【摘 要】
：
Pt/Al2O3 catalysts with smaller size of Pt nanoparticles were prepared by ethylene glycol reduction method in two different way and their oxidation activities for three typical VOCs (volatile organic com-pounds) were evaluated.The catalyst prepared by fir
【机 构】
：
Institute of Catalysis,Zhejiang University,Hangzhou 310028,China
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Pt/Al2O3 catalysts with smaller size of Pt nanoparticles were prepared by ethylene glycol reduction method in two different way and their oxidation activities for three typical VOCs (volatile organic com-pounds) were evaluated.The catalyst prepared by first adsorption and then reduction procedure is denoted as L-Pt/Al2O3 while the catalyst prepared by first reduction and then loading procedure is defined as R-Pt/Al2O3.The results show that L-Pt/Al2O3 with the stronger interaction between Pt species and Al2O3 exhibit smaller size of Pt nanoparticles and favorable thermal stability compared with R-Pt/Al2O3.L-Pt/Al2O3 is favor of the formation of more adsorbed oxygen species and more Pt2+ species,result-ing in high catalytic activity for benzene and ethyl acetate oxidation.However,R-Pt/Al2O3 catalysts with higher proportion of Pt0/Pt2+ and bigger size of Pt particles exhibits higher catalytic activity for n-hexane oxidation.Pt particles in R-Pt/Al2O3 were aggregated much more serious than that in L-Pt/Al2O3 at the same calcination temperature.The Pt particles supported on Al2O3 with ～10 nm show the best catalytic activity for n-hexane oxidation.
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