Washcoating vs. direct synthesis of LaCoO3 on monoliths for environmental applications

• LaCoO3/monolith systems are obtained by comparing different deposition procedures.
• A new direct synthesis method is developed and compared with traditional washcoating.
• Direct synthesis yields uniformly coated composites as active as LaCoO3 powders.
• LaCoO3/monolith: interface and growing mechanisms.
• Direct synthesis: simple, sustainable, fast, reproducible alternative to washcoating.

A “citrate route”-derived procedure to directly synthesize perovskite catalysts on a cordierite monolith has been developed as a simple, sustainable, fast and reproducible alternative to washcoating. The procedure has been validated with LaCoO3, a well-established perovskite active for oxidation reactions. The activity of LaCoO3 directly synthesized on monolith towards CO and C3s oxidation has been compared both with LaCoO3 powders and LaCoO3/monolith systems obtained by traditional, optimized washcoating procedure. It has been proved that the direct synthesis of the perovskite on the cordierite monolith results in a very uniform, stable catalyst coating, with the same specific activity of powders.

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