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Enhancing interfacial synergies for the preparation of high mechanical strength and interconnected porosity of alumina extrudates through pre-wetting method

The forming of catalyst supports is a crucial step in the application of industrial catalysts. Alumina, a widely employed catalyst support, is often shaped using nitric acid as a peptizer to enhance mechanical strength. However, the use of large amounts of nitric acid typically results in a decrease...

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Published in:Microporous and mesoporous materials 2024-05, Vol.372, p.113108, Article 113108
Main Authors: Wu, Fan, Wang, Hong-Lei, Zhou, Shu-Zhen, Wang, Xu, Xu, Hong-Liang, Lu, An-Hui
Format: Article
Language:English
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Summary:The forming of catalyst supports is a crucial step in the application of industrial catalysts. Alumina, a widely employed catalyst support, is often shaped using nitric acid as a peptizer to enhance mechanical strength. However, the use of large amounts of nitric acid typically results in a decrease in specific surface area and damage to the pore structure due to chemical corrosion. In this work, we present a more practical approach that is pre-filling the open pores of pseudo-boehmite powder with water instead of directly filling them with nitric acid solution. The binder with a small quantity of nitric acid plays a synergistic role in functioning as a glue on the particle surfaces. And through this method, high-strength (231 N cm−1) alumina support can be prepared more efficiently through extrusion. Besides, the pore structure of the extrudates was characterized by multi-scale methods, including nitrogen physical sorption and XRM (X-ray microscopy), which revealed abundant interconnected hierarchical pores deriving from the pre-wetting shaping process. This proposed approach enables the attainment of high mechanical strength and interconnected porosity for alumina extrudates with less use of acid, which holds a significant practical application value. [Display omitted] •A high-performance alumina extrudate was prepared by a pre-wetting method.•The mechanical strength and water absorption of alumina extrudates were improved.•The pre-wetting method significantly reduced the amount of acid used.•Multi-scale visual characterizations revealed abundant interconnected pores in the alumina extrudates.
ISSN:1387-1811
1873-3093
DOI:10.1016/j.micromeso.2024.113108