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Highly attrition-resistant zinc oxide-based sorbents for H2S removal by spray-drying technique / Joong B. Lee 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. 4455–4464 Titre : Highly attrition-resistant zinc oxide-based sorbents for H2S removal by spray-drying technique Type de document : texte imprimé Auteurs : Joong B. Lee, Auteur ; Jeom-In Baek, Auteur ; Chong K. Ryu, Auteur ; Chang K. Yi, Auteur Année de publication : 2008 Article en page(s) : p. 4455–4464 Note générale : Bibliogr. p. 4463-4464 Langues : Anglais (eng) Mots-clés : ZnO-based  sorbent;  Spray-drying  technique;  ZAC  32N;  ZAC  32SU;  Desulfurization Résumé : A ZnO-based sorbent, ZAC 32N, applicable to transport reactors was successfully prepared by the spray-drying technique. Another sorbent, ZAC 32SU, was prepared by scale-up preparation of ZAC 32N sorbent. The physical properties of the sorbents such as attrition resistance, specific surface area, pore volume, and particle size were extensively characterized and exhibited a good potential for use in transport applications. The chemical reactivity tested in the thermogravimetric analyzer and microreactor exhibited desirable characteristics for effective desulfurization of syngas streams in the range of 450−550 °C. Bench-scale tests for the sorbent ZAC 32SU were performed for a continuous 160 h with a steady solid circulation of 54.6 kg/h. The results showed 99.5%+ desulfurization at 500−550 °C and reasonable regenerability at 550−620 °C. Test results on the physical properties and chemical reactivity indicated that the performance of developed sorbents proved to be outstanding. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie070962f [article] Highly attrition-resistant zinc oxide-based sorbents for H2S removal by spray-drying technique [texte imprimé] / Joong B. Lee, Auteur ; Jeom-In Baek, Auteur ; Chong K. Ryu, Auteur ; Chang K. Yi, Auteur . - 2008 . - p. 4455–4464. Bibliogr. p. 4463-4464 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4455–4464 Mots-clés : ZnO-based  sorbent;  Spray-drying  technique;  ZAC  32N;  ZAC  32SU;  Desulfurization Résumé : A ZnO-based sorbent, ZAC 32N, applicable to transport reactors was successfully prepared by the spray-drying technique. Another sorbent, ZAC 32SU, was prepared by scale-up preparation of ZAC 32N sorbent. The physical properties of the sorbents such as attrition resistance, specific surface area, pore volume, and particle size were extensively characterized and exhibited a good potential for use in transport applications. The chemical reactivity tested in the thermogravimetric analyzer and microreactor exhibited desirable characteristics for effective desulfurization of syngas streams in the range of 450−550 °C. Bench-scale tests for the sorbent ZAC 32SU were performed for a continuous 160 h with a steady solid circulation of 54.6 kg/h. The results showed 99.5%+ desulfurization at 500−550 °C and reasonable regenerability at 550−620 °C. Test results on the physical properties and chemical reactivity indicated that the performance of developed sorbents proved to be outstanding. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie070962f

Sodium-based dry regenerable sorbent for carbon dioxide capture from power plant flue gas / Joong B. Lee 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. 4465–4472 Titre : Sodium-based dry regenerable sorbent for carbon dioxide capture from power plant flue gas Type de document : texte imprimé Auteurs : Joong B. Lee, Auteur ; Chong K. Ryu, Auteur ; Jeom-In Baek, Auteur ; Ji H. Lee, Auteur Année de publication : 2008 Article en page(s) : p. 4465–4472 Note générale : Bibliogr. p. 4471-4472 Langues : Anglais (eng) Mots-clés : Dry  regenerable  sorbent  --  sodium;  Spray-drying  techniques;  CO2  capture Résumé : Dry regenerable sorbent technology is one of the emerging technologies as a cost-effective and energy-efficient technology for CO2 capture from flue gas. Six sodium-based dry regenerable sorbents were prepared by spray-drying techniques. Their physical properties and reactivities were tested to evaluate their applicability to a fluidized-bed or fast transport-bed CO2 capture process. Each sorbents contained 20−50 wt% of Na2CO3 or NaHCO3. All sorbents except for Sorb NX30 were insufficient with either attrition resistance or reactivity, or both properties. Sorb NX30 sorbent satisfied most of the physical requirements for a commercial fluidized-bed reactor process along with good chemical reactivity. Sorb NX30 sorbent had a spherical shape, an average size of 89 μm, a size distribution of 38−250 μm, and a bulk density of approximately 0.87 g/mL. The attrition index (AI) of Sorb NX30 reached below 5% compared to about 20% for commercial fluidized catalytic cracking (FCC) catalysts. CO2 sorption capacity of Sorb NX30 was approximately 10 wt % (>80% sorbent utilization) in the simulated flue gas condition compared with 6 of 30 wt % MEA solution (33% sorbent utilization). All sorbents showed almost-complete regeneration at temperatures less than 120 °C. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie0709638 [article] Sodium-based dry regenerable sorbent for carbon dioxide capture from power plant flue gas [texte imprimé] / Joong B. Lee, Auteur ; Chong K. Ryu, Auteur ; Jeom-In Baek, Auteur ; Ji H. Lee, Auteur . - 2008 . - p. 4465–4472. Bibliogr. p. 4471-4472 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4465–4472 Mots-clés : Dry  regenerable  sorbent  --  sodium;  Spray-drying  techniques;  CO2  capture Résumé : Dry regenerable sorbent technology is one of the emerging technologies as a cost-effective and energy-efficient technology for CO2 capture from flue gas. Six sodium-based dry regenerable sorbents were prepared by spray-drying techniques. Their physical properties and reactivities were tested to evaluate their applicability to a fluidized-bed or fast transport-bed CO2 capture process. Each sorbents contained 20−50 wt% of Na2CO3 or NaHCO3. All sorbents except for Sorb NX30 were insufficient with either attrition resistance or reactivity, or both properties. Sorb NX30 sorbent satisfied most of the physical requirements for a commercial fluidized-bed reactor process along with good chemical reactivity. Sorb NX30 sorbent had a spherical shape, an average size of 89 μm, a size distribution of 38−250 μm, and a bulk density of approximately 0.87 g/mL. The attrition index (AI) of Sorb NX30 reached below 5% compared to about 20% for commercial fluidized catalytic cracking (FCC) catalysts. CO2 sorption capacity of Sorb NX30 was approximately 10 wt % (>80% sorbent utilization) in the simulated flue gas condition compared with 6 of 30 wt % MEA solution (33% sorbent utilization). All sorbents showed almost-complete regeneration at temperatures less than 120 °C. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie0709638