Studies On Rh-based Catalyst For Conversion Of Syngas To C₂Oxygenates

Rh based catalyst supported on SiO2-TiO2mixed oxide has more CO adsorption amount and excellent capability of CO dissociation. SiO2-TiO2mixed oxide improved the Rh dispersion and thus led to increment of Rh+sites, which led to more CO insertion active site. Moreover, moderate ability of hydrogenation and interaction of Rh-Mn was obtained on SiO2-TiO2catalyst. All these led to the best catalytic performance toward C2oxygenates systhysis over SiO2-TiO2supported Rh based catalyst.Compared with SiO2supported Rh based catalyst, SiO2-ZrO2supported Rh based catalyst improved the catalytic performance toward C2oxygenates synthsis. A new adsorbed CO species, in which C-O weakened, were obtained on SiO2-ZrO2catalysts, which contributed to CO dissociation. SiO2-ZrO2mixed oxide could stabilized Rh+ions and owned moderate ability of hydrogenation and interaction of Rh-Mn. Rh dispersion of RML/SZ(1:3) was the optimal, which led to the best catalytic activity toward C2oxygenates synthysis.Among the TiO2supported catalysts with same crystallite size of TiO2, the catalytic performance of rutile TiO2supported catalysts was better than that of anatase one. P25supported catalysts with anatase-rutile mixed phase exhibited the best catalytic performance. TiO2supported catalysts with different crystalling phase differed in interaction strength between metal and support, which led to different interaction strength between Rh and Mn. With the highest Rh dispersion and moderate interaction of Rh-Mn, TiO2(P25) supported catalysts showed the best catalytic performance.