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以CTAB为改性剂,制备了多级孔SAPO-5-x(x为CTAB与SiO_2的摩尔比,x=0.04~0.10)分子筛和多级孔Ni/SAPO-5-x萘加氢制十氢萘催化剂.加入CTAB后形成了微-介孔多级孔孔道结构,孔容和平均孔径均有增加,但是分子筛的晶相结构没有破坏,层状的外貌没有变化.随x值的增大,SAPO-5-x(x=0~0.10)的孔容和平均孔径先增加后减小,SAPO-5-0.07的最大,Ni/SAPO-5-0.07的平均孔径进一步增大;Ni/SAPO-5-x(x=0~0.10)的强酸位强度先下降后增加,x=0.07时强酸位强度最弱,且以L酸中心为主;催化剂的十氢萘选择性先增大后减小,x=0.07时最大.引入CTAB后催化剂活性略有增加,萘转化率接近100%,十氢萘的选择性可以达到95%以上.
The multi-level pore SAPO-5-x (x is the mole ratio of CTAB to SiO 2, x = 0.04-0.10) and the multistage pore Ni / SAPO-5-x naphthalene hydrogenation system was prepared by using CTAB as modifier Hydrogenated naphthalene catalyst.The formation of micro-mesoporous multichannel pore structure after adding CTAB increased the pore volume and average pore diameter, but the crystal phase structure of the molecular sieve did not destroy, the appearance of the layer did not change.With the increase of x value , The pore volume and average pore size of SAPO-5-x (x = 0-0.10) firstly increased and then decreased, the maximum of SAPO-5-0.07 and the average pore size of Ni / SAPO-5-0.07 further increased; The intensity of strong acid sites in -5-x (x = 0 ~ 0.10) decreased first and then increased. The intensity of strong acid sites was the weakest at x = 0.07, and the L acid sites were the main ones. Small, x = 0.07 maximum.CTAB catalyst activity slightly increased, naphthalene conversion close to 100%, decalin selectivity can reach more than 95%.