External surface modification of as-made ZSM-5 and their catalytic performance in the methanol to propylene reaction

Post-synthetic treatment of as-made ZSM-5 with Na2H2EDTA or H3PO4 solution can prolong the MTP reaction lifetime of ZSM-5. The H3PO4 modification can further enhance the propene selectivity due to the depressed external coke deposition rate (reduced side reactions).