Synthesis of C2-oxygenates from syngas over Rh-based catalyst supported on SiO2, TiO2 and SiO2–TiO2 mixed oxide

SiO2, TiO2 and SiO2–TiO2 mixed oxide were synthesized by sol–gel method and used as supports for Rh-based catalysts. The effect of support on the performance of Rh-based catalysts for C2-oxygenates synthesis from syngas was investigated by XRD, N2 adsorption-desorption, FT-IR, H2-TPD, H2-TPR and TPSR techniques. The results indicated that SiO2–TiO2 supported catalyst had higher dispersion of Rh and thus more Rh+ sites, better capability for CO adsorption and dissociation, and moderate ability for hydrogenation. As a result, SiO2–TiO2 supported Rh-based catalyst exhibited higher activity and C2 oxygenates selectivity compared with counterparts supported on TiO2 and SiO2.

Among Rh-based catalysts supported SiO2, TiO2 and SiO2–TiO2 mixed oxide, SiO2–TiO2 supported catalyst exhibits best catalytic activity toward C2 oxygenates.Figure optionsDownload as PowerPoint slideHighlights
► SiO2–TiO2 supported catalyst is more effective for the formation of C2 oxygenates.
► SiO2–TiO2 supported catalyst has higher dispersion of Rh which leads to more Rh+ sites.
► SiO2–TiO2 supported catalyst has excellent capability for CO dissociation.
► SiO2–TiO2 supported catalyst has moderate ability for hydrogenation.