Evaluating the activity and stability of perovskite LaMO3-based Pt catalysts in the aqueous phase reforming of glycerol

Inns, Donald R., Mayer, Alexander J., Skukauskas, Vainius, Davies, Thomas E., Callison, June and Kondrat, Simon A. 2021. Evaluating the activity and stability of perovskite LaMO3-based Pt catalysts in the aqueous phase reforming of glycerol. Topics in Catalysis 64 , pp. 992-1009. 10.1007/s11244-021-01449-6

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Abstract

The aqueous phase reforming of glycerol, to hydrogen, alkanes and liquid phase dehydration/dehydrogenation products, was studied over a series of 1 wt% Pt/LaMO3 (where M = Al, Cr, Mn, Fe, Co, Ni) catalysts and compared to a standard 1 wt% Pt/γ-Al2O3 catalyst. The sol–gel combustion synthesis of lanthanum-based perovskites LaMO3 produced pure phase perovskites with surface areas of 8–18 m2g−1. Glycerol conversions were higher than the Pt/γ-Al2O3 (10%) for several perovskite supported catalysts, with the highest being for Pt/LaNiO3 (19%). Perovskite-based catalysts showed reduced alkane formation and significantly increased lactic acid formation compared to the standard catalyst. However, most of the perovskite materials undergo phase separation to LaCO3OH and respective M site oxides with Pt particle migration. The exception being the LaCrO3 support which was found to remain structurally stable. Catalytic performance remained stable over several cycles, for catalysts M = Al, Cr and Ni, despite phase separation of some of these materials. Materials where M site leaching into solution was observed (M = Mn and Co), were found to be catalytically unstable, which was hypothesised to be due to significant loss in support surface area and uncontrolled migration of Pt to the remaining support surface. In the case of Pt/LaNiO3 alloying between the exsoluted Ni and Pt was observed post reaction.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Additional Information:	This article is licensed under a Creative Commons Attribution 4.0 International License
Publisher:	Springer
ISSN:	1022-5528
Funders:	EPSRC
Date of First Compliant Deposit:	14 June 2021
Date of Acceptance:	7 May 2021
Last Modified:	14 Nov 2024 08:48
URI:	https://orca.cardiff.ac.uk/id/eprint/141888

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