Documents disponibles écrits par cet auteur

Displacement behavior of CH4 adsorbed on coals by injecting pure CO2, N2, and CO2-N2 mixture / Dengfeng Zhang in Industrial & engineering chemistry research, Vol. 50 N° 14 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8744-8752 Titre : Displacement behavior of CH4 adsorbed on coals by injecting pure CO2, N2, and CO2-N2 mixture Type de document : texte imprimé Auteurs : Dengfeng Zhang, Auteur ; Songgeng Li, Auteur ; Yongjun Cui, Auteur Année de publication : 2011 Article en page(s) : pp. 8744-8752 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Asia  Far  East  sedimentary  rocks  carbonaceous  rocks  Hokkaido  Japan  gaseous  phase  coalbed  methane  experimental  studies  greenhouse  gas  injection  desorption  density  underground  storage  pressure  sorption  models  nitrogen  methane  carbon  dioxide  isotherms  adsorption  coal  displacements Résumé : Gas adsorption isotherms of Akabira coals were established for pure carbon dioxide (CO2), methane (CH4), and nitrogen (N2). Experimental data fit well into the Langmuir model. The ratio of sorption capacity of CO2, CH4, and N2 is 8.5:3.5:1 at a lower pressure (1.2 MPa) regime and becomes 5.5:2:1 when gas pressure increases to 6.0 MPa. The difference in sorption capacity of these three gases is explained by differences in the density of the three gases with increasing pressure. A coal-methane system partially saturated with CH4 at 2.4 MPa adsorption pressure was experimentally studied. Desorption behavior of CH4 by injecting pure CO2 (at 3.0, 4.0, 5.0, and 6.0 MPa), and by injecting the CO2-N2 mixture and pure N2(at 3.0 and 6.0 MPa) were evaluated. Results indicate that the preferential sorption property of coal for CO2 is significantly higher than that for CH4 or N2. CO2 injection can displace almost all of the CH4adsorbed on coal. When modeling the CH4-CO2 binary and CH2-CO2-N2 ternary adsorption system by using the extended Langmuir (EL) equation, the EL model always over-predicted the sorbed CO2 value with a lower error, while under-predicting the sorbed CH4 with a higher error. A part of CO2 may dissolve into the solid organic structure of coal, besides its competitive adsorption with other gases. According to this explanation, the EL coefficients of CO2 in EL equation were revised. The revised EL model proved to be very accurate in predicting sorbed ratio of multicomponent gases on coals. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=17488723 [article] Displacement behavior of CH4 adsorbed on coals by injecting pure CO2, N2, and CO2-N2 mixture [texte imprimé] / Dengfeng Zhang, Auteur ; Songgeng Li, Auteur ; Yongjun Cui, Auteur . - 2011 . - pp. 8744-8752. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8744-8752 Mots-clés : Asia  Far  East  sedimentary  rocks  carbonaceous  rocks  Hokkaido  Japan  gaseous  phase  coalbed  methane  experimental  studies  greenhouse  gas  injection  desorption  density  underground  storage  pressure  sorption  models  nitrogen  methane  carbon  dioxide  isotherms  adsorption  coal  displacements Résumé : Gas adsorption isotherms of Akabira coals were established for pure carbon dioxide (CO2), methane (CH4), and nitrogen (N2). Experimental data fit well into the Langmuir model. The ratio of sorption capacity of CO2, CH4, and N2 is 8.5:3.5:1 at a lower pressure (1.2 MPa) regime and becomes 5.5:2:1 when gas pressure increases to 6.0 MPa. The difference in sorption capacity of these three gases is explained by differences in the density of the three gases with increasing pressure. A coal-methane system partially saturated with CH4 at 2.4 MPa adsorption pressure was experimentally studied. Desorption behavior of CH4 by injecting pure CO2 (at 3.0, 4.0, 5.0, and 6.0 MPa), and by injecting the CO2-N2 mixture and pure N2(at 3.0 and 6.0 MPa) were evaluated. Results indicate that the preferential sorption property of coal for CO2 is significantly higher than that for CH4 or N2. CO2 injection can displace almost all of the CH4adsorbed on coal. When modeling the CH4-CO2 binary and CH2-CO2-N2 ternary adsorption system by using the extended Langmuir (EL) equation, the EL model always over-predicted the sorbed CO2 value with a lower error, while under-predicting the sorbed CH4 with a higher error. A part of CO2 may dissolve into the solid organic structure of coal, besides its competitive adsorption with other gases. According to this explanation, the EL coefficients of CO2 in EL equation were revised. The revised EL model proved to be very accurate in predicting sorbed ratio of multicomponent gases on coals. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=17488723

