新型固定床Raney Ni催化剂的制备、表征及苯加氢活性评价

将镍铝合金粉、拟薄水铝石和田菁粉捏合、成型，在空气中高温焙烧，然后用苛性碱溶液充分浸取，制备出可应用于固定床加氢的活性Raney Ni催化剂.实验结果表明，成型合金焙烧过程中，富铝合金相逐渐转化为贫铝相，同时小部分金属铝氧化生成α-Al₂O₃，可提高催化剂的颗粒强度.BET和SEM分析表明，催化剂表面具有较宽的缝隙和丰富的大孔结构.苯加氢活性评价表明，在一定反应条件下，该新型固定床Raney Ni催化剂活性高于传统负载型镍催化剂，也高于按照专利方法制备的同类型催化剂.

Preparation and characterization of novel fixed-bed Raney nickel catalyst and activity evaluation for benzene hydrogenation

An activated novel fixed-bed Raney nickel catalyst for hydrogenation of benzene to cyclohexane was prepared by extruding the Ni-Al alloy powder, sesbania cannavina (S.C.) powder with binding materials made of pseudoboehmite, calcining the extrudates in air at a high temperature, and leaching out the aluminum with caustic solution. The experimental results showed that the alloy phase rich in aluminum was gradually transformed into the phase poor in aluminum during the calcination of the alloy extrudates and a small part of aluminum in Ni-Al alloy was oxidized to α-alumina to increase the catalyst compressive strength.The analysis results of SEM and BET showed that wider aperture and abundant macroporosity existed on the catalyst surface.The results of benzene hydrogenation suggested that the novel catalyst showed a higher hydrogenation activity than γ-alumina supported nickel catalyst and the same type of fixed-bed Raney nickel catalyst prepared according to the patent methods.