Diffusion and catalyst efficiency in hierarchical zeolite catalysts.
Diffusion and catalyst efficiency in hierarchical zeolite catalysts.
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DOI：
10.1093/nsr/nwaa184
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发表时间：
2020-11
影响因子：
20.6
通讯作者：
Mintova S
中科院分区：
文献类型：
--
作者：
Peng P;Gao XH;Yan ZF;Mintova S
在过去的几十年里，具有降低扩散限制和提高催化剂效率的分级沸石的制备已经成为沸石和多孔材料化学领域的重要焦点。本文将重点介绍分级分子筛和工业催化剂的扩散和催化效率。从化学反应工程的角度来看，扩散和催化剂效率在两个层次（沸石组分水平和工业催化剂水平）的好处将进行分析。在沸石组分水平，提出了基于用于提高催化剂有效性因子的策略的三种类型的中孔：（i）“功能中孔”（提高有效扩散率）;（ii）“辅助中孔”（降低扩散长度）;和（iii）“整合中孔”（其组合）。在工业催化剂水平上，揭示了组成成分之间的位置和互连性。多组分沸石基工业催化剂中的分级孔互连性通过流化催化裂化和双功能加氢异构化催化剂举例说明。利用先进的原位和/或操作光谱、显微镜和衍射技术，可以充分理解工业沸石催化剂在分级沸石组分和催化剂体水平上的合理设计。
The preparation of hierarchical zeolites with reduced diffusion limitation and enhanced catalyst efficiency has become a vital focus in the field of zeolites and porous materials chemistry within the past decades. This review will focus on the diffusion and catalyst efficiency of hierarchical zeolites and industrial catalysts. The benefits of diffusion and catalyst efficiency at two levels of hierarchies (zeolitic component level and industrial catalyst level) from a chemical reaction engineering point of view will be analysed. At zeolitic component level, three types of mesopores based on the strategies applied toward enhancing the catalyst effectiveness factor are presented: (i) ‘functional mesopores’ (raising effective diffusivity); (ii) ‘auxiliary mesopores’ (decreasing diffusion length); and (iii) ‘integrated mesopores’ (a combination thereof). At industrial catalyst level, location and interconnectivity among the constitutive components are revealed. The hierarchical pore interconnectivity in multi-component zeolite based industrial catalysts is exemplified by fluid catalytic cracking and bi-functional hydroisomerization catalysts. The rational design of industrial zeolite catalysts at both hierarchical zeolitic component and catalyst body levels can be fully comprehended using the advanced in situ and/or operando spectroscopic, microscopic and diffraction techniques.
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影响因子：
4.7
作者：
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