Oxidative dehydrogenation of ethane to ethylene with CO2 over Fe-Cr/ZrO2 catalysts / Shuang Deng in Industrial & engineering chemistry research, Vol. 48 N° 16 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 16 (Août 2009) . - pp. 7561–7566 Titre : Oxidative dehydrogenation of ethane to ethylene with CO2 over Fe-Cr/ZrO2 catalysts Type de document : texte imprimé Auteurs : Shuang Deng, Auteur ; Songgeng Li, Auteur ; Huiquan Li, Auteur Année de publication : 2009 Article en page(s) : pp. 7561–7566 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Fe−Cr/ZrO2  catalysts  Thermogravimetric  analysis  Ethylene  Ethane  Dehydrogenation Résumé : The catalytic performance of Fe−Cr/ZrO2 catalysts, prepared by two different methods—coprecipitation and coprecipitation−impregnation were examined in oxidative dehydrogenation of ethane to ethylene using CO2 as an oxidant. Thermogravimetric analysis and physicochemical characterization such as XPS, XRD, and BET were performed to explore the correlation of catalytic performance with physicochemical properties of the catalysts. Catalytic tests show that Fe−Cr/ZrO2 catalysts prepared by coprecipitation−impregnation have higher catalytic stability, higher CO2 conversion, and lower ethylene selectivity in comparison to Fe−Cr/ZrO2 prepared by coprecipitation. The characterization results indicate that the dehydrogenation of ethane is activated by Cr3+ species and Fe3O4 is formed during the reaction, which can promote the reverse WGS reaction. Coke deposition is the main reason of the deactivation of the catalysts. A possible reaction mechanism was proposed on the basis of these results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9007387 [article] Oxidative dehydrogenation of ethane to ethylene with CO2 over Fe-Cr/ZrO2 catalysts [texte imprimé] / Shuang Deng, Auteur ; Songgeng Li, Auteur ; Huiquan Li, Auteur . - 2009 . - pp. 7561–7566. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 16 (Août 2009) . - pp. 7561–7566 Mots-clés : Fe−Cr/ZrO2  catalysts  Thermogravimetric  analysis  Ethylene  Ethane  Dehydrogenation Résumé : The catalytic performance of Fe−Cr/ZrO2 catalysts, prepared by two different methods—coprecipitation and coprecipitation−impregnation were examined in oxidative dehydrogenation of ethane to ethylene using CO2 as an oxidant. Thermogravimetric analysis and physicochemical characterization such as XPS, XRD, and BET were performed to explore the correlation of catalytic performance with physicochemical properties of the catalysts. Catalytic tests show that Fe−Cr/ZrO2 catalysts prepared by coprecipitation−impregnation have higher catalytic stability, higher CO2 conversion, and lower ethylene selectivity in comparison to Fe−Cr/ZrO2 prepared by coprecipitation. The characterization results indicate that the dehydrogenation of ethane is activated by Cr3+ species and Fe3O4 is formed during the reaction, which can promote the reverse WGS reaction. Coke deposition is the main reason of the deactivation of the catalysts. A possible reaction mechanism was proposed on the basis of these results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9007387

Subpilot demonstration of the carbonation − calcination reaction (CCR) process / William Wang in Industrial & engineering chemistry research, Vol. 49 N° 11 (Juin 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5094–5101 Titre : Subpilot demonstration of the carbonation − calcination reaction (CCR) process : high - temperature CO2 and sulfur capture from coal - fired power plants Type de document : texte imprimé Auteurs : William Wang, Auteur ; Shwetha Ramkumar, Auteur ; Songgeng Li, Auteur Année de publication : 2010 Article en page(s) : pp. 5094–5101 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Carbonation  calcination  reaction  High  temperature. Résumé : Increasing concerns over growing CO2 levels in the atmosphere have led to a worldwide demand for efficient, cost-effective, and clean carbon capture technologies. One of these technologies is the Carbonation−Calcination Reaction (CCR) process, which utilizes a calcium-based sorbent in a high-temperature reaction (carbonation) to capture the CO2 from the flue gas stream and releases a pure stream of CO2 in the subsequent calcination reaction that can be sequestered. A 120 KWth subpilot-scale combustion plant utilizing coal at 20 pph along with natural gas has been established at The Ohio State University to test the CCR process. Experimental studies on CO2 capture using calcium-based sorbents have been performed at this facility. Greater than 99% CO2 and SO2 capture has been achieved at the subpilot-scale facility on a once-through basis at a Ca:C mole ratio of 1.6. In addition, the sorbent reactivity is maintained over multiple cycles by the incorporation of a sorbent reactivation hydration step in the carbonation−calcination cycle. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901509k [article] Subpilot demonstration of the carbonation − calcination reaction (CCR) process : high - temperature CO2 and sulfur capture from coal - fired power plants [texte imprimé] / William Wang, Auteur ; Shwetha Ramkumar, Auteur ; Songgeng Li, Auteur . - 2010 . - pp. 5094–5101. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5094–5101 Mots-clés : Carbonation  calcination  reaction  High  temperature. Résumé : Increasing concerns over growing CO2 levels in the atmosphere have led to a worldwide demand for efficient, cost-effective, and clean carbon capture technologies. One of these technologies is the Carbonation−Calcination Reaction (CCR) process, which utilizes a calcium-based sorbent in a high-temperature reaction (carbonation) to capture the CO2 from the flue gas stream and releases a pure stream of CO2 in the subsequent calcination reaction that can be sequestered. A 120 KWth subpilot-scale combustion plant utilizing coal at 20 pph along with natural gas has been established at The Ohio State University to test the CCR process. Experimental studies on CO2 capture using calcium-based sorbents have been performed at this facility. Greater than 99% CO2 and SO2 capture has been achieved at the subpilot-scale facility on a once-through basis at a Ca:C mole ratio of 1.6. In addition, the sorbent reactivity is maintained over multiple cycles by the incorporation of a sorbent reactivation hydration step in the carbonation−calcination cycle. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901509k