Documents disponibles écrits par cet auteur

Catalytic carbon dioxide reforming of methane to synthesis gas over activated carbon catalyst / Qilei Song 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. 4349–4357 Titre : Catalytic carbon dioxide reforming of methane to synthesis gas over activated carbon catalyst Type de document : texte imprimé Auteurs : Qilei Song, Auteur ; Rui Xiao, Auteur ; Yanbing Li, Auteur ; Laihong Shen, Auteur Année de publication : 2008 Article en page(s) : p. 4349–4357 Note générale : Bibliogr. p. 4357 Langues : Anglais (eng) Mots-clés : Methane;  Catalytic  activity;  Kinetics Résumé : The catalytic activity and kinetic behavior of catalytic reforming of methane with carbon dioxide over activated carbon were investigated as a function of reaction temperature, gas hourly space velocity (GHSV), and partial pressures of CH4 and CO2. The CH4 and CO2 conversions were greatly influenced by the reaction temperature in the range of 850−1050 °C. The apparent activation energies for CH4 and CO2 consumption and CO and H2 production were 32.63 ± 1.06, 25.54 ± 1.79, 24.81 ± 3.06, and 32.99 ± 2.58 kcal/mol, respectively. The curves of reaction rates versus GHSV showed various trends at different temperatures and indicated 7500 mL/h·g-cat was sufficient for operation in the kinetic regime. The reaction rate of methane and carbon dioxide over activated carbon was affected significantly by the partial pressures. Under a higher CO2 pressure, the excess CO2 reacted with H2 through the reverse water−gas shift (RWGS) reaction. The predictions of the CH4 and CO2 reaction rates based on a semiexperimental formula fitted satisfactorily with the experiments data. The results of mass balance, BET, XRD, and SEM studies in the deactivation test indicated that the catalyst deactivation was mainly attributed to the carbon deposition and might be alleviated at high temperatures. On the basis of the experimental results and Langmuir−Hinshelwood mechanism in the literature, a reaction mechanism was proposed. The overall reaction pathway involves the adsorption and cracking of methane and CO2 adsorption and gasification with carbon cracked. The RWGS reaction occurs simultaneously. Overall, a derived semitheoretical kinetic equation satisfactorily predicted the experimental results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800117a [article] Catalytic carbon dioxide reforming of methane to synthesis gas over activated carbon catalyst [texte imprimé] / Qilei Song, Auteur ; Rui Xiao, Auteur ; Yanbing Li, Auteur ; Laihong Shen, Auteur . - 2008 . - p. 4349–4357. Bibliogr. p. 4357 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4349–4357 Mots-clés : Methane;  Catalytic  activity;  Kinetics Résumé : The catalytic activity and kinetic behavior of catalytic reforming of methane with carbon dioxide over activated carbon were investigated as a function of reaction temperature, gas hourly space velocity (GHSV), and partial pressures of CH4 and CO2. The CH4 and CO2 conversions were greatly influenced by the reaction temperature in the range of 850−1050 °C. The apparent activation energies for CH4 and CO2 consumption and CO and H2 production were 32.63 ± 1.06, 25.54 ± 1.79, 24.81 ± 3.06, and 32.99 ± 2.58 kcal/mol, respectively. The curves of reaction rates versus GHSV showed various trends at different temperatures and indicated 7500 mL/h·g-cat was sufficient for operation in the kinetic regime. The reaction rate of methane and carbon dioxide over activated carbon was affected significantly by the partial pressures. Under a higher CO2 pressure, the excess CO2 reacted with H2 through the reverse water−gas shift (RWGS) reaction. The predictions of the CH4 and CO2 reaction rates based on a semiexperimental formula fitted satisfactorily with the experiments data. The results of mass balance, BET, XRD, and SEM studies in the deactivation test indicated that the catalyst deactivation was mainly attributed to the carbon deposition and might be alleviated at high temperatures. On the basis of the experimental results and Langmuir−Hinshelwood mechanism in the literature, a reaction mechanism was proposed. The overall reaction pathway involves the adsorption and cracking of methane and CO2 adsorption and gasification with carbon cracked. The RWGS reaction occurs simultaneously. Overall, a derived semitheoretical kinetic equation satisfactorily predicted the experimental results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800117a

