In situ FTIR study of CO–H2reactions over RH/TiO2catalysts at high pressure and temperature
- 1 January 1994
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 90 (24) , 3699-3709
- https://doi.org/10.1039/ft9949003699
Abstract
IR spectra are reported of Rh/TiO2in situ in CO–H2 mixtures (1 : 14, 1 : 2, 2 : 1 and 14 : 1 ratios) at high pressure (0.3 or 1.5 MN m–2) and temperature (473, 523 or 553 K). The spectra allowed the surface hydroxy groups and water on TiO2, CO adsorbed on Rh and gaseous CO, CO2 and CH4 to be monitored together with OMe–, OEt–, HCO2 – and MeCO2 – species on TiO2 and surface CH2-containing hydrocarbon. Titania alone catalysed the CO–H2 reactions but the dominant products with Rh/TiO2 were formed by catalysis over Rh followed by spillover of oxygenates onto the support. Surface carbonyl and carbonyl hydride complexes of rhodium, present during the reaction, are believed important, possibly as precursor intermediate species influencing the catalytic selectivity for methanol, ethanol, methane and higher linear hydrocarbon production.Keywords
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