High surface area perovskite materials as functional catalyst supports for glycerol oxidation

Rabiu, Hamza S., Hayward, James S. and Bartley, Jonathan K. ORCID: https://orcid.org/0000-0003-4640-541X 2025. High surface area perovskite materials as functional catalyst supports for glycerol oxidation. Molecular Catalysis 572 , 114750. 10.1016/j.mcat.2024.114750

Preview

PDF - Published Version Available under License Creative Commons Attribution. Download (5MB) | Preview

Abstract

A series lanthanum perovskite supports (LaBO3, where B = Cr, Mn, Fe, Co and Ni) were synthesised using a hard templating methodology with a mesoporous silica template (SBA-15). This methodology produced high surface area perovskites with surface areas of 70–160 m2 g−1. 1 wt% AuPt was added to the perovskite supports using sol immobilisation and the resultant catalysts tested for the oxidation of glycerol. When the AuPt/LaBO3 catalysts were tested for glycerol oxidation the product distributions via either the oxidation mechanism or a dehydration mechanism could be tuned by substituting different transition metals into the B site. In line with previous studies, AuPt/LaMnO3 and AuPt/LaCoO3 gave the highest yield of oxidation products (glyceric acid with small amounts of tartronic acid), AuPt/LaCrO3 gave the highest yield of lactic acid through the dehydration pathway, while AuPt/LaNiO3 and AuPt/LaFeO3 gave a mixture of products from both the oxidation and dehydration pathways. The product distributions were found to change over the course of the reaction due to the relative rates of the two reaction pathways. For all catalysts except AuPt/LaMnO3 the yield of oxidation products stopped after two hours, while all catalysts except AuPt/LaMnO3 continued to produce lactic acid over the whole reaction. This suggests the perovskite supported catalysts are not stable over the course of the reaction. The most interesting behaviour was found for the AuPt/LaFeO3 catalyst that gave a high initial selectivity to tartronic acid, although further studies are needed to elucidate the mechanism fully.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Publisher:	Elsevier
ISSN:	2468-8231
Funders:	The Petroleum Technology Development Fund
Date of First Compliant Deposit:	3 January 2025
Date of Acceptance:	28 November 2024
Last Modified:	07 Jan 2025 12:00
URI:	https://orca.cardiff.ac.uk/id/eprint/174955

Actions (repository staff only)

Edit Item