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Benzene alkylation with ethane into ethylbenzene (EB) was studied at 370 DegC over a PtH-MFI bifunctional catalyst of high acidity (Si/Al = 15). Highly selective and stable catalyst operation was obsd. at benzene conversions up to 10-12%, which are close to the thermodn. equil. conversion value of 13.5%. Kinetic anal. of the exptl. data reveals that EB is formed via two consecutive reaction steps: (i) ethane dehydrogenation into ethene over Pt sites and (ii) benzene alkylation with ethene over acid sites. These reactions dominate at low contact times and benzene conversions up to 10-12%. At higher conversions (i.e. higher contact times) other reactions start to compete with the EB formation steps leading to a steep drop in the EB selectivity and to a decrease in the catalyst stability. The anal. of these side reactions results in a better understanding of the requirements for the selective and stable benzene alkylation with ethane into EB over bifunctional zeolite catalysts. [on SciFinder (R)]
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- 1 Finished
ENGINEERING CATALYTIC REACTION PATHWAYS; ALKYLATION OF BENZENE WITH ETHANE AND PROPANE INTO ETHYLBENZENE AND
Lukyanov, D. & Rigby, S. P.
1/05/05 → 31/03/09
Project: Research council