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• W2089664729 abstract "The adsorption of [Rh(CO)2Cl]2, on TiO2(110) has been studied using FT-RAIRS ans XPS, and at 300 K results in dissociation to produce adsorbed chlorine and the rhodium gem-dicarbonyl species Rh(CO)2. The gem-dicarbonyl is characterised in the IR by vsym (CO) and vasym(CO) observed at 2112 and 2028 cm−1, respectively. The gem-dicarbonyl decomposes through loss of CO at 450–500 K to produce metallic rhodium particles, Rh0x. Following heating to 500 K, re-exposure of the surface to ∼ 106 L of CO gives rise to the partial re-generation of the gem-dicarbonyl species, and in addition to the adsorption of linearly bound CO on Rh0x, with v(CO) observed at 2064 cm−1. Desorption of the linear bound species from Rh0xtakes place at 550–600 K. re-generation of the gem-dicarbonyl species also takes place on a surface where adsorbed chlorine has been removed using water adsorption/desorption cycles, but does not appear to involve surface hydroxyl groups or dissociative adsorption of CO. If the surface is heated to 800 K it appears that larger metal clusters are formed which do not allow the regeneration of the gem-dicarbonyl following exposure to ∼ 106 L of CO. Adsorption of CO on these larger particles of Rh0x gives rise to the linear CO species with v(CO) at 2064-2055 cm−1, and shoulders at 2030 and 2010 cm−1. In addition a broad band at 1870 cm−1 is observed which is associated with v(CO) of the bridge bound species." @default.
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• W2089664729 date "1992-12-01" @default.
• W2089664729 modified "2023-10-16" @default.
• W2089664729 title "Adsorbate induced phase changes of rhodium on TiO2(110)" @default.
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• W2089664729 doi "https://doi.org/10.1016/0039-6028(92)90729-p" @default.
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