Inorganic Chemicals Industry >
Study on preparation of multistage pore nano-SAPO-34 molecular sieves and its methanol to olefin performance
Received date: 2023-03-31
Online published: 2024-01-18
In order to shorten the crystallization time of SAPO-34 molecular sieve at high temperature and improve its life and selectivity in MTO reaction，triethylamine and tetraethyl ammonium hydroxide were used as double templates to rapidly prepare nano-sized SAPO-34 molecular sieve with a particle size of 300~500 nm by step crystallization method.At the same time，the surfactant cetyltrimethyl ammonium bromide（CTAB） was added to further modify the molecular sieve，and the multiporous SAPO-34 molecular sieve（C-ST1T2） was obtained.The physicochemical properties of all the samples were characterized and applied to the catalytic reaction of methanol to olefin.The catalytic performance under certain conditions was investigated.The characterization results showed that the crystallization time of nano-sized SAPO-34 molecular sieve could be shortened by step crystallization.After modification by CTAB，SAPO-34 molecular sieve with multistage pore structure and moderate acid strength was obtained.The catalytic performance test showed that the methanol conversion rate of C-ST1T2 could reach 100%，and the catalytic life could reach 690 min，which was significantly improved compared with the molecular sieve synthesized by single template agent.Meanwhile，the selectivity of low carbon olefin was stable at more than 89%.The results showed that the multistage pore modification of molecular sieve using CTAB was beneficial to further improve the MTO reaction performance of molecular sieve.
Key words： SAPO-34; nano molecular sieves; step-by-step crystallization; MTO reaction
CHEN Xu , YANG Gang , LI Haitao . Study on preparation of multistage pore nano-SAPO-34 molecular sieves and its methanol to olefin performance[J]. Inorganic Chemicals Industry, 2024 , 56(1) : 134 -140 . DOI: 10.19964/j.issn.1006-4990.2023-0183
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