Propene epoxidation with O2 and H2: Identification of the most active gold clusters

Jiahui Huang; Enrique Lima; Tomoki Akita; Ariel Guzmán; Caixia Qi; Takashi Takei; Masatake Haruta

doi:10.1016/j.jcat.2010.11.012

Propene epoxidation with O₂ and H₂: Identification of the most active gold clusters

Jiahui Huang, Enrique Lima, Tomoki Akita, Ariel Guzmán, Caixia Qi, Takashi Takei, Masatake Haruta

Research output: Contribution to journal › Article › peer-review

112 Scopus citations

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 g_PO kgcat-1 h^-1) than Au/TS-1-Na1(DP) (74 g_PO kgcat-1 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.

Original language	English
Pages (from-to)	8-15
Number of pages	8
Journal	Journal of Catalysis
Volume	278
Issue number	1
DOIs	https://doi.org/10.1016/j.jcat.2010.11.012
State	Published - 14 Feb 2011
Externally published	Yes

Keywords

Alkaline-treated TS-1
Gold clusters
O/H mixture
Propene epoxidation
Xe NMR

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10.1016/j.jcat.2010.11.012

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title = "Propene epoxidation with O2 and H2: Identification of the most active gold clusters",

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 kgcat-1 h-1) than Au/TS-1-Na1(DP) (74 gPO kgcat-1 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 = "Alkaline-treated TS-1, Gold clusters, O/H mixture, Propene epoxidation, Xe NMR",

author = "Jiahui Huang and Enrique Lima and Tomoki Akita and Ariel Guzm{\'a}n and Caixia Qi and Takashi Takei and Masatake Haruta",

note = "Funding Information: Thanks from E. Lima are due to Conacyt (Consejo Nacional de Ciencia y Tecnologia, Mexico) for Grant 24676, 101319 and PAPIIT-UNAM IN107110.",

year = "2011",

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doi = "10.1016/j.jcat.2010.11.012",

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T1 - Propene epoxidation with O2 and H2

T2 - Identification of the most active gold clusters

AU - Huang, Jiahui

AU - Lima, Enrique

AU - Akita, Tomoki

AU - Guzmán, Ariel

AU - Qi, Caixia

AU - Takei, Takashi

AU - Haruta, Masatake

N1 - Funding Information: Thanks from E. Lima are due to Conacyt (Consejo Nacional de Ciencia y Tecnologia, Mexico) for Grant 24676, 101319 and PAPIIT-UNAM IN107110.

PY - 2011/2/14

Y1 - 2011/2/14

N2 - 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 kgcat-1 h-1) than Au/TS-1-Na1(DP) (74 gPO kgcat-1 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.

AB - 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 kgcat-1 h-1) than Au/TS-1-Na1(DP) (74 gPO kgcat-1 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.

KW - Alkaline-treated TS-1

KW - Gold clusters

KW - O/H mixture

KW - Propene epoxidation

KW - Xe NMR

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DO - 10.1016/j.jcat.2010.11.012

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EP - 15

JO - Journal of Catalysis

JF - Journal of Catalysis

IS - 1

ER -

Propene epoxidation with O₂ and H₂: Identification of the most active gold clusters

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Keywords

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