Journal
PETROLEUM CHEMISTRY
Volume 59, Issue 7, Pages 726-732Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0965544119070144
Keywords
zeolites; ZSM-23; ZSM-5; acid sites; isomerization; ethylene oxide; acetaldehyde
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It has been shown by the example of zeolites with the MTT (Al-ZSM-23 and Fe-ZSM-23) and MFI (Al-ZSM-5 and Fe-ZSM-5) structures that mesoporous zeolites are efficient catalysts for the gas-phase isomerization of ethylene oxide to acetaldehyde. At 300-400 degrees C and complete conversion of ethylene oxide, the selectivity of its conversion to acetaldehyde (S-AA) reaches at least 90%. The key factors determining the selectivity and stability of the catalyst are the topology of the zeolite and its acid properties. Unidimensional zeolites with the MTT structure demonstrate higher S-AA in comparison with the samples with the three-dimensional MFI structure. Decreasing the strength of Bronsted acid sites by replacing Al by Fe in the zeolites of both structural types also leads to a growth in S-AA. The samples are arranged in following order of decreasing S-AA: Fe-ZSM-23 > Fe-ZSM-5 = ZSM-23 > ZSM-5. The main byproduct of the reaction is crotonic aldehyde, the formation of which is promoted by strong Bronsted acid sites. The crotonic aldehyde selectivity over aluminosilicate samples is above 6%.
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