Novel Carrier To Perparing CuCo-Based Catalyst To Synthesize Ethanol

Catalytic conversion of syngas to higher alcohols is generally recognized as a promising route for providing clean fuels and chemical feedstocks in view of environmental protection and resources utilization.This paper based on Cu-Co catalyst, used nanocomposite of SiO2 and CNTs as carrier, utilized pyrogallic acid to modify the composite carrier, prepared a series of new ethanol and higher alcohol catalyst by syngas transformation, and deeply studied the catalyst by characterization method such as SEM,XRD,TPR and XPS.And the author compared and evaluated the catalytic activity of the CO hydroconversion into ethanol and higher alcohol, and found that the addition of carbon nanotube and pyrogallic acid can improve the reaction activity and increase the yield and selectivity of ethanol and higher alcohol. Under the reaction conditions of pressure 5MPa, temperature 573K, H2/CO=1, reactions conversion of the catalyst can reach 39% by modifying carbon nanotube and pyrogallic acid, ethanol above higher alcohol's selectivity improved from 57% to 73%, space time yield of the corresponding total alcohol (C1-5 alcohol) can reach 237 g-(kg-h)-1. By analysis of XRD result, this may be related to the increasing of CuxCo3-xO4.The author inspected the influence of H2/CO ratio in the pyrogallic acid promoting CuCo/SiO2-CNTs catalysts performance. The experiment showed that increasing H2/CO contributed to the reaction of CO hydrogenation activity, to generating more alcohols and hydrocarbons and also to the selectivity of CH4, but bad for the generation of liquid senior hydrocarbon and higher alcohol.This paper studied the influence of Co/Cu ratio in the catalyst.When the Co/Cu ratio is one, conversion rate of the reaction is the highest and H2/CO ratio is the smallest. In this condition, the reaction exhibited better selectivity of higher alcohol, reaching 73%, further explained that the selectivity of higher alcohols with Cu-Co interactions is directly related.