Unique Catalytic Performance of Supported Cold Nanoparticles in Oxidation

Unique Catalytic Performance of Supported Cold Nanoparticles in Oxidation 

Yunbo Yu, Jiahui Huang, Tamao Ishida, and Masatake Haruta 

The number of papers dealing with catalysis by Au was more or less than 5 a year in the 1980s but reached 700 in 2005 and 600 in 2006. There are three major streams in current research activities on Au catalysts expansion of applications, especially to liquid-phase organic reactions [4], discussion on the active states of Au [5], and exploration of new forms of Au catalysts. The last stream has emerged recently and is represented by Au submicron tube [6], nanoporous Au [7, 8], polymer stabilized Au colloids [9] and Au on solid polymers [10, 11], which in turn provide valuable information for determining what states of Au are surprisingly active and selective. 

The oxidation of CO is the simplest reaction and has been the most intensively studied since Langmuir first presented a theory of adsorption and catalysis for this reaction [13]. Supported Au NPs such as Au/Ti02, Au/Fc203 and AU/C03O4 are extraordinarily active in CO oxidation, even at 200 K, and are much more active than the other noble metals catalysts at temperatures below 400 K [14—16]. Gold clusters composed of several atoms can promote the reaction between CO and O2 to form CO2 at as low as 40 K [17]. Most recently, Lahr and Ceyer [18] have extended the temperature range at which the activity for CO oxidation is observed to as low as 70 K by using an Au/Ni surface alloy. 

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TOO 3 Unique Catalytic Performance of Supported Cold Nanoparticles in Oxidation 3.4.3... 

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