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

Abstract

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 H2 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.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Nuclear Science Division
OSTI Identifier:
957406
Report Number(s):
LBNL-1883E
Journal ID: ISSN 0002-7863; TRN: US201002%%973
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 131; Journal Issue: 16; Related Information: Journal Publication Date: 04/02/2009; Journal ID: ISSN 0002-7863
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CATALYSTS; CHEMISORPTION; ETHYLENE; HYDROGENATION; ISOTHERMS; KINETICS; MONOCRYSTALS; NUCLEATION; NUCLEI; PLATINUM; PRECURSOR; PYRROLES; REGULATIONS; SHAPE; SILICA; SYNTHESIS; VALENCE; Sub-10 nm Platinum Nanocrystals with Size and Shape Control

Citation Formats

Tsung, Chia-Kuang, Kuhn, John N, Huang, Wenyu, Aliaga, Cesar, Hung, Ling-I, Somorjai, Gabor A, and Yang, Peidong. Sub-10 nm Platinum Nanocrystals with Size and Shape Control: Catalytic Study for Ethylene and Pyrrole Hydrogenation. United States: N. p., 2009. Web. doi:10.1021/ja809936n.
Tsung, Chia-Kuang, Kuhn, John N, Huang, Wenyu, Aliaga, Cesar, Hung, Ling-I, Somorjai, Gabor A, & Yang, Peidong. Sub-10 nm Platinum Nanocrystals with Size and Shape Control: Catalytic Study for Ethylene and Pyrrole Hydrogenation. United States. doi:10.1021/ja809936n.
Tsung, Chia-Kuang, Kuhn, John N, Huang, Wenyu, Aliaga, Cesar, Hung, Ling-I, Somorjai, Gabor A, and Yang, Peidong. Mon . "Sub-10 nm Platinum Nanocrystals with Size and Shape Control: Catalytic Study for Ethylene and Pyrrole Hydrogenation". United States. doi:10.1021/ja809936n. https://www.osti.gov/servlets/purl/957406.
@article{osti_957406,
title = {Sub-10 nm Platinum Nanocrystals with Size and Shape Control: Catalytic Study for Ethylene and Pyrrole Hydrogenation},
author = {Tsung, Chia-Kuang and Kuhn, John N and Huang, Wenyu and Aliaga, Cesar and Hung, Ling-I and Somorjai, Gabor A and Yang, Peidong},
abstractNote = {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 H2 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.},
doi = {10.1021/ja809936n},
journal = {Journal of the American Chemical Society},
issn = {0002-7863},
number = 16,
volume = 131,
place = {United States},
year = {2009},
month = {3}
}