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Received June 30, 2015
Accepted March 4, 2016
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The catalytic performance of methylation of naphthalene with methanol over SAPO-11 zeolites synthesized with different Si content
School of Chemical and Biological Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, P. R. China 1College of Chemistry and Chemical Engineering, Jin Zhong University, Yuci 030619, P. R. China 2College of Environment and Safety, Taiyuan University of Science and Technology, Taiyuan 030024, P. R. China 3Chinese Academy of Sciences, Institute of Coal Chemistry, Taiyuan 030001, P. R. China
guosq@sxicc.ac.cn
Korean Journal of Chemical Engineering, July 2016, 33(7), 2034-2041(8), 10.1007/s11814-016-0065-y
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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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