Control of aluminum distribution in ZSM-5 zeolite for enhancement of its catalytic performance for propane aromatization

IF 4.3 3区工程技术 Q2 ENGINEERING, CHEMICAL

Frontiers of Chemical Science and Engineering Pub Date : 2024-06-11 DOI:10.1007/s11705-024-2439-8

Zhao Ma, Dezhi Shi, Sen Wang, Mei Dong, Weibin Fan

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Abstract

Regulation of aluminum distribution in zeolite framework is an effective method for improving its catalytic performance for propane aromatization. Herein, we found that recrystallization and post-realuminization of ZSM-5 cannot only create hollow structures to enhance the diffusion ability, but also adjust the content and position of paired aluminum species in its framework. Various characterizations results confirmed that increase of paired aluminum content and inducement of more aluminum atoms sited in the intersection cavity are beneficial to the formation of aromatic products in propane aromatization. As a result, the hollow-structured ZSM-5 zeolite with more paired aluminum (H-200-hollow) showed higher propane conversion and aromatics selectivity than other samples at the same conditions. The catalytic performance of H-200-hollow can be further improved by ion-exchanging with a small amount of Ga(III) species. The propane conversion and aromatics selectivity of Ga-200-hollow reached as high as 95% and 70%, respectively, at 540 °C and 1 atm.

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控制 ZSM-5 沸石中的铝分布以提高其丙烷芳香化催化性能

调节铝在沸石骨架中的分布是提高其丙烷芳构化催化性能的有效方法。在本文中，我们发现 ZSM-5 的再结晶和后再铝化不仅能形成中空结构以增强扩散能力，还能调节框架中成对铝的含量和位置。各种表征结果证实，增加成对铝的含量和诱导更多的铝原子位于相交空腔中有利于丙烷芳香化过程中芳香产物的形成。因此，在相同条件下，铝配对含量更高的空心结构 ZSM-5 沸石（H-200-空心）比其他样品具有更高的丙烷转化率和芳烃选择性。通过与少量 Ga（III）物种进行离子交换，可以进一步提高 H-200-hollow 的催化性能。在 540 °C 和 1 atm 条件下，Ga-200-空心的丙烷转化率和芳烃选择性分别高达 95% 和 70%。

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来源期刊

Frontiers of Chemical Science and Engineering ENGINEERING, CHEMICAL-

CiteScore

7.60

自引率

6.70%

发文量

868

审稿时长

1 months

期刊介绍： Frontiers of Chemical Science and Engineering presents the latest developments in chemical science and engineering, emphasizing emerging and multidisciplinary fields and international trends in research and development. The journal promotes communication and exchange between scientists all over the world. The contents include original reviews, research papers and short communications. Coverage includes catalysis and reaction engineering, clean energy, functional material, nanotechnology and nanoscience, biomaterials and biotechnology, particle technology and multiphase processing, separation science and technology, sustainable technologies and green processing.