Study On The Catalystic Peformance Of Cu-Zn-Ca/SiO₂ Catalysts For The Vapor Phase Hydrogenation Of Furfural To Furfuryl Alcohol

Furfuryl alcohol（FOL）,as a very important chemical raw material,can not only be directly used as adhesives,lubricants and dispersants in industry,but also can be used to synthesize multi-purpose furfuryl alcohol resin,phenolic resin,urea formaldehyde resin,etc.It is widely used in medicine,mechanical casting and material industries.At present,FOL was usually produced by catalytic hydrogenation of furfural（FFR）.In the past,Cu-Cr catalyst was mainly used for the selective hydrogenation of furfural to furfuryl alcohol.However,the reaction temperature was high and the equipment was required to be high.Moreover,chromium trioxide caused serious environmental pollution.In recent years,Cu-based catalysts are mainly used in the production of furfuryl alcohol in industry.However,Cu-based catalysts are mainly imported from abroad which are expensive.Therefore,the development of green,cheap and efficient copper based catalyst and optimization of process conditions are of great significance for the industrial application of furfural hydrogenation to produce furfuryl alcohol.In this work,Cu-Zn-Ca/SiO₂catalysts were prepared by coprecipitation method（CP method）and ammonia evaporation method（AE method）,respectively.The effects of copper loading and calcination temperature on the texture and hydrogenation performance of the catalyst were studied by single variable method,and the process conditions were optimized,the optimal reaction temperature,H₂/FFR and volume space velocity were explored.On this basis,the life of the catalyst and the effect of promoters on the performance of the catalyst were tested.The texture of Cu-Zn-Ca/SiO₂catalyst was characterized by N₂physical adsorption desorption,NH₃temperature programmed desorption,X-ray diffraction and H₂temperature programmed reduction.The 45Cu-2Zn-2Ca/SiO₂catalyst was prepared by coprecipitation method has the best catalytic performance.The 45Cu-2Zn-2Ca/SiO₂catalyst was calcined at 400^oC,the reaction temperature is 150^oC,H₂/FFR is 9.5,and gaseous hourly space velocity（GHSV）is 0.3 h^-1.The conversion of furfural was 99.81%,the selectivity of furfuryl alcohol was96.06%,and the yield of furfuryl alcohol was 95.87%.When 35Cu-2Zn-2Ca/SiO₂catalyst was prepared by ammonia evaporation method,when H₂/FFR was 9.5,gaseous hourly space velocity（GHSV）was 0.3h^-1,reaction temperature was 130^oC under normal pressure,35Cu-2Zn-2Ca/SiO₂catalyst had the best catalytic performance for furfural hydrogenation,the conversion of furfural was 99.16%,the selectivity of furfuryl alcohol was 98.80%and furfuryl alcohol yield was 97.97%.From the point of view of catalyst stability,the performance of catalysts prepared by coprecipitation method（CP method）was better than ammonia evaporation method（AE method）.