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以NiCl_2、Cu(NO_3)_2、Ce(NO_3)_3为原料,采用等体积浸渍法和KBH4还原法制备Ni-Cu-Ce-B/γ-Al_2O_3催化剂,研究了其催化苯酚选择性加氢制备环己酮的反应性能。考察了反应温度、反应压力、反应时间、液时空速、氢气/苯酚体积比、催化剂用量、不同助剂对反应活性和选择性的影响,通过正交实验筛选出了最佳的反应条件。结果表明,在反应温度为150℃、反应压力为1.0 MPa、反应时间为1.5 h、液时空速为2.0 h~(-1)、氢气/苯酚体积比为50/1时,反应活性达48.21%,反应选择性达29.16%。助剂Cu、Ce的加入和催化剂显碱性都有利于生成环己酮。
Ni-Cu-Ce-B / γ-Al_2O_3 catalysts were prepared by the same volume impregnation method and KBH4 reduction method using NiCl_2, Cu (NO_3) _2 and Ce (NO_3) _3 as raw materials, Cyclohexanone reactivity. The effects of reaction temperature, reaction pressure, reaction time, liquid hourly space velocity, hydrogen / phenol volume ratio, the amount of catalyst and different additives on the reactivity and selectivity were investigated. The optimum reaction conditions were screened by orthogonal experiment. The results showed that the reactivity reached 48.21% when the reaction temperature was 150 ℃, the reaction pressure was 1.0 MPa, the reaction time was 1.5 h, the liquid hourly space velocity was 2.0 h -1, and the volume ratio of hydrogen to phenol was 50/1. , The reaction selectivity of 29.16%. Additives Cu, Ce addition and alkaline catalyst are conducive to the generation of cyclohexanone.