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分别以水玻璃、硫酸铝为硅源和铝源,加入NaZSM-5合成ZSM-5／MOR混晶分子筛。用XRD,SEM,BET,NH3-TPD等方法对混晶分子筛进行表征;在450℃下考察其对裂化和甲苯烷基化的催化性能,并与ZSM-5和丝光沸石的机械混合物进行对比。结果表明,混晶分子筛中存在的丝光沸石、ZSM-5不是呈纯粹的物理混合状态,混晶分子筛的酸性和酸量与机械混合物有所不同,水蒸气老化混晶分子筛对正十四烷的裂化活性较机械混合物强;而老化前机械混合物的甲苯烷基化活性较混晶分子筛强,但两者对3种二甲苯的选择性无差异。
Separately, sodium silicate and aluminum sulfate were used as the silicon source and the aluminum source respectively, and the ZSM-5 / MOR mixed crystal molecular sieve was synthesized by adding NaZSM-5. The mixed crystal molecular sieve was characterized by XRD, SEM, BET and NH3-TPD. The catalytic performance of cracking and toluene alkylation was investigated at 450 ℃, and compared with the mechanical mixture of ZSM-5 and mordenite. The results show that the presence of mordenite in the mixed crystal zeolite, ZSM-5 is not a purely physical mixing state, mixed acid molecular sieve acidity and acid content is different from the mechanical mixture of water vapor aging mixed crystal molecular sieve n-tetradecane The cracking activity was stronger than that of the mechanical mixture. However, the toluene alkylation activity of the mechanical mixture before aging was stronger than that of the mixed molecular sieve, but there was no difference in the selectivity of the two kinds of xylene.