Synthesis of stacked spherical hierarchical SAPO-34 zeolite and its methanol to olefin catalytic performance

Zhou, Zihan; Wang, Xingwen; Jiang, Rongli; Chen, Xueshuai; Hou, Huilin

doi:10.1016/j.apt.2021.103414

Cited by 5 publications

(3 citation statements)

References 51 publications

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“…结果表明, 在SDA2和硅溶胶的配比为3:2时, 分子筛外表面积最大. 一旦SDA2 和硅溶胶的配比大于3:2时, 分子筛的外表面积变小, 图 5 CTAB引导合成SAPO-34分子筛的晶化原理 [65] (网络版彩图) Brito等 [76] 通过自下而上的方法利用两种介孔模板剂合成了含铜的多级孔SAPO-34分子筛, 模板剂分…”

Section: 其他多级孔硅铝酸盐沸石unclassified

软模板法制备多级孔沸石分子筛的研究进展

Qi,

Wang,

Zhang

et al. 2024

Sci. Sin.-Chim

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Zeolite is one of the widely used solid catalysts in the chemical industry, but its microporous structure also brings some limitations to the practical applications. The hierarchical zeolites have exhibited excellent catalytic performance in different catalytic reactions, especially for those containing large molecules, which is because they combine the excellent catalytic performance of micropores and the excellent mass transfer ability of mesoporous or microporous systems. Therefore, the preparation of hierarchical zeolites has become a current research hot issue. Compared to other preparation methods, the soft template method can better control the mesoporous structure and pore size of the prepared hierarchical zeolites. In this review, the effects of different soft templates on the structure and catalytic performance of hierarchical zeolites are systematically described based on zeolite type. The challenges of preparation of hierarchical zeolites via soft template method at present are put forward, and their development directions are proposed.

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Section: 其他多级孔硅铝酸盐沸石unclassified

软模板法制备多级孔沸石分子筛的研究进展

Qi,

Wang,

Zhang

et al. 2024

Sci. Sin.-Chim

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“…It is reported that hexadecyltrimethylammonium bromide (CTAB) can regulate the morphology of molecular sieve. 37 Because of the improved mass transfer efficiency, which, in turn, increased activity for the DME carbonylation, He et al 38 successfully synthesized nanosheet-like, bundle-like, and flower-like MOR. However, the c-axis growth of nanofibers and nanorods was found to be basically uninhibited, and the a-b cross-section was narrowed, so the 12-MR had the longest dimension, and the diffusion of substances was still affected.…”

Section: Introductionmentioning

confidence: 99%

“…By employing the seed technique and an organosilane surfactant to generate the mesopores in the MOR, Kim et al 36 prepared MOR that resembled nanorods. It is reported that hexadecyltrimethylammonium bromide (CTAB) can regulate the morphology of molecular sieve 37 . Because of the improved mass transfer efficiency, which, in turn, increased activity for the DME carbonylation, He et al 38 successfully synthesized nanosheet‐like, bundle‐like, and flower‐like MOR.…”

Section: Introductionmentioning

confidence: 99%

Effect of seed on synthesis of binder‐free mordenite for dimethyl ether carbonylation

Zhi,

Wang,

Liu

et al. 2023

Asia-Pacific J Chem Eng

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A series of binder‐free mordenite (MOR) zeolites were successfully prepared by hydrothermal conversion of shaped precursors containing aluminosilicate and MOR seeds. In the synthesis of seed crystals, hexadecyltrimethylammonium bromide (CTAB) was used as a crystal growth inhibitor as well as a pore filler to adjust the morphology and introduce mesoporous pores. As a result, large aggregates, assembled nanosheets, and flowers‐like MOR were successfully synthesized with these MOR seeds. The effect of seed morphology on the performance of the binder‐free MOR was studied by scanning electron microscopy (SEM), N2 adsorption–desorption, and NH3‐TPD characterization techniques. It was found that the mesopore volume of formed MOR was positively correlated with those of the seeds. The synthesized binder‐free MOR showed high activity (0.28 g methyl acetate gcat−1 h−1), 100% selectivity, and high stability in dimethyl ether (DME) carbonylation to methyl acetate, which can be attributed to the larger surface area and more mesopores. The synthesis of MOR nano‐assemblies via this cost‐effective strategy has a wide range of potential applications.

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