期刊
NATIONAL SCIENCE REVIEW
卷 7, 期 11, 页码 1726-1742出版社
OXFORD UNIV PRESS
DOI: 10.1093/nsr/nwaa184
关键词
diffusion; effectiveness factor; pore connectivity; hierarchical zeolite; industrial catalyst; advanced characterization
资金
- K. C. Wong Education Foundation
- Sino-French International Laboratory (LIA) 'Zeolites'
- Thousand Talents Program for Foreign Experts [WQ20152100284]
- Key Projects of China National Key RD Plan [2018YFE0118200]
- Key Projects of Shandong Provincial Key RD Plan [2019JZZY010506]
- Major Projects of PetroChina on Catalysts of Oil Processing [2016E-0707]
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 op erando spectroscopic, microscopic and diffraction techniques.
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