, the catalytic activities were tested by CO oxidation. Experimental results showed that the catalytic activity became much weaker when gold particles were increased from 3.2 to 6.6 nm. Additionally, the particle size was also a key factor to govern catalytic activity with regard to gold supported on TiO 2 prepared by the methods of deposition‐precipitation.