Effects of Oxidation/Reduction and Oxychlorination/Reduction Cycles on CO Adsorption by Pt–Re/Al2O3 Catalysts

Infrared spectra of CO adsorbed on Pt–Re/Al2O3 after individual steps in sequences of oxidation, oxychlorination, and reduction treatments are compared with corresponding spectra for Pt/Al2O3 and Re/Al2O3, and with H2 chemisorption data. Chloro-Pt and oxychloro-Pt complexes were formed independe...

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Main Authors: Chong, Fai Kait, Anderson, James A., Rochester, Colin H.
Format: Citation Index Journal
Published: Elesevier 2000
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Online Access:http://eprints.utp.edu.my/4811/1/Effects-of-oxidation-reduction-and-oxychlorination-reduction-cycles-on-CO-adsorption-by-Pt-Re-Al2O3-catalysts_2000_Journal-of-Catalysis.pdf
http://eprints.utp.edu.my/4811/
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spelling my.utp.eprints.48112017-01-19T08:27:43Z Effects of Oxidation/Reduction and Oxychlorination/Reduction Cycles on CO Adsorption by Pt–Re/Al2O3 Catalysts Chong, Fai Kait Anderson, James A. Rochester, Colin H. QD Chemistry Infrared spectra of CO adsorbed on Pt–Re/Al2O3 after individual steps in sequences of oxidation, oxychlorination, and reduction treatments are compared with corresponding spectra for Pt/Al2O3 and Re/Al2O3, and with H2 chemisorption data. Chloro-Pt and oxychloro-Pt complexes were formed independently of the presence of Re during oxychlorination and contributed to a Cl-dependent enhanced dispersion of Pt in Pt–Re/Al2O3. After a given treatment the dispersions of Pt in Pt/Al2O3 and Pt–Re/Al2O3 were similar, but the H2 uptakes were considerably decreased by the addition of Re. In general, reduced Pt–Re/Al2O3 contained very small bimetallic particles with Re surface enrichment. Small ensembles of high coordination Pt0 atoms were retained, although Re atoms may have been located at both ensemble and edge sites. Surface sintering after repeated oxidation/reduction cycles led to an enhanced coverage of bimetallic particles by Re, the effect being reversed by oxychlorination/ reduction cycles. Elesevier 2000 Citation Index Journal PeerReviewed application/pdf http://eprints.utp.edu.my/4811/1/Effects-of-oxidation-reduction-and-oxychlorination-reduction-cycles-on-CO-adsorption-by-Pt-Re-Al2O3-catalysts_2000_Journal-of-Catalysis.pdf Chong, Fai Kait and Anderson, James A. and Rochester, Colin H. (2000) Effects of Oxidation/Reduction and Oxychlorination/Reduction Cycles on CO Adsorption by Pt–Re/Al2O3 Catalysts. [Citation Index Journal] http://eprints.utp.edu.my/4811/
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
topic QD Chemistry
spellingShingle QD Chemistry
Chong, Fai Kait
Anderson, James A.
Rochester, Colin H.
Effects of Oxidation/Reduction and Oxychlorination/Reduction Cycles on CO Adsorption by Pt–Re/Al2O3 Catalysts
description Infrared spectra of CO adsorbed on Pt–Re/Al2O3 after individual steps in sequences of oxidation, oxychlorination, and reduction treatments are compared with corresponding spectra for Pt/Al2O3 and Re/Al2O3, and with H2 chemisorption data. Chloro-Pt and oxychloro-Pt complexes were formed independently of the presence of Re during oxychlorination and contributed to a Cl-dependent enhanced dispersion of Pt in Pt–Re/Al2O3. After a given treatment the dispersions of Pt in Pt/Al2O3 and Pt–Re/Al2O3 were similar, but the H2 uptakes were considerably decreased by the addition of Re. In general, reduced Pt–Re/Al2O3 contained very small bimetallic particles with Re surface enrichment. Small ensembles of high coordination Pt0 atoms were retained, although Re atoms may have been located at both ensemble and edge sites. Surface sintering after repeated oxidation/reduction cycles led to an enhanced coverage of bimetallic particles by Re, the effect being reversed by oxychlorination/ reduction cycles.
format Citation Index Journal
author Chong, Fai Kait
Anderson, James A.
Rochester, Colin H.
author_facet Chong, Fai Kait
Anderson, James A.
Rochester, Colin H.
author_sort Chong, Fai Kait
title Effects of Oxidation/Reduction and Oxychlorination/Reduction Cycles on CO Adsorption by Pt–Re/Al2O3 Catalysts
title_short Effects of Oxidation/Reduction and Oxychlorination/Reduction Cycles on CO Adsorption by Pt–Re/Al2O3 Catalysts
title_full Effects of Oxidation/Reduction and Oxychlorination/Reduction Cycles on CO Adsorption by Pt–Re/Al2O3 Catalysts
title_fullStr Effects of Oxidation/Reduction and Oxychlorination/Reduction Cycles on CO Adsorption by Pt–Re/Al2O3 Catalysts
title_full_unstemmed Effects of Oxidation/Reduction and Oxychlorination/Reduction Cycles on CO Adsorption by Pt–Re/Al2O3 Catalysts
title_sort effects of oxidation/reduction and oxychlorination/reduction cycles on co adsorption by pt–re/al2o3 catalysts
publisher Elesevier
publishDate 2000
url http://eprints.utp.edu.my/4811/1/Effects-of-oxidation-reduction-and-oxychlorination-reduction-cycles-on-CO-adsorption-by-Pt-Re-Al2O3-catalysts_2000_Journal-of-Catalysis.pdf
http://eprints.utp.edu.my/4811/
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