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Molecular transport in zeolite catalysts: depicting an integrated picture from macroscopic to microscopic scales
Chemical Society Reviews ( IF 40.4 ) Pub Date : 2022-09-07 , DOI: 10.1039/d2cs00079b Xiaoliang Liu 1 , Chuanming Wang 1 , Jian Zhou 1 , Chang Liu 1 , Zhicheng Liu 1 , Jing Shi 1 , Yangdong Wang 1 , Jiawei Teng 1 , Zaiku Xie 1, 2
Chemical Society Reviews ( IF 40.4 ) Pub Date : 2022-09-07 , DOI: 10.1039/d2cs00079b Xiaoliang Liu 1 , Chuanming Wang 1 , Jian Zhou 1 , Chang Liu 1 , Zhicheng Liu 1 , Jing Shi 1 , Yangdong Wang 1 , Jiawei Teng 1 , Zaiku Xie 1, 2
Affiliation
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Increasing social sustainability triggers the persistent progress of industrial catalysis in energy transformation and chemical production. Zeolites have been demonstrated to be pivotal catalysts in chemical industries due to their moderate acidity and versatile well-defined pore structures. However, in the context of enhancing the performances of zeolite catalysts, the perspectives on the diffusion regulations within the pores and channels in the bulk phases or external surfaces of the zeolites are often overlooked. Establishing the structure–transport–reactivity relationships in heterogeneous catalysis can provide rational guidelines to design high-performance catalysts. Herein, this tutorial review attempts to systematically depict an integrated picture of molecular transport behaviors in zeolite catalysts from macroscopic to microscopic perspectives. The advances in the accurate diffusion measurements employing both macroscopic and microscopic techniques are briefly introduced. The diffusion characteristics in zeolite catalysts under working conditions (e.g., high temperature, multi-components, and reaction coupling) are then addressed. The macroscopic internal diffusion and the microscopic diffusion occurring in the micro-zones of zeolite crystals (e.g., surface diffusion, diffusion anisotropy, and confined diffusion) are reviewed and discussed in more detail. These diffusion behaviors highly impact the underlying reaction mechanism, catalytic performances, and catalyst optimization strategies. Finally, the multi-type pore systems of practical zeolite catalysts in industrial reactors and their transport behaviors are analyzed. The fully-crystalline monolithic zeolites in the absence of binders are highlighted as rising-star catalytic materials for industrial applications. The research challenges in this field and the potential future development directions are summarized.
中文翻译：
沸石催化剂中的分子传输：描绘从宏观到微观尺度的综合图景
社会可持续性的提高引发了工业催化在能源转化和化学生产中的持续进步。沸石已被证明是化学工业中的关键催化剂，因为它们具有适中的酸度和多种明确的孔结构。然而，在提高沸石催化剂性能的背景下，对沸石体相或外表面的孔和通道内的扩散规律的看法往往被忽视。建立多相催化中的结构-传输-反应性关系可以为设计高性能催化剂提供合理的指导。在此处，本教程回顾试图从宏观到微观的角度系统地描述沸石催化剂中分子传输行为的综合图景。简要介绍了采用宏观和微观技术进行精确扩散测量的进展。工作条件下沸石催化剂中的扩散特性（然后解决例如高温、多组分和反应耦合）。宏观内部扩散和发生在沸石晶体微观区域的微观扩散（例如、表面扩散、扩散各向异性和受限扩散）进行了更详细的回顾和讨论。这些扩散行为对潜在的反应机理、催化性能和催化剂优化策略有很大影响。最后，分析了工业反应器中实用沸石催化剂的多型孔体系及其输运行为。没有粘合剂的全结晶整体沸石被强调为工业应用的后起之秀催化材料。总结了该领域的研究挑战和潜在的未来发展方向。
更新日期：2022-09-07
中文翻译：
沸石催化剂中的分子传输：描绘从宏观到微观尺度的综合图景
社会可持续性的提高引发了工业催化在能源转化和化学生产中的持续进步。沸石已被证明是化学工业中的关键催化剂，因为它们具有适中的酸度和多种明确的孔结构。然而，在提高沸石催化剂性能的背景下，对沸石体相或外表面的孔和通道内的扩散规律的看法往往被忽视。建立多相催化中的结构-传输-反应性关系可以为设计高性能催化剂提供合理的指导。在此处，本教程回顾试图从宏观到微观的角度系统地描述沸石催化剂中分子传输行为的综合图景。简要介绍了采用宏观和微观技术进行精确扩散测量的进展。工作条件下沸石催化剂中的扩散特性（然后解决例如高温、多组分和反应耦合）。宏观内部扩散和发生在沸石晶体微观区域的微观扩散（例如、表面扩散、扩散各向异性和受限扩散）进行了更详细的回顾和讨论。这些扩散行为对潜在的反应机理、催化性能和催化剂优化策略有很大影响。最后，分析了工业反应器中实用沸石催化剂的多型孔体系及其输运行为。没有粘合剂的全结晶整体沸石被强调为工业应用的后起之秀催化材料。总结了该领域的研究挑战和潜在的未来发展方向。
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