Contrasting Structure-Property Relationships in Amorphous, Hierarchical and Microporous Aluminophosphate Catalysts for Claisen-Schmidt Condensation Reactions

Hamza Annath*, Jinesh C. Manayil, Jillian Thompson, Andrew C. Marr, Robert Raja

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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.
Original languageEnglish
Article number118376
JournalApplied Catalysis A: General
Early online date22 Sep 2021
DOIs
Publication statusE-pub ahead of print - 22 Sep 2021

Bibliographical note

© 2021, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Funding: This work was supported by the EPSRC U.K. Catalysis Hub through Grant EP/K014714/1; they are kindly thanked for the resources and support provided via our membership of the U.K. Catalysis Hub Consortium. JCM thanks BBSRC GCRF grant (BB/P022685/1) for financial support.

Keywords

  • Amorphous and crystalline catalysts
  • Aluminophosphate
  • Hierarchically porous
  • Chalcones
  • Claisen-Schmidt condensation

Fingerprint

Dive into the research topics of 'Contrasting Structure-Property Relationships in Amorphous, Hierarchical and Microporous Aluminophosphate Catalysts for Claisen-Schmidt Condensation Reactions'. Together they form a unique fingerprint.

Cite this