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

DOI: 10.1007/s11244-021-01449-6 DOI Help

Authors: Donald R. Inns (Loughborough University) , Alexander J. Mayer (Loughborough University; Diamond Light Source) , Vainius Skukauskas (University of Glasgow; Research Complex at Harwell) , Thomas E. Davies (Cardiff Catalysis Institute, Cardiff University) , June Callison (UK Catalysis Hub, Research Complex at Harwell; Cardiff Catalysis Institute, Cardiff University) , Simon A. Kondrat (Loughborough University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Topics In Catalysis , VOL 33

State: Published (Approved)
Published: May 2021
Diamond Proposal Number(s): 198590

Open Access Open Access

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.

Journal Keywords: Perovskite supported catalyst; Hydrothermal deactivation; Hydrogen production; Aqueous phase reforming

Diamond Keywords: Fuel Cells

Subject Areas: Materials, Chemistry, Environment


Instruments: B18-Core EXAFS

Added On: 25/05/2021 10:05

Discipline Tags:

Earth Sciences & Environment Sustainable Energy Systems Energy Climate Change Physical Chemistry Catalysis Chemistry Materials Science Perovskites Metallurgy

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS)