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采用N2 脱附、XRD ,NH3 TPD和H2 TPR等手段表征中孔分子筛AlMCM 41负载Ni催化剂 .结果表明 ,AlMCM 41负载Ni后会导致中孔分子筛骨架部分塌陷 ,孔道有序度降低 ,而且 ,Ni与载体的相互作用随着载体中铝含量的增加而增强 .此外 ,催化剂的表面酸性以弱酸和中强酸为主 .正十二烷加氢转化反应评价表明 ,在催化剂Si/Al比为 17.4～ 3 8.7范围内 ,随着铝含量的减少 ,氢解副反应加剧 ,正十二烷的转化率逐渐升高 ,异构选择率则以先增加后减小的趋势变化 ,在Si/Al =2 3 2时达到最大值 .当Si/Al比为 17.4时 ,催化剂的酸 /金属功能呈现较好的匹配 ,正十二烷裂解产物以C6为中心呈对称分布且i/n (C4～C9)比例较高
The Ni-supported mesoporous molecular sieve AlMCM 41 was characterized by means of N2 desorption, XRD, NH3 TPD and H2 TPR.The results showed that the NiMC-supported AlMCM 41 could cause partial collapse of the mesoporous molecular sieve framework and decrease the orderliness of pores, and Ni The interaction with the support was enhanced with the increase of aluminum content in the support.In addition, the surface acidity of catalyst was mainly weak acid and moderate strong acid.The evaluation of n-dodecane hydroconversion reaction showed that when Si / Al ratio of catalyst was 17.4 ~ 3 8.7, with the decrease of aluminum content, the side reactions of hydrogenolysis aggravate, the conversion of n-dodecane increased gradually, and the selectivity of isomerization changed firstly and then decreased. Under the condition of Si / Al = 2 The maximum value was reached at 3 to 3. The acid / metal function of the catalyst showed a good match when the Si / Al ratio was 17.4, and the n-dodecane pyrolysis product was symmetrically distributed around the center of C6 with i / n (C4 to C9) A higher proportion