Boron-doped Carbon aerogels supported Cu catalyst for selective hydrogenation of dimethyl oxalate
The Carbon aerogels (CA) was applied to synthesize Cu/CA catalysts by the impregnation method and the catalysts with boron-doped CA supports were systematically characterized and evaluated in the hydrogenation of dimethyl oxalate (DMO). The Cu/xB-CA catalyst with 25wt% copper showed 100% DMO conversion and the highest ethylene glycol(EG) or methyl glycolate(MG) selectivity of 70 % at 230°C, as well a lifetime of over 150h. The characterization results disclosed the reason why the performance of catalysts could be tuned facilely by changing the amount of boron doping, which effectively influenced the interrelation between copper and CA, the acidity and alkalinity of catalysts and the Cu dispersion. Both the original carbon aerogels and that promoted with little B could provide larger surface area and high dispersion of metal. The species, size of copper particle and the ratio of Cu+/(Cu++Cu0) could be regulated by boron doping, thus adjust the type of hydrogenation products.