ZSM-5和ZSM-11分子筛催化苯与甲醇烷基化反应研究
发布时间：2019-06-08 12:06
【摘要】：采用水蒸气辅助晶化法合成ZSM-5、ZSM-11和多级孔ZSM-11分子筛,运用XRD、SEM、NH3-TPD、N2吸附-脱附和TG方法对合成的分子筛进行表征。结果表明:所合成的ZSM-5和ZSM-11分子筛的比表面积、微孔体积、晶粒大小和酸性等物化性质相似;多级孔ZSM-11分子筛引入了大量介孔,微孔体积得以保留。合成的分子筛催化苯与甲醇烷基化反应结果表明,ZSM-11相对于ZSM-5表现出更高的反应活性和稳定性,这是因为C7、C8等芳烃分子在ZSM-11孔道内扩散更快;多级孔ZSM-11相对于微孔ZSM-11反应活性进一步提升,在反应温度460℃、压力0.2 MPa、质量空速3 h-1的条件下,苯转化率达到54.3%,甲苯和二甲苯总选择性达到91.9%,其中二甲苯选择性为37.9%,该催化剂在反应240 h内保持良好的稳定性,相对于微孔ZSM-11,寿命显著提升。
[Abstract]:ZSM-5,ZSM-11 and multiporous ZSM-11 molecular sieves were synthesized by steam assisted crystallization. The synthesized molecular sieves were characterized by XRD,SEM,NH3-TPD,N2 adsorption-desorption and TG. The results show that the specific surface area, micropore volume, grain size and acidity of the synthesized ZSM-5 and ZSM-11 molecular sieves are similar, and a large number of mesoporous ZSM-11 molecular sieves are introduced, and the micropore volume can be retained. The alkylation of benzene with methanol catalyzed by the synthesized molecular sieves showed that ZSM-11 showed higher activity and stability than ZSM-5, which was due to the faster diffusion of aromatic molecules such as C8 and C8 in the ZSM-11 channel. The reaction activity of multistage pore ZSM-11 was further improved compared with that of microporous ZSM-11-11. under the conditions of reaction temperature 460 鈩，
本文编号：2495271
[Abstract]:ZSM-5,ZSM-11 and multiporous ZSM-11 molecular sieves were synthesized by steam assisted crystallization. The synthesized molecular sieves were characterized by XRD,SEM,NH3-TPD,N2 adsorption-desorption and TG. The results show that the specific surface area, micropore volume, grain size and acidity of the synthesized ZSM-5 and ZSM-11 molecular sieves are similar, and a large number of mesoporous ZSM-11 molecular sieves are introduced, and the micropore volume can be retained. The alkylation of benzene with methanol catalyzed by the synthesized molecular sieves showed that ZSM-11 showed higher activity and stability than ZSM-5, which was due to the faster diffusion of aromatic molecules such as C8 and C8 in the ZSM-11 channel. The reaction activity of multistage pore ZSM-11 was further improved compared with that of microporous ZSM-11-11. under the conditions of reaction temperature 460 鈩，
本文编号：2495271
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