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Regeneration of field - spent activated carbon catalysts for low - temperature selective catalytic reduction of NOx with NH3 / Jong-Ki Jeon in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011) 

Public ISBD [article]  in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp. 242–248 Titre : Regeneration of field - spent activated carbon catalysts for low - temperature selective catalytic reduction of NOx with NH3 Type de document : texte imprimé Auteurs : Jong-Ki Jeon, Auteur ; Hyeonjoo Kim, Auteur ; Young-Kwon Park, Auteur Année de publication : 2012 Article en page(s) : pp. 242–248 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : Selective  catalytic  reduction  with  NH3  DeNOx  Activated  carbon  Boron  Deactivation  Catalyst  regeneration Résumé : In the process of producing liquid crystal displays (LCD), the emitted NOx is removed over an activated carbon catalyst by using selective catalytic reduction (SCR) with NH3 at low temperature. However, the catalyst rapidly deactivates primarily due to the deposition of boron discharged from the process onto the catalyst. Therefore, this study is aimed at developing an optimal regeneration process to remove boron from field-spent carbon catalysts. The spent carbon catalysts were regenerated by washing with a surfactant followed by drying and calcination. The physicochemical properties before and after the regeneration were investigated by using elemental analysis, TG/DTG (thermogravimetric/differential thermogravimetric) analysis, N2 adsorption–desorption and NH3 TPD (temperature programmed desorption). Spent carbon catalysts demonstrated a drastic decrease in DeNOx activity mainly due to heavy deposition of boron. Boron was accumulated to depths of about 50 μm inside the granule surface of the activated carbons, as evidenced by cross-sectional SEM-EDX analysis. However, catalyst activity and surface area were significantly recovered by removing boron in the regeneration process, and the highest NO conversions were obtained after washing with a non-ionic surfactant in H2O at 70 °C, followed by treatment with N2 at 550 °C. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010692 [article] Regeneration of field - spent activated carbon catalysts for low - temperature selective catalytic reduction of NOx with NH3 [texte imprimé] / Jong-Ki Jeon, Auteur ; Hyeonjoo Kim, Auteur ; Young-Kwon Park, Auteur . - 2012 . - pp. 242–248. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp. 242–248 Mots-clés : Selective  catalytic  reduction  with  NH3  DeNOx  Activated  carbon  Boron  Deactivation  Catalyst  regeneration Résumé : In the process of producing liquid crystal displays (LCD), the emitted NOx is removed over an activated carbon catalyst by using selective catalytic reduction (SCR) with NH3 at low temperature. However, the catalyst rapidly deactivates primarily due to the deposition of boron discharged from the process onto the catalyst. Therefore, this study is aimed at developing an optimal regeneration process to remove boron from field-spent carbon catalysts. The spent carbon catalysts were regenerated by washing with a surfactant followed by drying and calcination. The physicochemical properties before and after the regeneration were investigated by using elemental analysis, TG/DTG (thermogravimetric/differential thermogravimetric) analysis, N2 adsorption–desorption and NH3 TPD (temperature programmed desorption). Spent carbon catalysts demonstrated a drastic decrease in DeNOx activity mainly due to heavy deposition of boron. Boron was accumulated to depths of about 50 μm inside the granule surface of the activated carbons, as evidenced by cross-sectional SEM-EDX analysis. However, catalyst activity and surface area were significantly recovered by removing boron in the regeneration process, and the highest NO conversions were obtained after washing with a non-ionic surfactant in H2O at 70 °C, followed by treatment with N2 at 550 °C. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010692