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Study on preparation of hierarchical ZSM-5/SAPO-34 composite molecular sieve and its MTO performance
Received date: 2021-07-07
Online published: 2022-03-18
In order to prepare MTO catalysts with better performance and further investigate the effect of multi-level pores on the catalytic reaction of MTO,ZSM-5/SAPO-34 composite molecular sieve（CA-Z-S） with multi-level pore structure was successfully prepared by etching the composite molecular sieve with citric acid solution（CA） using post-treatment method. The physicochemical properties of the composite molecular sieve,such as crystalline phase,skeleton and pore structure,were also characterized.The composite molecular sieve was used for catalytic methanol-to-olefin（MTO） reaction and its catalytic performance was investigated.The characterization results showed that the treatment with CA would have effect on the morpho-logical structure of the ZSM-5/SAPO-34 composite molecular sieve,resulting in a more compact composite structure,a mod-erate amount of weak acid centers and a multi-level pore composite structure of CA-Z-S.The catalytic test results showed that the lifetime of CA-Z-S was 1 200 min at 100% methanol conversion,which was 79% higher than that of SAPO-34 and 30% higher than that of ZSM-5/SAPO-34.The selectivity of CA-Z-S for light olefins reached 90.5%,which was about 3.7% higher than that of SAPO-34.The results indicated that the post-treatment of the composite molecular sieve with CA was beneficial to the performance of the composite molecular sieve catalyzed MTO reaction.
Key words： SAPO-34; ZSM-5; composite molecular sieve; MTO reaction
Yinzhong WANG , Dongling QIN , Gang YANG . Study on preparation of hierarchical ZSM-5/SAPO-34 composite molecular sieve and its MTO performance[J]. Inorganic Chemicals Industry, 2022 , 54(3) : 119 -124 . DOI: 10.19964/j.issn.1006-4990.2021-0368
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