Catalytic Properties of Double Substituted Lanthanum Cobaltite Nanostructured Coatings Prepared by Reactive Magnetron Sputtering

Lanthanum perovskites are promising candidates to replace platinum group metal (PGM), especially regarding catalytic oxidation reactions. We have prepared thin catalytic coatings of Sr and Ag doped lanthanum perovskite by using the cathodic co-sputtering magnetron method in reactive condition. Such...

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Bibliographic Details
Published in:Catalysts 2019-04, Vol.9 (4), p.381-395
Main Authors: Mohammad Arab Pour Yazdi, Lizarraga, Leonardo, Vernoux, Philippe, Billard, Alain, Briois, Pascal
Format: Article
Language:English
Subjects:
Acoustics
Alumina
Aluminum oxide
Carbon monoxide
Catalysts
Catalytic activity
catalytic coating
Catalytic oxidation
cathodic sputtering method
Chemical reactions
Chemical vapor deposition
CO oxidation
Coatings
Crystallization
Engineering Sciences
Exhaust gases
Gas mixtures
Indoor air quality
Lanthanum
Magnetron sputtering
Materials
Micro and nanotechnologies
Microelectronics
Morphology
Nanostructure
Oxidation
perovskite
Perovskites
Platinum metals
Pollutants
Porous materials
Raw materials
Silver
Substrates
Thin films
Vapor phases
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Summary:Lanthanum perovskites are promising candidates to replace platinum group metal (PGM), especially regarding catalytic oxidation reactions. We have prepared thin catalytic coatings of Sr and Ag doped lanthanum perovskite by using the cathodic co-sputtering magnetron method in reactive condition. Such development of catalytic films may optimize the surface/bulk ratio to save raw materials, since a porous coating can combine a large exchange surface with the gas phase with an extremely low loading. The sputtering deposition process was optimized to generate crystallized and thin perovskites films on alumina substrates. We found that high Ag contents has a strong impact on the morphology of the coatings. High Ag loadings favor the growth of covering films with a porous wire-like morphology showing a good catalytic activity for CO oxidation. The most active composition displays similar catalytic performances than those of a Pt film. In addition, this porous coating is also efficient for CO and NO oxidation in a simulated Diesel exhaust gas mixture, demonstrating the promising catalytic properties of such nanostructured thin sputtered perovskite films.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal9040381