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SO 2 deactivation mechanism of NO oxidation and regeneration of the LaCoO 3 perovskit

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SO 2 deactivation mechanism of NO oxidation and

regeneration of the LaCoO 3 perovskite

Authors

Ferenc Martinovic, Quang Nguyen Tran, Fabio Alessandro Deorsola, Samir Bensaid, Regina Palkovits, Werner Paulus, Barbara Bonelli, Francesco Di Renzo, Raffaele Pirone

Publication date

2020

Journal

Catalysis Science & Technology

Volume 10 Issue 7 Pages 2193-2202 Publisher

Royal Society of Chemistry

Description

The deactivation mechanism and methods to cope with the poisoning by SO2 of LaCoO3 perovskite-based NO oxidation catalysts were investigated. The LaCoO3 perovskite was synthesized by a sol–gel method and the fresh, sulphate-deactivated and regenerated catalysts were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, H2-and soot-temperature programmed reduction, temperature programmed desorption and diffuse reflectance infrared Fourier transform spectroscopy. The SO2 poisoning strongly affected the NO oxidation activity. It was demonstrated that the deactivation mechanism proceeds in two stages: initially the active sites with a basic character are blocked by SO3 and subsequently the lanthanum sulphate salts grow progressively on the surface and cobalt is unaffected. Above 500 °C, the surface bound sulphates become mobile and migrate into the bulk of the catalyst. Several …

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