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Enhancement of the Shape-Selectivity in Alkylation of Methylnaphthalene Over the Zsm-5 Modified By Chemical Vapor Deposition of Si(Och3)4

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Shape-selectivity of alkylation of 2-methylnaphthalene over the ZSM-5 zeolite has been improved by a method of chemical vapor deposition of silicon methoxide. The deposition of silica on ZSM-5 increased the βselectivity, which was defined as the sum of distributions of 2,3-, 2,6-, and 2,7-dimethyinaphthalenes; however, it did not increase selectively the product distribution of 2,6-dimethylnaphthalene. From the characterization of two kinds of the silica-deposited ZSM-5, it was found that the (β-selectivity was enhanced by the inactivation of the external surface as well as by the control of pore-opening size.

Affiliations: 1: Department of Materials Science, Faculty of Engineering, Tottori University, Koyama-cho, Tottori 680, Japan; 2: Department of Applied Chemistry, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-01, Japan


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