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Disproportionation of 1,2,4-Trimethylbenzene over Zeolite NU-87
School of Chemical Engineering and Institute of Chemical Processes, Seoul National University, Kwanak-ku, Seoul 151-742, Korea
hkrhee@snu.ac.kr
Korean Journal of Chemical Engineering, March 2000, 17(2), 198-204(7), 10.1007/BF02707143
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Abstract
The catalytic properties of zeolite NU-87 were investigated with respect to the disproportionation of 1,2,4-trimethylbenznen and the results were compared to those obtained over H-beta and H-mordentie with 12-membered ring channel system. In the conversion of 1,2,4-trimethylvenzene, the disportionation to xylene and tetramethylbenzene is preferred to the isomerization into 1,2,3- and 1,3,5-isomers over all the three zeolites, but this trend is much more pronounced over HNU-87 owing to its peculiar pore structure. Disproportionation reaction is found to proceed within the micropores of HNU-87, whereas isomerization occurs mainly on the external surface. The high selectivity to disproportionation gives more xylenes and tetramethylbenzenes over HNU-87. The detailed descriptions for the product distribution are also reported.
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