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Break-in and deactivation of ZSM-5 during ethylation of toluene

Authors
Journal
Zeolites
0144-2449
Publisher
Elsevier
Publication Date
Volume
12
Issue
8
Identifiers
DOI: 10.1016/0144-2449(92)90155-i
Keywords
  • Alkylation
  • Tolune
  • Para-Selectivity
  • Zsm-5
  • Coke Formation
  • Break-In
  • Deactivition

Abstract

Abstract Catalysts with 0, 4, 8, and 12% MgO content were prepared by impregnation of NH 4ZSM-5 with Mg (NO 3) 2 + MG (CH 3CO 2) 2 followed by heating at 973 K. Alkylation of toluene with ethylene in nitrogen or hydrogen carrier gas was carried out on these catalysts at 673 K in a laboratory-scale fixed-bed downflow reactor made of quartz. The amount of coke deposited as well as the acidity and pore volume of the coke-containing catalyst were determined. In the early stage of the reaction, defined as the break-in period, the yield of ethyltoluenes increased and the yield of side products decreased with time on stream. Phenomena in the break-in period were explained by partial deactivation due to coke deposition.

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