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Simultaneous decomposition and fixation of F - gases using waste concrete / Atsushi Iizuka in Industrial & engineering chemistry research, Vol. 50 N° 21 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 11808-11814 Titre : Simultaneous decomposition and fixation of F - gases using waste concrete Type de document : texte imprimé Auteurs : Atsushi Iizuka, Auteur ; Hiroaki Ishizaki, Auteur ; Atsushi Mizukoshi, Auteur Année de publication : 2011 Article en page(s) : pp. 11808-11814 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Fixation  gases  Waste  concrete Résumé : Experimental study was conducted on the simultaneous process of decomposition and fixation of fluoride of F-gases. HFC-134a, a hydrofluorocarbon (HFC), used most widely, was selected as a model gas, and its decomposition performances were examined in a tube type reactor with and without waste concrete powder. Decomposition of HFC-134a was observed at temperatures above 500 °C, while no thermal decomposition occurred below 750 °C without waste concrete. The results for the differential type reactor with high SV demonstrated that the calcium reaction ratio in the waste concrete reached about 50 mol % after 10 min of reaction. Thermal decomposition of HFC-134a was promoted by increasing the reaction temperature. The particle size of the waste concrete within the range studied scarcely affected the decomposition rate. An increase in HFC-134a concentration resulted in a higher calcium reaction ratio of waste concrete. For the integral reactor conditions with packed bed of waste concrete, almost all HFC-134a in the feed gas could be decomposed until 20 min of the reaction time. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201727j [article] Simultaneous decomposition and fixation of F - gases using waste concrete [texte imprimé] / Atsushi Iizuka, Auteur ; Hiroaki Ishizaki, Auteur ; Atsushi Mizukoshi, Auteur . - 2011 . - pp. 11808-11814. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 11808-11814 Mots-clés : Fixation  gases  Waste  concrete Résumé : Experimental study was conducted on the simultaneous process of decomposition and fixation of fluoride of F-gases. HFC-134a, a hydrofluorocarbon (HFC), used most widely, was selected as a model gas, and its decomposition performances were examined in a tube type reactor with and without waste concrete powder. Decomposition of HFC-134a was observed at temperatures above 500 °C, while no thermal decomposition occurred below 750 °C without waste concrete. The results for the differential type reactor with high SV demonstrated that the calcium reaction ratio in the waste concrete reached about 50 mol % after 10 min of reaction. Thermal decomposition of HFC-134a was promoted by increasing the reaction temperature. The particle size of the waste concrete within the range studied scarcely affected the decomposition rate. An increase in HFC-134a concentration resulted in a higher calcium reaction ratio of waste concrete. For the integral reactor conditions with packed bed of waste concrete, almost all HFC-134a in the feed gas could be decomposed until 20 min of the reaction time. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201727j