Preparation of a Hierarchical Pore Zeolite with High-Temperature Calcination and Acid-Base Leaching

Microporous structure in zeolite leads to diffusion limitation, which causes coke formation and is harmful to catalytic reactions. Hierarchical zeolite containing primary microporosity and secondary porosity at the meso- and macroscales has received much attention due to its enhanced mass transport....

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Bibliographic Details
Published in:Clays and clay minerals 2019-08, Vol.67 (4), p.265-274
Main Authors: Wang, Chengdong, Li, Jinhong, Wang, Xiang, Yang, Zhiwei, Huang, Kaiyue
Format: Article
Language:English
Subjects:
Biogeosciences
Crystal defects
Earth and Environmental Science
Earth Sciences
Geochemistry
Heating
Heating rate
High temperature
Leaching
Mass transport
Medicinal Chemistry
Microporosity
Mineralogy
Nanoscale Science and Technology
Porosity
Roasting
Soil Science & Conservation
Zeolites
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Summary:Microporous structure in zeolite leads to diffusion limitation, which causes coke formation and is harmful to catalytic reactions. Hierarchical zeolite containing primary microporosity and secondary porosity at the meso- and macroscales has received much attention due to its enhanced mass transport. Hierarchical Y zeolites were obtained by treating NH 4 -Y zeolite with high-temperature calcining and acid-base leaching. The results demonstrated that the calcined zeolite showed great crystallinity after acid-base leaching. The mechanism of introduction of mesopores was demonstrated in detail. The calcination transformed framework Al to extra-framework Al and enlarged the defect by acid and alkali. The mesopores increased with the calcining temperature and holding time. The relationship between the heating rate and the removal of Al species was non-linear; a heating rate of 100°C/h exhibited good protection for the zeolite structure.
ISSN:0009-8604
1552-8367
DOI:10.1007/s42860-019-00025-0