Promotion of au(en)2Cl3-derived au/fumed SiO 2 by treatment with KMnO4

Hongfeng Yin; Zhen Ma; Steven H. Overbury; Sheng Dai

doi:10.1021/jp800797t

Promotion of au(en)₂Cl₃-derived au/fumed SiO ₂ by treatment with KMnO₄

Hongfeng Yin, Zhen Ma, Steven H. Overbury, Sheng Dai

Chemical Sciences Division

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

28 Scopus citations

Abstract

A new method for the removal of organic ligands used in the synthesis of nanoparticle catalysts via solution-phase chemical oxidation and subsequent pretreatment at moderate temperatures was developed. This synthesis protocol is advantageous for the preparation of highly dispersed gold catalysts with minimum sintering. Highly active Au/SiO₂-based catalysts were prepared by treating Au(en)₂Cl₃-derived Au/fumed SiO₂ in strongly oxidative KMnO₄ solutions. The low-temperature activity in CO oxidation increased dramatically following the KMnO₄ treatment and subsequent thermal activation (including treatment in O₂-He at 300-600°C). The influences of the pH values of KMnO₄ solutions and temperatures of activation in O₂-He prior to the reaction testing were investigated, and relevant characterization using XRD, TEM, TG/DTG, SEM, EDX, and ICP-OES was conducted. The catalyst stability in CO oxidation was studied as a function of reaction time on stream. The origin of the promotional effect was discussed.

Original language	English
Pages (from-to)	8349-8358
Number of pages	10
Journal	Journal of Physical Chemistry C
Volume	112
Issue number	22
DOIs	https://doi.org/10.1021/jp800797t
State	Published - Jun 5 2008

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title = "Promotion of au(en)2Cl3-derived au/fumed SiO 2 by treatment with KMnO4",

abstract = "A new method for the removal of organic ligands used in the synthesis of nanoparticle catalysts via solution-phase chemical oxidation and subsequent pretreatment at moderate temperatures was developed. This synthesis protocol is advantageous for the preparation of highly dispersed gold catalysts with minimum sintering. Highly active Au/SiO2-based catalysts were prepared by treating Au(en)2Cl3-derived Au/fumed SiO2 in strongly oxidative KMnO4 solutions. The low-temperature activity in CO oxidation increased dramatically following the KMnO4 treatment and subsequent thermal activation (including treatment in O2-He at 300-600°C). The influences of the pH values of KMnO4 solutions and temperatures of activation in O2-He prior to the reaction testing were investigated, and relevant characterization using XRD, TEM, TG/DTG, SEM, EDX, and ICP-OES was conducted. The catalyst stability in CO oxidation was studied as a function of reaction time on stream. The origin of the promotional effect was discussed.",

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AU - Yin, Hongfeng

AU - Ma, Zhen

AU - Overbury, Steven H.

AU - Dai, Sheng

PY - 2008/6/5

Y1 - 2008/6/5

N2 - A new method for the removal of organic ligands used in the synthesis of nanoparticle catalysts via solution-phase chemical oxidation and subsequent pretreatment at moderate temperatures was developed. This synthesis protocol is advantageous for the preparation of highly dispersed gold catalysts with minimum sintering. Highly active Au/SiO2-based catalysts were prepared by treating Au(en)2Cl3-derived Au/fumed SiO2 in strongly oxidative KMnO4 solutions. The low-temperature activity in CO oxidation increased dramatically following the KMnO4 treatment and subsequent thermal activation (including treatment in O2-He at 300-600°C). The influences of the pH values of KMnO4 solutions and temperatures of activation in O2-He prior to the reaction testing were investigated, and relevant characterization using XRD, TEM, TG/DTG, SEM, EDX, and ICP-OES was conducted. The catalyst stability in CO oxidation was studied as a function of reaction time on stream. The origin of the promotional effect was discussed.

AB - A new method for the removal of organic ligands used in the synthesis of nanoparticle catalysts via solution-phase chemical oxidation and subsequent pretreatment at moderate temperatures was developed. This synthesis protocol is advantageous for the preparation of highly dispersed gold catalysts with minimum sintering. Highly active Au/SiO2-based catalysts were prepared by treating Au(en)2Cl3-derived Au/fumed SiO2 in strongly oxidative KMnO4 solutions. The low-temperature activity in CO oxidation increased dramatically following the KMnO4 treatment and subsequent thermal activation (including treatment in O2-He at 300-600°C). The influences of the pH values of KMnO4 solutions and temperatures of activation in O2-He prior to the reaction testing were investigated, and relevant characterization using XRD, TEM, TG/DTG, SEM, EDX, and ICP-OES was conducted. The catalyst stability in CO oxidation was studied as a function of reaction time on stream. The origin of the promotional effect was discussed.

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JO - Journal of Physical Chemistry C

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IS - 22

ER -

Promotion of au(en)₂Cl₃-derived au/fumed SiO ₂ by treatment with KMnO₄

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