Facile synthesis of rodlike ZSM-5 zeolite microspheres and catalytic performance in methanol to propylene reaction

IF 2.5 4区材料科学 Q2 CHEMISTRY, APPLIED Journal of Porous Materials Pub Date : 2024-03-23 DOI:10.1007/s10934-024-01590-z

Hengbao Chen, Tianyang Li, Zehan Li, Bing Li, Manli Zhang

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Abstract

Rodlike ZSM-5 zeolite microspheres (R-Z5) were synthesized via a seed induced hydrothermal method with S-1 seeds in the presence of β-cyclodextrin (CD). The synthesized ZSM-5 zeolites were characterized with XRD, SEM, N₂ adsorption and desorption, NH₃-TPD, the catalytic performance of R-Z5 catalysts was studied for the methanol to propylene (MTP) reaction. The effects of the ratio of CD/SiO₂ on the morphologies and textural properties of the products were discussed in detail. A possible formation process of R-Z5 was proposed. The results showed that CD played a key role in the preparation of R-Z5, which could be ascribed to the amphipathy of CD for the formation of rodlike ZSM-5 crystals. Compared with the conventional seed induced method, R-Z5 zeolites possessed the larger BET surface area and mesopore volumes and the more moderate acidic sites. Moreover, the synthesized R-Z5 catalysts exhibited excellent conversion activity (64 h) and propylene selectivity (41.35%) in the primary catalytic performance of MTP reaction.

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杆状 ZSM-5 沸石微球的简易合成及其在甲醇制丙烯反应中的催化性能

在 β-环糊精（CD）存在的条件下，通过种子诱导水热法用 S-1 种子合成了棒状 ZSM-5 沸石微球（R-Z5）。利用 XRD、SEM、N2 吸附和解吸、NH3-TPD 对合成的 ZSM-5 沸石进行了表征，并研究了 R-Z5 催化剂在甲醇制丙烯 (MTP) 反应中的催化性能。详细讨论了 CD/SiO2 的比例对产物形态和质构特性的影响。提出了 R-Z5 的可能形成过程。结果表明，CD 在 R-Z5 的制备过程中发挥了关键作用，这可能归因于 CD 对形成棒状 ZSM-5 晶体的两性作用。与传统的种子诱导法相比，R-Z5 沸石具有更大的 BET 表面积和中孔体积以及更适中的酸性位点。此外，合成的 R-Z5 催化剂在 MTP 反应的一级催化性能中表现出优异的转化活性（64 h）和丙烯选择性（41.35%）。

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来源期刊

Journal of Porous Materials 工程技术-材料科学：综合

CiteScore

4.80

自引率

7.70%

发文量

203

审稿时长

2.6 months

期刊介绍： The Journal of Porous Materials is an interdisciplinary and international periodical devoted to all types of porous materials. Its aim is the rapid publication of high quality, peer-reviewed papers focused on the synthesis, processing, characterization and property evaluation of all porous materials. The objective is to establish a unique journal that will serve as a principal means of communication for the growing interdisciplinary field of porous materials. Porous materials include microporous materials with 50 nm pores. Examples of microporous materials are natural and synthetic molecular sieves, cationic and anionic clays, pillared clays, tobermorites, pillared Zr and Ti phosphates, spherosilicates, carbons, porous polymers, xerogels, etc. Mesoporous materials include synthetic molecular sieves, xerogels, aerogels, glasses, glass ceramics, porous polymers, etc.; while macroporous materials include ceramics, glass ceramics, porous polymers, aerogels, cement, etc. The porous materials can be crystalline, semicrystalline or noncrystalline, or combinations thereof. They can also be either organic, inorganic, or their composites. The overall objective of the journal is the establishment of one main forum covering the basic and applied aspects of all porous materials.