Selective catalytic hydrogenation of CO2 on bimetallic RuCu/Al2O3
Selective catalytic hydrogenation of greenhouse gas CO2 to synthesis gas has important environmental significance and economic value.In this paper,bimetallic Ru-Cu catalysts were prepared by the microemulsion and impregnation methods,respectively.The catalysts were characterized and their catalytic performances for CO2 hydrogenation were evaluated.The characterization results showed that in the catalyst prepared by the microemulsion method(ME-0.2Ru1Cu/Al2O3),Ru and Cu were in close contact in the Ru-Cu nanoparticles with uniform size,while separate Ru and Cu nanoparticles were identified in the catalyst prepared by the impregnation method(im-0.2Ru1Cu/Al2O3).The results of catalytic CO2 hydrogenation showed that doping Ru in Cu resulted in enhanced catalytic activity but reduced CO selectivity.The bimetallic catalysts prepared by the microemulsion method showed higher CO selectivity than those by the impregnation method.For the catalysts with identical Ru/Cu ratio,their activities increased with metal loading amount,while the CO selectivity did not decrease significantly.
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