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Article RSE 14007807

Air Plasma Sprayed Catalytic Coatings for Denox Applications

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Advanced Ceramic Coatings and Materials for Extreme Environments II: Ceramic Engineering and Science Proceedings, vol. 35, Issue 8, pp. 127-1282014.

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A. Moscatelli (Flame Spray), F. Cernuschi (RSE SpA) , M. Notaro (RSE SpA) , S. Capelli (RSE SpA)

BIOMASSE 2014 - Electricity from biomass

In this work, different morphologies of precursors and microstructure of catalytic coatings for NOx reduction have been investigated and the catalytic reduction efficiency of coating has been evaluated to select the best solution. The first results of the development of air plasma sprayed catalytic coatings will be presented.

The selective catalytic reduction (SCR) of NOx by ammonia is the best-developed and most widely applied method for removing those pollutants present within the flue gases of fossil fuelled power plants and engines. Commercial catalysts are mainly composed of TiO2, WO3 and V2O5 plus other compounds without catalytic function.TiO2 in the anatase form acts as high specific surface support material and shows the most effective dispersive capacity for the catalytically active phases (V2O5 and WO3).

Nowadays the installation of SCR DeNOx plants is usually limited to coal, oil and waste fired power plants. In fact, NOx emissions of natural gas combined cycles are still below the threshold fixed by the law but if this threshold will be further reduced, combined cycles will have to be equipped with DeNOX plants or with very low NOx burners. On the other hand, to upgrade the existing plants, a retrofitting technology is required.

In this perspective, a possible solution would consist in depositing a catalytic coating on heat exchange pipes in the heat recovery steam boiler of combined cycle power plants in the region where the temperatures of flue gases are within the range of operation of the catalyst. In this work, different morphologies of precursors and microstructure of coatings have been investigated and the catalytic reduction efficiency of coating has been evaluated to select the best solution. The first results of the development of air plasma sprayed catalytic coatings will be presented.

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