Syngas reactions over Rh/SiO2 at high pressure and temperature studied by Fourier-transform infrared spectroscopy
- 1 January 1992
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 88 (6) , 879-886
- https://doi.org/10.1039/ft9928800879
Abstract
In situ FTIR spectra are reported of Rh/SiO2 at 473, 503, 523 and 553 K exposed to CO–H2 mixtures with CO : H2 ratios of 1 : 14 and 14 : 1 and a total pressure of 1.5 MN m–2 and also with a CO : H2 ratio of 1 : 2 and a total gas pressure of 0.3–5.0 MPa. The dominant detectable products were adsorbed CO on Rh, OMe and OEt groups on silica, CH4(g) and adsorbed higher hydrocarbon. Selectivities varied widely from ca. 100% to methoxy/methanol for the 1 : 14 ratio at 473 K to ca. 100% to higher hydrocarbon for the 14 : 1 ratio at 523 K. The dominant factor influencing selectivity was the CO : H2 ratio, although temperature, total gas pressure and time of reaction also had an effect. Selectivity to methanol rather than ethanol was favoured by low temperature and high pressure.Keywords
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