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- W4237135814 abstract "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." @default.
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- W4237135814 date "2000-03-01" @default.
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- W4237135814 title "Effects of Oxidation/Reduction and Oxychlorination/Reduction Cycles on CO Adsorption by Pt–Re/Al2O3 Catalysts" @default.
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- W4237135814 doi "https://doi.org/10.1006/jcat.1999.2730" @default.
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