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采用并流沉淀法制备了Cu-Ni/SiO2二元催化剂,研究了影响催化剂活性的主要因素:Cu/Ni比,SiO2加入量,焙烧温度和焙烧时间,得到最佳制备条件:Cu/Ni=1/2.5～1/2,(Cu+Ni)/SiO2=13/7～3/1,焙烧温度350℃,焙烧时间3h。在(Cu+Ni)∶SiO2=3∶1、Cu∶Ni=1∶2.5时,不经陈化,可以制得高活性低金属残存量的Cu-Ni/SiO2二元催化剂。催化剂用量为原料脂肪酸甲酯质量的0.5%,氢压1MPa左右,反应30min,脂肪酸甲酯碘值可从100以上降到1左右。加氢产物为白色固体,肉眼观察不到金属离子的残存。原料和氢化脂肪酸甲酯的红外光谱图表明,该催化剂没有使碳碳双键生成反式异构体,具有很好的选择性和稳定性。
The Cu-Ni / SiO2 binary catalysts were prepared by cocurrent precipitation method. The main factors influencing the catalyst activity were investigated: Cu / Ni ratio, SiO2 addition amount, calcination temperature and calcination time. The optimum preparation conditions were Cu / Ni = 1 / 2.5-1 / 2, (Cu + Ni) / SiO2 = 13 / 7-3 / 1, calcination temperature 350 ℃, calcination time 3h. Cu-Ni / SiO2 binary catalyst with high activity and low residual metal content can be prepared without (Cu + Ni): SiO2 = 3: 1 and Cu: Ni = 1: 2.5. The amount of catalyst is 0.5% of the mass of the raw material fatty acid methyl ester, and the hydrogen pressure is about 1 MPa, and the reaction time is 30 minutes. The iodine value of the fatty acid methyl ester can be reduced from 100 to 1 or so. The hydrogenated product was a white solid, and the remaining metal ions were not observed by the naked eye. Infrared spectra of raw materials and hydrogenated fatty acid methyl ester show that the catalyst has good selectivity and stability without the formation of trans isomer of the carbon-carbon double bond.