IR Operando study of ethanol dehydration over MFI zeolite

0506558 - ÚFCH JH 2020 RIV NL eng J - Journal Article
Kadam, S.A. - Shamzhy, Mariya
IR Operando study of ethanol dehydration over MFI zeolite.
Catalysis Today. Roč. 304, APR 2018 (2018), s. 51-57. ISSN 0920-5861. E-ISSN 1873-4308
R&D Projects: GA ČR GA17-01440S
Grant - others:GA MŠk(CZ) CZ.02.1.01/0.0/0.0/15_003/0000417
Institutional support: RVO:61388955
Keywords : in-situ * heteropoly compounds * reaction-mechanism * acid sites * h-zsm-5 * spectroscopy * conversion * ethylene
OECD category: Physical chemistry
Impact factor: 4.888, year: 2018
Method of publishing: Limited access

Zeolite-catalyzed dehydration of ethanol is an attractive economically feasible route for production of ethylene and butenes. The goal of this contribution is to monitor the intermediate species on the surface of ´´working´´ catalyst to rationalize the influence of the reaction conditions and zeolite characteristics on the dehydration pathways. With this respect the rates of diethyl ether (DEE) and ethylene formation in ethanol dehydration along with the quantification of the surface-intermediates (ethanol monomer and dimer) were simultaneously assessed under different reaction conditions in H-MFI zeolite. The reaction conditions (pressure, temperature, and ethanol conversion) control the population of surface intermediates and hence determine the dominant reaction mechanism. The results support the prevalence of dimer-assisted etherification at high ethanol pressures and enhanced contribution of ethoxide-mediated route with increasing the temperature. At high conversion, the DEE decomposition route producing ethylene was confirmed for H-MFI at 488 K along with ethoxide-mediated pathway.
Permanent Link: http://hdl.handle.net/11104/0297792