Abstract
Ethanol synthesis by catalytic hydrogenation of CO 2 was carried out over RhFe SiO 2 catalysts prepared by coimpregnation. The added amount of Fe influenced ethanol selectivity as well as CO 2 conversion in the range Fe Rh = 0–3 . Product selectivity was correlated with %Fe 0 evaluated by XPS. The ethanol selectivity was correlated with the amount of bridged-CO adsorbed species evaluated by in situ FT-IR. It has been suggested that Fe changed the electronic states of Rh and that Fe 0 promoted methanation and prevented ethanol formation, as well as CO and methanol formation. An ethanol selectivity of 16.0% and a CO 2 conversion of 26.7% were obtained at 5 MPa and 533 K in a flow of H 2CO 2 premixed gas ( H 2 CO 2 = 3 ) with a flow rate of 100 cm 3/min over 5 wt% RhFe(1 : 2) SiO 2 catalysts.
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