Contrasting structure-property relationships in amorphous, hierarchical and microporous aluminophosphate catalysts for Claisen-Schmidt condensation reactions

Annath, Hamza and Manayil, Jinesh C. and Thompson, Jillian and Marr, Andrew C. and Raja, Robert (2021) Contrasting structure-property relationships in amorphous, hierarchical and microporous aluminophosphate catalysts for Claisen-Schmidt condensation reactions. Applied Catalysis A: General, 627. ISSN 0926-860X

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Abstract

Amorphous aluminophosphates are industrial catalysts that are active in aldol-type condensations, dehydration and alkylation. The intrinsic nature of the active sites present in these materials is poorly understood. Herein we report a comparative investigation of the catalytic active sites in amorphous and crystalline aluminophosphates (AFI topology) and their corresponding iron-containing analogues, employing Claisen-Schmidt condensation of acetophenone and benzaldehyde as the test reaction. Secondary porosity generated via the soft-templating approach in hierarchically-porous HP FeAlPO-5, and the presence of large mesopores in amorphous Am FeAlPO resulted in improved mass-transport and high conversion of carbonyls. The nature and concentration of the active acidic sites within these materials were characterized by pyridine-DRIFTS and propylamine-TPD studies and was shown to play a crucial role in the activation of carbonyl groups and better catalytic performance. Am FeAlPO(5) nearly outperformed HP FeAlPO-5, thus providing a promising alternative for expanding scope in industrial and pharmaceutical applications.

Item Type:
Journal Article
Journal or Publication Title:
Applied Catalysis A: General
Additional Information:
Author was employed at another UK HEI at the time of submission and was deposited at Queens University Belfast Repository, see link https://pure.qub.ac.uk/en/publications/contrasting-structure-property-relationships-in-amorphous-hierarc
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1500/1508
Subjects:
ID Code:
171768
Deposited By:
Deposited On:
14 Jun 2022 09:30
Refereed?:
Yes
Published?:
Published
Last Modified:
22 Nov 2022 11:33