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CaC2 production from pulverized coke and CaO at low temperatures — reaction mechanisms / Guodong Li in Industrial & engineering chemistry research, Vol. 51 N° 33 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10742-10747 Titre : CaC2 production from pulverized coke and CaO at low temperatures — reaction mechanisms Type de document : texte imprimé Auteurs : Guodong Li, Auteur ; Qingya Liu, Auteur ; Zhenyu Liu, Auteur Année de publication : 2012 Article en page(s) : pp. 10742-10747 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Reaction  mechanism  Low  temperature  Production Résumé : CaC2 production with pulverized feeds was proven viable at temperatures about 400 °C lower than that required by the current electric arc technology (2100―2200 °C), which led to development of an autothemal process. For the purpose of reactor design, the reaction mechanism of coke (C) with CaO at temperatures up to 1750 °C is studied in a thermogravimetric analyzer (TGA) coupled with a mass spectrometer (MS). Results indicate that the reaction of C with CaO generally proceeds in three stages, starting at 1460 °C for CaC2 formation, followed by reaction of CaC2 with CaO and by decomposition of CaC2. The second stage is observable only at the complete consumption of C while the third is controlled by surface evaporation of Ca. Reaction behavior at the surface of coke and CaO particles is proposed, including the three-stage reactions and the role of CaC2―CaO eutectics, that promotes CaO diffusion and CaC2 production. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26286448 [article] CaC2 production from pulverized coke and CaO at low temperatures — reaction mechanisms [texte imprimé] / Guodong Li, Auteur ; Qingya Liu, Auteur ; Zhenyu Liu, Auteur . - 2012 . - pp. 10742-10747. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10742-10747 Mots-clés : Reaction  mechanism  Low  temperature  Production Résumé : CaC2 production with pulverized feeds was proven viable at temperatures about 400 °C lower than that required by the current electric arc technology (2100―2200 °C), which led to development of an autothemal process. For the purpose of reactor design, the reaction mechanism of coke (C) with CaO at temperatures up to 1750 °C is studied in a thermogravimetric analyzer (TGA) coupled with a mass spectrometer (MS). Results indicate that the reaction of C with CaO generally proceeds in three stages, starting at 1460 °C for CaC2 formation, followed by reaction of CaC2 with CaO and by decomposition of CaC2. The second stage is observable only at the complete consumption of C while the third is controlled by surface evaporation of Ca. Reaction behavior at the surface of coke and CaO particles is proposed, including the three-stage reactions and the role of CaC2―CaO eutectics, that promotes CaO diffusion and CaC2 production. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26286448

Honeycomb CuO/Al2O3/cordierite catalyst for selective catalytic reduction of NO by NH3 / Junhua Su in Industrial & engineering chemistry research, Vol. 47 N° 13 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4295–4301 Titre : Honeycomb CuO/Al2O3/cordierite catalyst for selective catalytic reduction of NO by NH3 : effect of Al2O3 coating Type de document : texte imprimé Auteurs : Junhua Su, Auteur ; Qingya Liu, Auteur ; Zhenyu Liu, Auteur ; Zhanggen Huang, Auteur Année de publication : 2008 Article en page(s) : p. 4295–4301 Note générale : Bibliogr. p. 4301 Langues : Anglais (eng) Mots-clés : Al2O3-coated  cordierite;  Honeycomb;  Viscosity;  Grain  size Résumé : Al2O3-coated cordierite has been widely used as a catalyst’s support. In this work, three Al2O3 precursors or alumina sols are studied to understand the effect of type, viscosity, and grain size of the sols and Cl− on properties and SCR activities of honeycomb CuO/Al2O3/cordierite catalysts. X-ray diffraction (XRD), N2 adsorption, scanning electron microscopy and energy dispersive X-ray (SEM-EDX) techniques are used for analyses. Results show that the viscosity and average grain size of the sol have significant influences on the amount and stability of the Al2O3 coating. The sol synthesized from AlCl3 and aluminum is the best among the three sols in terms of less coating cycle, stability of the coating, and selective catalytic reduction (SCR) activity. Cl1− introduced in preparation must be washed out because it deactivates the SCR activity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800105p [article] Honeycomb CuO/Al2O3/cordierite catalyst for selective catalytic reduction of NO by NH3 : effect of Al2O3 coating [texte imprimé] / Junhua Su, Auteur ; Qingya Liu, Auteur ; Zhenyu Liu, Auteur ; Zhanggen Huang, Auteur . - 2008 . - p. 4295–4301. Bibliogr. p. 4301 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4295–4301 Mots-clés : Al2O3-coated  cordierite;  Honeycomb;  Viscosity;  Grain  size Résumé : Al2O3-coated cordierite has been widely used as a catalyst’s support. In this work, three Al2O3 precursors or alumina sols are studied to understand the effect of type, viscosity, and grain size of the sols and Cl− on properties and SCR activities of honeycomb CuO/Al2O3/cordierite catalysts. X-ray diffraction (XRD), N2 adsorption, scanning electron microscopy and energy dispersive X-ray (SEM-EDX) techniques are used for analyses. Results show that the viscosity and average grain size of the sol have significant influences on the amount and stability of the Al2O3 coating. The sol synthesized from AlCl3 and aluminum is the best among the three sols in terms of less coating cycle, stability of the coating, and selective catalytic reduction (SCR) activity. Cl1− introduced in preparation must be washed out because it deactivates the SCR activity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800105p