Methanol-to-Olefins in a Membrane Reactor with in situ Steam Removal – The Decisive Role of Coking

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Abstract

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.

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Rieck genannt Best, F., Mundstock, A., Dräger, G., Rusch, P., Bigall, N. C., Richter, H., & Caro, J. (2020). Methanol-to-Olefins in a Membrane Reactor with in situ Steam Removal – The Decisive Role of Coking. ChemCatChem, 12(1), 273–280. https://doi.org/10.1002/cctc.201901222

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