Estimating specific chemical exergy of biomass from basic analysis data / Guohui Song in Industrial & engineering chemistry research, Vol. 50 N° 16 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9758-9766 Titre : Estimating specific chemical exergy of biomass from basic analysis data Type de document : texte imprimé Auteurs : Guohui Song, Auteur ; Laihong Shen, Auteur ; Jun Xiao, Auteur Année de publication : 2011 Article en page(s) : pp. 9758-9766 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Biomass Résumé : Estimation of chemical exergy of biomass is one of the basic steps in performance analysis and optimization of biomass conversion systems. A practical method for estimating specific chemical exergy of biomass on dry basis (db) from basic analysis data was developed on Szargut's reference environment model. The method is based on exergy and entropy equations of reaction, Gibbs free energy relations, a modified estimation of the standard entropy of organic matter in biomass and an assumption about original state of inorganic matter-forming elements in biomass. The method was applied to 86 varieties of biomass, and the statistical results indicate that specific chemical exergy of dry biomass varies in the interval of 11.5―24.2 MJ·kg―1, which is always slightly larger than the higher heat value (HHV) (db). Owing to the relative very small value, the influence of inorganic matter in the form of chemical exergies of ash and oxygen reacting with inorganic matter, and the entropy change in ash formation can be neglected. The average ratio of specific chemical exergy to HHV is 1.047 for dry biomass. Consequently, specific chemical exergy of dry biomass can be conveniently estimated from ultimate analysis data plus ash content (in wt %, db) or HHV. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24425221 [article] Estimating specific chemical exergy of biomass from basic analysis data [texte imprimé] / Guohui Song, Auteur ; Laihong Shen, Auteur ; Jun Xiao, Auteur . - 2011 . - pp. 9758-9766. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9758-9766 Mots-clés : Biomass Résumé : Estimation of chemical exergy of biomass is one of the basic steps in performance analysis and optimization of biomass conversion systems. A practical method for estimating specific chemical exergy of biomass on dry basis (db) from basic analysis data was developed on Szargut's reference environment model. The method is based on exergy and entropy equations of reaction, Gibbs free energy relations, a modified estimation of the standard entropy of organic matter in biomass and an assumption about original state of inorganic matter-forming elements in biomass. The method was applied to 86 varieties of biomass, and the statistical results indicate that specific chemical exergy of dry biomass varies in the interval of 11.5―24.2 MJ·kg―1, which is always slightly larger than the higher heat value (HHV) (db). Owing to the relative very small value, the influence of inorganic matter in the form of chemical exergies of ash and oxygen reacting with inorganic matter, and the entropy change in ash formation can be neglected. The average ratio of specific chemical exergy to HHV is 1.047 for dry biomass. Consequently, specific chemical exergy of dry biomass can be conveniently estimated from ultimate analysis data plus ash content (in wt %, db) or HHV. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24425221

