Effect Of CuZnX Catalysts For Ethanol Synthesis From CO Hydrogenation

Ethanol have received widespread attention as a clean resource,important chemical and energy products.Currently,the production of ethanol derives primarily from grain fermentation and petroleum based ethylene hydration,to some extent,which increased the burden of food in our country and exacerbated the dependence on foreign oil.It is known that ethanol synthesis from syngas is one of the hotspots in the research.Many advantages associated with the use of syngas are cheap and available,therefore,it can be obtained from abundant sources,such as coal,bio-mass,carbon containing waste fractions and natural gas.If the industry path can be achieved from syngas to ethanol,ethanol market will get more competitive in our country.In our previous studies,we have prepared the CuZnAl catalysts by complete liquid phase method.It is observed that Cu~+ species formed on the CuZnAl catalysts strongly enhance the ability of the system to synthesize ethanol,but the Cu~+ species are easy to be reduced during the reaction.In order to prepare the ethanol synthesis catalyst with excellent performance,this paper studied CuZn catalysts composited by a variety of different metals oxide,wherea strong interaction between metals oxide and active metals.this paper explored CuZn catalysts that composite with different single metals oxide and double metals oxide,respectively,and investigated the preparation method of CuZnTi catalyst which has ideal performance to synthesize ethanol.Some conclusions can be drawn from the combination of XRD,H2-TPR,NH3-TPD,XPS,BET with activity data:1.In the three catalysts systems,the CuZnTi catalyst changed the preparation conditions exhibits the best ethanol distribution and the ethanol distribution reach to 62.4 %,the CuZnAlZr catalyst has better conversion rate,up to 18 %.2.The higher reduction temperature the high temperature peaks,the stronger interaction,the higher ethanol distribution.3.The decrease of the acid of catalysts and surface copper species after reaction can be disadvantage to the catalytic activity.4.The copper crystallite size and texture properties of the catalysts have small correlation with the catalytic activity and conversion.