No abstract

Silica-supported bismuth molybdate catalysts have been prepared by impregnation, structurally characterized and examined as improved catalysts for the selective oxidation of propylene to acrolein. Catalysts with a wide range of loadings (from 10 to 90 wt%) of beta bismuth molybdate (b-Bi 2 Mo 2 O 9 ) were studied to provide a better understanding about the distribution of active sites, and to elucidate the role of lattice oxygen in the reaction. The catalyst containing 50 wt% of beta bismuth molybdate on SiO 2 was found to possess good distribution of active sites and sufficiently high lattice oxygen, which resulted in an extraordinary increase of the catalytic activity.

Directly conversion of CO2 to propanol using C2H4 and H2 had succeeded over Au/SiO2 catalyst in one reactor mode. However, application of new dual-reactor concept enhaned the catalytic activity strongly by using two saparated reactors. To this details, a first reactor is used to convert CO2 to CO through the reverse water gas shift (RWGS) reaction, consecutive hydroformylation of C2H4 with resulting CO and H2 to propanal and finally the hydrogenation of propanal to propanol takes place in a second reactor at a different temperature. The selectivity to oxo products (propanol and propanal) increased from 15% up to 60% while yeild of oxo products improved from 7% to 15% in comparison with the previous publications.