Experimental study of biomass pyrolysis based on three major components / Tingting Qu in Industrial & engineering chemistry research, Vol. 50 N° 18 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10424–10433 Titre : Experimental study of biomass pyrolysis based on three major components : hemicellulose, cellulose, and lignin Type de document : texte imprimé Auteurs : Tingting Qu, Auteur ; Wanjun Guo, Auteur ; Laihong Shen, Auteur Année de publication : 2011 Article en page(s) : pp. 10424–10433 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Biomass  Pyrolysis  Hemicellulose Résumé : Fast pyrolysis of cellulose, xylan, and lignin was experimentally conducted between 350 and 650 °C in a tube furnace, and the effect of temperature on pyrolysis products (char, noncondensable gas, and bio-oil) was investigated. The yields of char, noncondensable gas, and bio-oil were quantified using gas chromatography and gas chromatography with mass spectrometry. The noncondensable gas mainly consists of CO, CO2, CH4, and H2. The bio-oil includes acids, ketones, aldehydes, esters, benzenes, alcohols, alkenes, phenols, alkanels, carbohydrates, etc. The results show that cellulose is the principal source of carbohydrates and phenols are the basis of the bio-oil from lignin, while the bio-oil from xylan mainly consists of acids, ketones, aldehydes, and phenols. The char yields for the three components decrease with an increase in temperature, and the gas yields and bio-oil yields increase with an increase in temperature, reach a maximum at a certain temperature, and then decrease after that temperature. The maximum bio-oil yields for cellulose, xylan, and lignin are 65, 53, and 40%, respectively; and their corresponding temperatures are 400, 450, and 500 °C, respectively. To investigate a relationship between biomass and three major components (hemicellulose, cellulose, and lignin), the pyrolysis of three typical biomass samples (rice straw, corn stalk, and peanut vine) was also studied, and the additivity law is adopted to predict the product components of biomass pyrolysis based on the content of hemicelluloses, cellulose, and lignin. The results show that the additivity law can predict reasonably the trend of product yields of biomass samples from their composition of hemicelluloses, cellulose, and lignin. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1025453 [article] Experimental study of biomass pyrolysis based on three major components : hemicellulose, cellulose, and lignin [texte imprimé] / Tingting Qu, Auteur ; Wanjun Guo, Auteur ; Laihong Shen, Auteur . - 2011 . - pp. 10424–10433. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10424–10433 Mots-clés : Biomass  Pyrolysis  Hemicellulose Résumé : Fast pyrolysis of cellulose, xylan, and lignin was experimentally conducted between 350 and 650 °C in a tube furnace, and the effect of temperature on pyrolysis products (char, noncondensable gas, and bio-oil) was investigated. The yields of char, noncondensable gas, and bio-oil were quantified using gas chromatography and gas chromatography with mass spectrometry. The noncondensable gas mainly consists of CO, CO2, CH4, and H2. The bio-oil includes acids, ketones, aldehydes, esters, benzenes, alcohols, alkenes, phenols, alkanels, carbohydrates, etc. The results show that cellulose is the principal source of carbohydrates and phenols are the basis of the bio-oil from lignin, while the bio-oil from xylan mainly consists of acids, ketones, aldehydes, and phenols. The char yields for the three components decrease with an increase in temperature, and the gas yields and bio-oil yields increase with an increase in temperature, reach a maximum at a certain temperature, and then decrease after that temperature. The maximum bio-oil yields for cellulose, xylan, and lignin are 65, 53, and 40%, respectively; and their corresponding temperatures are 400, 450, and 500 °C, respectively. To investigate a relationship between biomass and three major components (hemicellulose, cellulose, and lignin), the pyrolysis of three typical biomass samples (rice straw, corn stalk, and peanut vine) was also studied, and the additivity law is adopted to predict the product components of biomass pyrolysis based on the content of hemicelluloses, cellulose, and lignin. The results show that the additivity law can predict reasonably the trend of product yields of biomass samples from their composition of hemicelluloses, cellulose, and lignin. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1025453

Hydrogen production from a victorian brown coal with in situ CO2 capture in a 1 kWth dual fluidized-bed gasification r / Hui An in Industrial & engineering chemistry research, Vol. 51 N° 40 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 40 (Octobre 2012) . - pp. 13046–13053 Titre : Hydrogen production from a victorian brown coal with in situ CO2 capture in a 1 kWth dual fluidized-bed gasification r Type de document : texte imprimé Auteurs : Hui An, Auteur ; Tao Song, Auteur ; Laihong Shen, Auteur Année de publication : 2012 Article en page(s) : pp. 13046–13053 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Hydrogen  Gasification Résumé : The removal of CO2 during coal gasification will improve H2 yield by promoting coal gasification reactions toward the production of H2. In this work, coal gasification with in situ CO2 capture has been investigated in a 1 kWth dual fluidized-bed gasification reactor. A Victorian brown coal was used as the feed stock. Coal gasification tests at 700 °C were performed with silica sands as the heat carrier and synthetic CaO sorbent for comparison. It was found that the addition of the sorbent improved H2 concentration in the outlet of the fuel reactor by nearly 53%. Carbon conversion rate was also increased and a maximum of 33% was reported. Calcium aluminate cement was used as a binder for the fabrication of the synthetic CaO sorbent, in an attempt to enhance its mechanical strength and improve its chemical properties. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300747m [article] Hydrogen production from a victorian brown coal with in situ CO2 capture in a 1 kWth dual fluidized-bed gasification r [texte imprimé] / Hui An, Auteur ; Tao Song, Auteur ; Laihong Shen, Auteur . - 2012 . - pp. 13046–13053. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 40 (Octobre 2012) . - pp. 13046–13053 Mots-clés : Hydrogen  Gasification Résumé : The removal of CO2 during coal gasification will improve H2 yield by promoting coal gasification reactions toward the production of H2. In this work, coal gasification with in situ CO2 capture has been investigated in a 1 kWth dual fluidized-bed gasification reactor. A Victorian brown coal was used as the feed stock. Coal gasification tests at 700 °C were performed with silica sands as the heat carrier and synthetic CaO sorbent for comparison. It was found that the addition of the sorbent improved H2 concentration in the outlet of the fuel reactor by nearly 53%. Carbon conversion rate was also increased and a maximum of 33% was reported. Calcium aluminate cement was used as a binder for the fabrication of the synthetic CaO sorbent, in an attempt to enhance its mechanical strength and improve its chemical properties. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300747m

