PETR 23 |
| We have considered the importance of electronic facor in selective conversion of polyaromatic hydrocarbons and proposed a concept called restricted electronic transition-state selectivity in an earlier study [Song et al., Appl Catal A: Gen 182 (1999) 175]. The present work deals with the shape-selective synthesis of 2,6-dimethylnaphthalene by methylation of 2-methylnaphthalene and naphthalene over various modified molecular sieve catalysts using ZSM-5 samples as starting materials. Superior selectivity and stability were observed on some chemically modified zeolite catalysts that show lower acidity and weaker acidic strength. Good examples of such modified catalysts are Fe-Al-ZSM-5 that has been prepared by post-synthesis isomorphoys substitution of Al in ZSM-5 with Fe [Song et al, Stud Surf Sci Catal 170 (2007), 1275]. Such catalysts have been characterization by several analytical techniques including ICP, TPD, FT-IR, and solid-state NMR. Here we attempt to rationalize the results using the restricted electronic transition-state selectivity concept based on the data from both the experimental work and the computational analysis of shape-selective methylation. |
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Zeolite Catalysis for Green Chemistry in Synthesis of Chemicals and Fuels
1:20 PM-5:30 PM, Sunday, April 6, 2008 Morial Convention Center -- Rm. 209, Oral
Division of Petroleum Chemistry |