Sub-10 nm Platinum Nanocrystals with Size and Shape Control: Catalytic Study for Ethylene and Pyrrole Hydrogenation

被引：449

作者：

Tsung, Chia-Kuang ^{[1
,2
,3
]}

Kuhn, John N. ^{[1
,2
,3
]}

Huang, Wenyu ^{[1
,2
,3
]}

Aliaga, Cesar ^{[1
,2
,3
]}

Hung, Ling-I ^{[1
,2
,3
,4
,5
]}

Somorjai, Gabor A. ^{[1
,2
,3
]}

Yang, Peidong ^{[1
,2
,3
]}

机构：

[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA

[4] Ind Technol Res Inst, Mat Lab, Hsinchu 310, Taiwan

[5] Ind Technol Res Inst, Chem Lab, Hsinchu 310, Taiwan

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2009年 / 131卷 / 16期

关键词：

GENERATION VIBRATIONAL SPECTROSCOPY; SINGLE-CRYSTAL SURFACES; WET CHEMICAL SYNTHESIS; HIGH-PRESSURES; BENZENE HYDROGENATION; C-6; HYDROCARBONS; NANOPARTICLES; PT(111); ADSORPTION; MONODISPERSE;

D O I：

10.1021/ja809936n

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Platinum nanocubes and nanopolyhedra with tunable size from 5 to 9 nm were synthesized by controlling the reducing rate of metal precursor ions in a one-pot polyol synthesis. A two-stage process is proposed for the simultaneous control of size and shape. In the first stage, the oxidation state of the metal ion precursors determined the nucleation rate and consequently the number of nuclei. The reaction temperature controlled the shape in the second stage by regulation of the growth kinetics. These well-defined nanocrystals were loaded into MCF-17 mesoporous silica for examination of catalytic properties. Pt loadings and dispersions of the supported catalysts were determined by elemental analysis (ICP-MS) and H-2 chemisorption isotherms, respectively. Ethylene hydrogenation rates over the Pt nanocrystals were independent of both size and shape and comparable to Pt single crystals. For pyrrole hydrogenation, the nanocubes enhanced ring-opening ability and thus showed a higher selectivity to n-butylamine as compared to nanopolyhedra.

引用

页码：5816 / 5822

页数：7

共 43 条

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