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Title: Cyclohexane dehydrogenation catalyzed by bimetallic Au-Pt(111) single-crystal surfaces

Abstract

Cyclohexane dehydrogenation was investigated using two-phase, epitaxial Au on Pt(111) single crystal surfaces and single-phase Au-Pt(111) surface alloys as catalysts, with 20-mbar cyclohexane and 133-mbar H/sub 2/ at 573 K. Benzene production was found to be strongly enhanced by Au, reaching a maximum at a surface composition of 50 atom% Au and declining thereafter. The clean Pt(111) crystal face did not produce detectable amounts of cyclohexene, its formation by the single crystal being completely attributable to the crystal edges. The addition of gold to the Pt(111) surface also induced production of cyclohexene. Surfaces containing about 90 atom% Au were the most active. In both cases, the effects were similar for epitaxial and alloy surfaces, but the latter usually gave larger enhancements. The enhancement by Au of the cyclohexane dehydrogenation to benzene is interpreted as a reduction of the product poisoning of Pt sites by benzene. This, and the observation that only Au containing Pt(111) surfaces produced cyclohexene are both explained by ensemble size effects. 26 references, 2 figures.

Authors:
;
Publication Date:
Research Org.:
Univ. of California, Berkeley
OSTI Identifier:
6039356
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Journal Article
Journal Name:
J. Catal.; (United States)
Additional Journal Information:
Journal Volume: 89:1
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; CYCLOHEXANE; DEHYDROGENATION; GOLD ALLOYS; CATALYTIC EFFECTS; PLATINUM ALLOYS; BENZENE; CHEMICAL REACTION KINETICS; CHEMICAL REACTION YIELD; EXPERIMENTAL DATA; HIGH TEMPERATURE; LIGANDS; SURFACE PROPERTIES; ALKANES; ALLOYS; AROMATICS; CHEMICAL REACTIONS; CYCLOALKANES; DATA; HYDROCARBONS; INFORMATION; KINETICS; NUMERICAL DATA; ORGANIC COMPOUNDS; PLATINUM METAL ALLOYS; REACTION KINETICS; YIELDS; 020400* - Petroleum- Processing

Citation Formats

Sachtler, J W.A., and Somorjai, G A. Cyclohexane dehydrogenation catalyzed by bimetallic Au-Pt(111) single-crystal surfaces. United States: N. p., 1984. Web. doi:10.1016/0021-9517(84)90277-X.
Sachtler, J W.A., & Somorjai, G A. Cyclohexane dehydrogenation catalyzed by bimetallic Au-Pt(111) single-crystal surfaces. United States. https://doi.org/10.1016/0021-9517(84)90277-X
Sachtler, J W.A., and Somorjai, G A. 1984. "Cyclohexane dehydrogenation catalyzed by bimetallic Au-Pt(111) single-crystal surfaces". United States. https://doi.org/10.1016/0021-9517(84)90277-X.
@article{osti_6039356,
title = {Cyclohexane dehydrogenation catalyzed by bimetallic Au-Pt(111) single-crystal surfaces},
author = {Sachtler, J W.A. and Somorjai, G A},
abstractNote = {Cyclohexane dehydrogenation was investigated using two-phase, epitaxial Au on Pt(111) single crystal surfaces and single-phase Au-Pt(111) surface alloys as catalysts, with 20-mbar cyclohexane and 133-mbar H/sub 2/ at 573 K. Benzene production was found to be strongly enhanced by Au, reaching a maximum at a surface composition of 50 atom% Au and declining thereafter. The clean Pt(111) crystal face did not produce detectable amounts of cyclohexene, its formation by the single crystal being completely attributable to the crystal edges. The addition of gold to the Pt(111) surface also induced production of cyclohexene. Surfaces containing about 90 atom% Au were the most active. In both cases, the effects were similar for epitaxial and alloy surfaces, but the latter usually gave larger enhancements. The enhancement by Au of the cyclohexane dehydrogenation to benzene is interpreted as a reduction of the product poisoning of Pt sites by benzene. This, and the observation that only Au containing Pt(111) surfaces produced cyclohexene are both explained by ensemble size effects. 26 references, 2 figures.},
doi = {10.1016/0021-9517(84)90277-X},
url = {https://www.osti.gov/biblio/6039356}, journal = {J. Catal.; (United States)},
number = ,
volume = 89:1,
place = {United States},
year = {Sat Sep 01 00:00:00 EDT 1984},
month = {Sat Sep 01 00:00:00 EDT 1984}
}