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.
Highlights
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
Beneficial methylated 1 or 2 ring aromatics have been found in a higher percentage in the methanol to light olefins and water (MTO) reaction with a water removal membrane compared to the MTO reaction without membrane support
We demonstrated the positive influence of removing water through an Linde Type A (LTA) zeolite membrane from a SAPO-34 catalyst bed during MTO reaction in a tube membrane reactor
Summary
Felix Rieck genannt Best,*[a] Alexander Mundstock,[a] Gerald Dräger,[b] Pascal Rusch,[a]. The reaction of methanol to light olefins and water (MTO) was studied in a fixed bed tubular membrane reactor using commercial SAPO-34 catalyst. MTO as an autocatalytic reaction is fueled by the formation of those beneficial aromatics in the HCP, which leads to an increased methanol conversion.[18]. These aromatics which are necessary for the MTO, transform with increasing TOS into more complex carbon residues called coke, resulting in a varying product selectivity over time and leads to a breakdown of the MTO due to pore blocking.[14,19].
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