Integrated analysis of energy, economic, and environmental performance of biomethanol from rice straw in China / Jun Xiao in Industrial & engineering chemistry research, Vol. 48 N° 22 (Novembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 9999–10007 Titre : Integrated analysis of energy, economic, and environmental performance of biomethanol from rice straw in China Type de document : texte imprimé Auteurs : Jun Xiao, Auteur ; Laihong Shen, Auteur ; Yanan Zhang, Auteur Année de publication : 2010 Article en page(s) : pp. 9999–10007 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Rice  straw  process  Biomethanol  China Résumé : This paper focuses on a biomethanol from the rice straw process involving the thermodynamic, economic, and environmental performance in China. Based on the simulation of methanol synthesis via biomass gasification in interconnected fluidized beds using Aspen Plus software, the method of LCA (Life Cycle Assessment) is applied to evaluate the impact of pollutant emissions in the full life cycles of biomethanol. The integrated performance of biomethanol system is analyzed combining with energy utilization, economic cost, and environmental impact. The results show that the methanol yield can reach 0.308 kg/(kg rice straw), i.e., the energy efficiency of rice straw conversion to biomethanol is approximately 42.7%. For a biomethanol plant with an annual production of 50,000 tons, the real cost of biomethanol is evaluated at 2685 RMB/t, in which the economic cost is 2347 RMB/t, and the environmental cost is 337.6 RMB/t. Because of its high investment cost, presently the economic cost of biomethanol is higher than that of coal-based methanol in China. Nevertheless biomethanol will be becoming more competitive with the shortage of fossil fuel in the future. In the whole life cycle, the main pollutant emissions come from the biomethanol production process and biomethanol end-use by automobiles, whereas the net environmental effect is negative during the rice cultivation. Global warming is the most influential factor of the different impact categories. However, 1910 kg of CO2 can be fixed for one ton of methanol by photosynthesis in the growth of rice, thus the effect of global warming is significantly reduced by biomass utilization compared with coal-based methanol. The integrated performance indicates that producing methanol from rice straw is beneficial to both the utilization of agriculture waste and in the improvement of environment. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900680d [article] Integrated analysis of energy, economic, and environmental performance of biomethanol from rice straw in China [texte imprimé] / Jun Xiao, Auteur ; Laihong Shen, Auteur ; Yanan Zhang, Auteur . - 2010 . - pp. 9999–10007. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 9999–10007 Mots-clés : Rice  straw  process  Biomethanol  China Résumé : This paper focuses on a biomethanol from the rice straw process involving the thermodynamic, economic, and environmental performance in China. Based on the simulation of methanol synthesis via biomass gasification in interconnected fluidized beds using Aspen Plus software, the method of LCA (Life Cycle Assessment) is applied to evaluate the impact of pollutant emissions in the full life cycles of biomethanol. The integrated performance of biomethanol system is analyzed combining with energy utilization, economic cost, and environmental impact. The results show that the methanol yield can reach 0.308 kg/(kg rice straw), i.e., the energy efficiency of rice straw conversion to biomethanol is approximately 42.7%. For a biomethanol plant with an annual production of 50,000 tons, the real cost of biomethanol is evaluated at 2685 RMB/t, in which the economic cost is 2347 RMB/t, and the environmental cost is 337.6 RMB/t. Because of its high investment cost, presently the economic cost of biomethanol is higher than that of coal-based methanol in China. Nevertheless biomethanol will be becoming more competitive with the shortage of fossil fuel in the future. In the whole life cycle, the main pollutant emissions come from the biomethanol production process and biomethanol end-use by automobiles, whereas the net environmental effect is negative during the rice cultivation. Global warming is the most influential factor of the different impact categories. However, 1910 kg of CO2 can be fixed for one ton of methanol by photosynthesis in the growth of rice, thus the effect of global warming is significantly reduced by biomass utilization compared with coal-based methanol. The integrated performance indicates that producing methanol from rice straw is beneficial to both the utilization of agriculture waste and in the improvement of environment. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900680d

Kinetic model for parallel reactions of CaSO4 with CO in chemical-looping combustion / Min Zheng in Industrial & engineering chemistry research, Vol. 50 N° 9 (Mai 2011) 

Permalink

Simulation of methanol production from biomass gasification in interconnected fluidized beds / Yanan Zhang in Industrial & engineering chemistry research, Vol. 48 N° 11 (Juin 2009) 

Permalink

Use of coal as fuel for chemical-looping combustion with ni-based oxygen carrier / Zhengping Gao in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Permalink