Ni/γ-Al_(2)O_(3)的制备及其催化邻苯二甲酸二异壬酯加氢的研究

Preparation of Ni/γ-Al_(2)O_(3) and application in catalytic hydrogenation of diisononyl phthalate

采用等体积浸渍法制备不同镍质量分数的Ni/γ-Al_(2)O_(3)催化剂,利用XRD、SEM、BET、H2-TPR和NH3-TPD等对其进行一系列表征,评价其催化邻苯二甲酸二异壬酯的加氢性能,30%Ni/γ-Al_(2)O_(3)表现出优异的催化活性。同时,考察了Ni/γ-Al_(2)O_(3)催化剂的焙烧温度和还原温度对邻苯二甲酸二异壬酯加氢的性能影响,结果表明,在催化剂焙烧温度为500℃、还原温度为450℃的最佳条件下,环己烷-1,2-二甲酸二异壬酯的收率为85.74%。对邻苯二甲酸二异壬酯的加氢工艺进行优化,在温度为160℃、压力为7 MPa、空速为0.25 h^(-1)和氢油比为1500∶1的条件下,邻苯二甲酸二异壬酯加氢效果最佳,反应的收率高达93.53%。

Ni/γ-Al_(2)O_(3) catalysts with different Ni contents are prepared through equal volume impregnation method,and characterized by XRD,SEM,BET,H2-TPR and NH3-TPD.Their catalytic performance for hydrogenation of diisononyl phthalate is evaluated.It is found that 30%Ni/γ-Al_(2)O_(3) shows an excellent catalytic activity.The effects of calcination temperature and reduction temperature of Ni/γ-Al_(2)O_(3) catalyst on its performance in hydrogenation of diisononyl phthalate are investigated.It is shown that the optimal calcination temperature and reduction temperature are 500℃and 450℃,respectively.Over the catalyst that is prepared under the optimal conditions,the yield of diisononyl cyclohexane 1,2-dicarboxylate can reach 85.74%.The hydrogenation process for diisononyl phthalate is optimized.The hydrogenation effect of diisononyl phthalate reaches the best with a yield as high as 93.53%when the temperature remains at 160℃,pressure is 7 MPa,space velocity is 0.25 h^(-1) and the ratio of hydrogen to oil is 1,500∶1.