Effect of the Si/Al Ratio of the Seeds in the Preparation of Supported SSZ-13 Membranes with a Secondary Growth Method
Effect of the Si/Al Ratio of the Seeds in the Preparation of Supported SSZ-13 Membranes with a Secondary Growth Method
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DOI：
10.1021/acs.iecr.3c02223
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发表时间：
2023-10
期刊：
影响因子：
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通讯作者：
Ruizhi Yi;Mei Zhang;Songyi Wang;Yi Cao;Taohong Liu;Peng Gao;Lifeng Zhang;Yanshuo Li
中科院分区：
文献类型：
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作者：
Ruizhi Yi;Mei Zhang;Songyi Wang;Yi Cao;Taohong Liu;Peng Gao;Lifeng Zhang;Yanshuo Li
探讨了SSZ-13晶种硅铝比（SAR）对二次生长法制备SSZ-13膜的影响。制备了具有四种类型SAR（3.4、5.7、11和24）的纳米级SSZ-13种子。生长过程揭示了SSZ-13膜通过具有低SAR（3.4、5.7和11）的晶种的外延生长途径形成，以及SSZ-13膜通过具有高SAR（24）的晶种的溶解-重结晶途径生长。在沸石粉制备和膜制备实验中，具有较低SAR的晶种获得SSZ-13晶体的较快生长，表明具有较低SAR的晶种对SSZ-13晶体的生长显示出较高的诱导作用。因此，用低SAR（3.4）种子合成的SSZ-13膜显示出良好的致密性和高分离性能和重现性。在60 °C下，该膜对10/90wt%的水/乙醇混合物具有1.32kg·m-2·h-1的高通量和>10000的分离因子。上述结果表明，用低SAR（3.4）的种子获得的SSZ-13膜显示出工业放大的潜在价值。
The effect of the silicon-to-aluminum ratio (SAR) of SSZ-13 seeds on the preparation of SSZ-13 membranes through a secondary growth method was explored. Nanosized SSZ-13 seeds with four types of SARs (3.4, 5.7, 11, and 24) were prepared. The growth process revealed the formation of the SSZ-13 membrane via the epitaxial growth route with seeds of low SARs (3.4, 5.7, and 11) and the growth of the SSZ-13 membrane via the dissolution–recrystallization route with seeds of high SARs (24). Both in zeolite powder preparation and membrane preparation experiments, faster growth of the SSZ-13 crystal was obtained with seeds of lower SARs, indicating that the seeds with lower SARs showed a higher inductive effect on the growth of the SSZ-13 crystal. Thus, the SSZ-13 membranes synthesized with low-SAR (3.4) seeds showed good compactness and high separation performance and reproducibility. Finally, the membrane showed a high flux of 1.32 kg·m–2·h–1and a good separation factor of >10000 for 10/90 wt % water/ethanol mixtures at 60 °C. The results above revealed that the SSZ-13 membrane obtained with seeds of a low SAR (3.4) showed a potential value toward industrial scale-up.