Structure And Benzene Hydrogenation Performance Over Supported Amorphous Alloy Catalyst

The amorphous alloy is a kind of new material with short-range ordering while long-range disordering structure,and its unique structural character results in the excellent catalytic properties,such as the high catalytic activity and selectivity,the high resistance to the sulfur poison,especially the less environmental pollution occurred during the catalyst preparation,which is accord with the development concept of current chemical engineering. In addition,the amorphous is characterized by well-proportioned component,various composition and large specific surface area.Therefore,it has theoretical significance and applied value for scientists to develop it to be a novel catalytic materials.Supported Ni-B/AM amorphous alloy catalyst, the molar ratio of aluminium to boron of catalyst is 1:3.4 and the nickel content of is 7%, are prepared by chemical reduction method and characterized by XRD,TPR,BET,TG-DTA,ICP,XPS,SEM. The efftet of preparing conditions,including the activation temperature,molar ratio of aluminium to boron , nickel mass fraction, on the hydrogenation performance of catalysts are examined by hydrogenation of benzene in a high pressure microreactor. The results show that NiB are supported on the AM as amorphous; Ni-B/AM results show that the best preparation conditions for the activation temperature 220℃,activation time of 30min,nickel content of 7%,Ni-B ratio 1:3.4,catalyst activity the highest,best hydrogenation;Under reaction conditions of pressure 0.5 MPa, ratio of hydrogen to benzene 4, space velocity 1.0h-1, when the reaction temperature is higher than 160℃, the yield of hydrogenation benzene to cyclohexane is 100%.Supported Ni-Pt-B/AM amorphous alloy catalyst, is prepared by chemical reduction method and characterized. The efftet of preparing conditions,including sodu concentration,the platinum on the hydrogenation performance of catalysts are examined by hydrogenation of benzene in a high pressure microreactor. Ni-Pt-B/AM amorphous alloy catalyst results show that the aqueous solution in the KBH4 to restore the highest activity when the catalytic hydrogenation; when the Ni-Pt ratio of 50:1,when 85℃cyclohexane production rate has reached 100%;Ni-B/AM adding trace platinum catalyst can improve the catalyst sulfur tolerance and thermal stability,effectively improve the catalytic hydrogenation conditions; benzene hydrogenation reaction of cyclohexane the optimum conditions for the reaction pressure 0.5MPa,benzene,hydrogen more than 4,space velocity of 1.3h-1 under the conditions,when the temperature is higher than 130℃,the cyclohexane yield was 100%.