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- W1966458310 abstract "Hydrogen-to-metal (HM) ratios exceeding unity for Pt and Rh and exceeding 2 for Ir were measured for highly dispersed Pt, Rh, and Ir catalysts supported on Al2O3 and SiO2. Since the coordination of hydrogen to metal atoms is unknown for such highly dispersed catalysts, the metal surface area of these catalysts cannot be calculated from the hydrogen chemisorption values. Therefore EXAFS (extended X-ray absorption fine structure) measurements were performed to determine the metal particle size and thereby to calibrate hydrogen chemisorption results. The HM ratio determined by hydrogen chemisorption is a linear function of the average metal coordination number determined by EXAFS. This linear relationship is independent of support but varies with the metal with the HM ratio increasing in the order Pt < Rh < Ir. Several hypotheses for the high HM values are discussed. Spillover and subsurface hydrogen are excluded as explanations and only multiple adsorption of hydrogen on metal surface atoms is shown to be capable of explaining all experimental observations. The HMsurface stoichiometry differs among Pt, Rh, and Ir in the order HPt < HRh < HIr, analogous to the order of stability of corresponding metal polyhydride complexes and of theoretical expectation." @default.
- W1966458310 created "2016-06-24" @default.
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- W1966458310 date "1987-05-01" @default.
- W1966458310 modified "2023-10-17" @default.
- W1966458310 title "Determination of metal particle size of highly dispersed Rh, Ir, and Pt catalysts by hydrogen chemisorption and EXAFS" @default.
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- W1966458310 doi "https://doi.org/10.1016/0021-9517(87)90005-4" @default.
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