The effect of pre coking on the MTP reaction performance of ZSM-5 catalyst
Various pre coking catalysts were prepared using methanol,1-hexene,methanol,and water as pre coking raw materials with different reaction parameters(temperature and time).The physicochemical properties of the pre coking catalysts were characterized using a temperature programmed chemical ad-sorption analyzer,elemental analyzer,and thermogravimetric analyzer.The activity of the catalysts in the MTP reaction was evaluated using a catalyst performance evaluation device.The results showed that pre coking modification had less damage to the acidic sites of ZSM-5 catalyst and could maintain its high ac-tivity.The catalyst pre coking modified with 5%methanol solution showed good anti coking ability in MTP reaction after high-temperature steam treatment(480℃),and the selectivity of propylene reached 42%.
methanol to propylenecatalystspre cokingZSM-5 molecular sieve
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