Preferential oxidation of CO on a La-Co-Ru perovskite-type oxide catalyst

A Ru-containing perovskite-type oxide La(Co,Ru)O3 of nominal composition LaCo0.8Ru0.2O3 was prepared by ultrasonic spray combustion and tested for the preferential oxidation of CO (PROX). EXAFS indicated that Ru adopted the coordination environment of Co in LaCoO3 while Co was present as LaCoO3 and...

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Bibliographic Details
Published in:Catalysis communications 2017-03, Vol.92, p.75-79
Main Authors: Pereñíguez, Rosa, Caballero, Alfonso, Ferri, Davide
Format: Article
Language:English
Subjects:
CO methanation
LaCoO3
PROX
Reduction
Structural regeneration
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Summary:A Ru-containing perovskite-type oxide La(Co,Ru)O3 of nominal composition LaCo0.8Ru0.2O3 was prepared by ultrasonic spray combustion and tested for the preferential oxidation of CO (PROX). EXAFS indicated that Ru adopted the coordination environment of Co in LaCoO3 while Co was present as LaCoO3 and Co3O4. PROX activity was replaced by CO hydrogenation activity above 250°C. Short oxidation at 500°C between temperature programmed reaction ramps did not restore the initial La(Co,Ru)O3 structure but generated a catalyst with improved PROX activity compared to the initial La(Co,Ru)O3. Under reductive PROX conditions the material experienced structural changes that improved its overall catalytic activity only if the catalyst was oxidized after each temperature programmed ramp. [Display omitted] •La(Co,Ru)O3 was produced by ultrasonic spray combustion.•Ru adopts the coordination environment of the B-site.•Structural changes induced by reducing PROX conditions generate an active catalyst.•The original structure is regenerated by oxidation, thus enabling reuse of the catalyst.•Depending on temperature range, PROX or CO hydrogenation occur.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2016.12.020