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Sulfur poisoning and regeneration of NOx storage − reduction Cu/K2Ti2O5 catalyst / Qiang Wang in Industrial & engineering chemistry research, Vol. 49 N° 16 (Août 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7330–7335 Titre : Sulfur poisoning and regeneration of NOx storage − reduction Cu/K2Ti2O5 catalyst Type de document : texte imprimé Auteurs : Qiang Wang, Auteur ; Jiahua Zhu, Auteur ; Suying Wei, Auteur Année de publication : 2010 Article en page(s) : pp. 7330–7335 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalyst Résumé : A new Cu/K2Ti2O5 catalyst has been developed recently to remove NOx through the NOx storage−reduction (NSR) process. However, its NSR performance in the presence of sulfur has not been investigated. In this article, the sulfur poisoning of the NOx storage−reduction catalyst Cu/K2Ti2O5 and the corresponding deactivation mechanisms are reported for the first time. The effect of the sulfur concentration, adsorption/regeneration cycling tests, and temperature-programmed regeneration are studied. At low temperatures, the poisoning effect is negligible when the SO2 concentration is lower than 20 ppm, and the sulfated samples can be easily regenerated by 3.5% H2 at 550 °C. However, at high temperatures, the sulfur species are adsorbed on K+ sites to form K2SO4 and, consequently, induce a structure transformation from K2Ti2O5 to K2Ti6O13 nanoparticles. The structural change is reversible, and the sulfated catalyst can be regenerated by hydrogen at 650−700 °C. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1009525 [article] Sulfur poisoning and regeneration of NOx storage − reduction Cu/K2Ti2O5 catalyst [texte imprimé] / Qiang Wang, Auteur ; Jiahua Zhu, Auteur ; Suying Wei, Auteur . - 2010 . - pp. 7330–7335. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7330–7335 Mots-clés : Catalyst Résumé : A new Cu/K2Ti2O5 catalyst has been developed recently to remove NOx through the NOx storage−reduction (NSR) process. However, its NSR performance in the presence of sulfur has not been investigated. In this article, the sulfur poisoning of the NOx storage−reduction catalyst Cu/K2Ti2O5 and the corresponding deactivation mechanisms are reported for the first time. The effect of the sulfur concentration, adsorption/regeneration cycling tests, and temperature-programmed regeneration are studied. At low temperatures, the poisoning effect is negligible when the SO2 concentration is lower than 20 ppm, and the sulfated samples can be easily regenerated by 3.5% H2 at 550 °C. However, at high temperatures, the sulfur species are adsorbed on K+ sites to form K2SO4 and, consequently, induce a structure transformation from K2Ti2O5 to K2Ti6O13 nanoparticles. The structural change is reversible, and the sulfated catalyst can be regenerated by hydrogen at 650−700 °C. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1009525