Study On Slurry Bed Synthesis Of Low Carbon Alcohol Over Cu Based Catalyst By Complete Liquid-phase Technology

Methanol and ethanol both are the basic chemical raw materials.They are widely used.They can be used to produce a range of organic chemical products.In recent years,with the increase in oil demand,oil prices rise rapidly.To seek alternative energy is extremely urgent.Thus,methanol fuel and ethanol fuel were developed because of theirs high oxygen content.Their joining will make gasoline burning more completely and reduce the emissions of harmful substances,in order to save energy and protect environment.About the synthesis gas to low carbon alcohols,there are many studies.Our group prepared Cu-based catalysts by self-developed fully liquid methods for slurry bed of synthesis gas to low carbon alcohols（mainly to methanol and ethanol）.In this paper,CuO/ZnO/TiO₂ and CuO/ZnO/Al2O₃ catalyst were prepared by the fully liquid meyhods.The effect of the amount of tetrabutyl titanate in the CuO/ZnO/TiO₂ catalyst was investigated.The effect of adding different potassium and different aluminum isopropoxide’s treatment on the CuO/ZnO/Al2O₃ catalyst was investigated.At the same time,we use XRD,H2-TPR,BET means to characterize the phase,the reducing ability and the pore structure of the catalysts.On the work done above,the main conclusions are drawn as follows:1.In the preparation of CuO/ZnO/Al2O₃ catalyst by the complete liquid-phase technology,the aluminum isopropoxide is a key factor.A different approach will affect the structure and performance of the catalyst.The catalyst with the aluminum isopropoxide which was placed in the 50℃ dryer oven for 24 h has the highest activity and better selectivity of methanol and ethanol.At the same time,no deactivation occurs.This catalyst has the smaller Cu0 grain size、largest area of reduction peak、largeet surface area and most relative concentration of the pore size distribution.2.Replacing Al2O₃ with TiO₂ to weaken catalyst’s acidity,the result showsthat CuO/ZnO/TiO₂ catalyst has a relatively higher catalytic activity and relatively higher selectivity of ethanol than CuO/ZnO/Al2O₃.In the CuO/ZnO/TiO₂ catalyst,the amount of tetrabutyl titanate increases,the grain size of CuO decreases,the peak temperature of the reduction is gradually decreased,so the selectivity of ethanol increases relatively.3.The research of introduction alkali metal shows that different potassium additives to the CuO/ZnO/Al2O₃ catalyst,its influence to the catalyst’s structure and properties is different.In the CuO/ZnO/Al2O₃ catalysts with different potassium,the catalyst with potassium acetate has a relatively high activity and a relatively better selectivity of methanol and ethanol.