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Methanol-to-Olefins in a membrane reactor with in situ steam removal - The decisive role of coking

: Best, Felix; Mundstock, Alexander; Dräger, Gerald; Rusch, Pascal; Bigall, Nadja C.; Richter, Hannes; Caro, Jürgen

Volltext ()

ChemCatChem 12 (2020), Nr.1, S.273-280
ISSN: 1867-3880
ISSN: 1867-3899
Deutsche Forschungsgemeinschaft DFG
European Commission EC
H2020; 714429; MAEROSTRUC
Multicomponent Aerogels with Tailored Nano-, Micro- Macrostructure
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IKTS ()
selectivity; reaction-mechanism; SAPO-34 catalyst; MTO conversion; deactivation; zeolite; Hydrocarbons; coke; transformation; performance

The reaction of methanol to light olefins and water (MTO) was studied in a fixed bed tubular membrane reactor using commercial SAPO-34 catalyst. In the fixed bed reactor without membrane support, the MTO reaction collapsed after 3 h time on stream. However, if the reaction by-product steam is in situ extracted from the reactor through a hydrophilic tubular LTA membrane, the reactor produces long-term stable about 60 % ethene and 10 % propene. It is shown that the reason for the superior performance of the membrane-assisted reactor is not the prevention of catalyst damage caused by steam but the influence of the water removal on the formation of different carbonaceous residues inside the SAPO-34 cages. Catalytically beneficial methylated 1 or 2 ring aromatics have been found in a higher percentage in the MTO reaction with a water removal membrane compared to the MTO reaction without membrane support.