The catalytic performance of methylation of naphthalene with methanol over SAPO-11 zeolites synthesized with different Si content |
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| Authors: | Xiaoxiao Wang Fang Guo Xianxian Wei Zhenmin Liu Wei Zhang Shaoqing Guo Liangfu Zhao |
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| Affiliation: | 1.School of Chemical and Biological Engineering,Taiyuan University of Science and Technology,Taiyuan,P. R. China;2.Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan,P. R. China;3.College of Environment and Safety,Taiyuan University of Science and Technology,Taiyuan,P. R. China;4.College of Chemistry and Chemical Engineering,Jin Zhong University,Yuci,P. R. China |
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| Abstract: | A series of SAPO-11 zeolites with different Si contents were prepared by hydrothermally synthesized method. They were characterized by ICP, XRD, SEM, FT-IR, N2 adsorption-desorption, NH3-TPD and 29Si MAS NMR, and evaluated by the methylation of naphthalene with methanol to 2,6-dimethylnaphthalene (2,6-DMN). According to XRD and SEM results, the crystallinity of SAPO-11 sample increased with increase of the Si content until the SiO2/Al2O3 ratio was up to 0.2. However, a reduction in the crystallinity was observed with further increase of the Si content of the synthesis. N2 adsorption-desorption results showed that all the samples possessed micropores and secondary mesopores. SAPO-11 sample with SiO2/Al2O3 ratio of 0.2 exhibited the largest secondary mesopores size distributions. NH3-TPD and 29Si MAS NMR showed that the Si content was incorporated into the framework affecting not only the acid sites but also the acid strength of SAPO-11. SAPO-11 with SiO2/Al2O3 ratio of 0.2 presented the high catalytic performances for the methylation of naphthalene, which was mainly attributed to the amount of secondary mesopores in the SAPO-11 zeolite. |
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