Title of article :
Propene epoxidation with O2 and H2: Identification of the most active gold clusters
Author/Authors :
Jiahui Huang، نويسنده , , Enrique Lima، نويسنده , , Tomoki Akita، نويسنده , , Ariel Guzm?n، نويسنده , , Caixia Qi، نويسنده , , Takashi Takei، نويسنده , , Masatake Haruta، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Pages :
8
From page :
8
To page :
15
Abstract :
Gold was deposited on alkaline-treated TS-1 (TS-1-Na1) to prepare Au/TS-1-Na1(DP) by deposition–precipitation (DP) and Au/TS-1-Na1(SG) by solid grinding (SG). 129Xe NMR technique has detected that tiny Au clusters have been incorporated into the microporous channels of Au/TS-1-Na1(DP), while they were absent inside the microporous channels of Au/TS-1-Na1(SG). On the other hand, HAADF-STEM observation showed that the amount of Au clusters (1.0–2.0 nm) over the exterior surfaces was much larger in Au/TS-1-Na1(SG) than in Au/TS-1-Na1(DP). In propene epoxidation with O2 and H2, Au/TS-1-Na1(SG) exhibited much higher PO formation rate (127 gPO image h−1) than Au/TS-1-Na1(DP) (74 gPO image h−1), indicating that Au clusters with diameters of 1.0–2.0 nm are more active for PO synthesis than tiny Au clusters incorporated inside the microporous channels.
Keywords :
Catalysis , Nanoparticles , Pt/Ru , Hydrogenation , Ethanol reduction , Ortho-chloroaniline , ortho-Chloronitrobenzene
Journal title :
Journal of Catalysis
Serial Year :
2011
Journal title :
Journal of Catalysis
Record number :
1226158
Link To Document :
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