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

Journal Article · Mon Mar 02 04:00:00 UTC 2009 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja809936n· OSTI ID:957406

Tsung, Chia-Kuang; Kuhn, John N; Huang, Wenyu; Aliaga, Cesar; Hung, Ling-I; Somorjai, Gabor A; Yang, Peidong

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.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: Nuclear Science Division
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 957406
• Report Number(s): LBNL-1883E
• Journal Information: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 16 Vol. 131; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CATALYSTS
CHEMISORPTION
ETHYLENE
HYDROGENATION
ISOTHERMS
KINETICS
MONOCRYSTALS
NUCLEATION
NUCLEI
PLATINUM
PRECURSOR
PYRROLES
REGULATIONS
SHAPE
SILICA
SYNTHESIS
Sub-10 nm Platinum Nanocrystals with Size and Shape Control
VALENCE