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Steam catalysis in CaO carbonation under low steam partial pressure / Shaojun Yang in Industrial & engineering chemistry research, Vol. 47 n°12 (Juin 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°12 (Juin 2008) . - p. 4043–4048 Titre : Steam catalysis in CaO carbonation under low steam partial pressure Type de document : texte imprimé Auteurs : Shaojun Yang, Auteur ; Yunhan Xiao, Auteur Année de publication : 2008 Article en page(s) : p. 4043–4048 Note générale : Bibliogr. p. 4047-4048 Langues : Anglais (eng) Mots-clés : CaO  carbonation;  Steam  partial  pressure;  Thermogravimetric  apparatus Résumé : CaO was widely used to capture CO2 in direct hydrogen production process, where steam always existed simultaneously. The effect of steam on CaO carbonation performance under low steam partial pressure was investigated using a pressurized thermogravimetric apparatus. The experimental results revealed that steam improved CaO carbonation performance significantly no matter whether Ca(OH)2 was produced or not. At 823 K and 0.5 MPa of steam partial pressure, effect of steam on CaO carbonation performance could not be attributed mainly to production of Ca(OH)2 because the hydration rate of CaO was very slow. The main reason was steam catalysis in CaO carbonation. Enhancement of steam on CaO carbonation performance without Ca(OH)2 production could not be attributed to improvement of steam on the physical property, but to catalytic effect of steam. Effects of CaO precursors, CO2 partial pressure, steam partial pressure, and temperature with steam addition on CaO carbonation performance were also investigated. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8000265 [article] Steam catalysis in CaO carbonation under low steam partial pressure [texte imprimé] / Shaojun Yang, Auteur ; Yunhan Xiao, Auteur . - 2008 . - p. 4043–4048. Bibliogr. p. 4047-4048 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°12 (Juin 2008) . - p. 4043–4048 Mots-clés : CaO  carbonation;  Steam  partial  pressure;  Thermogravimetric  apparatus Résumé : CaO was widely used to capture CO2 in direct hydrogen production process, where steam always existed simultaneously. The effect of steam on CaO carbonation performance under low steam partial pressure was investigated using a pressurized thermogravimetric apparatus. The experimental results revealed that steam improved CaO carbonation performance significantly no matter whether Ca(OH)2 was produced or not. At 823 K and 0.5 MPa of steam partial pressure, effect of steam on CaO carbonation performance could not be attributed mainly to production of Ca(OH)2 because the hydration rate of CaO was very slow. The main reason was steam catalysis in CaO carbonation. Enhancement of steam on CaO carbonation performance without Ca(OH)2 production could not be attributed to improvement of steam on the physical property, but to catalytic effect of steam. Effects of CaO precursors, CO2 partial pressure, steam partial pressure, and temperature with steam addition on CaO carbonation performance were also investigated. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8000265