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Chelating resins silica gel supported aminophosphonic acids prepared by a heterogeneous synthesis method and a homogeneous synthesis method and the removal properties for Hg(II) from aqueous solutions / Zengdi Wang in Industrial & engineering chemistry research, Vol. 51 N° 25 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 25 (Juin 2012) . - pp. 8598-8607 Titre : Chelating resins silica gel supported aminophosphonic acids prepared by a heterogeneous synthesis method and a homogeneous synthesis method and the removal properties for Hg(II) from aqueous solutions Type de document : texte imprimé Auteurs : Zengdi Wang, Auteur ; Ping Yin, Auteur ; Zhi Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 8598-8607 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Aqueous  solution  Silica  gel Résumé : Two kinds of composites silica gel supported by aminophosphonic acids SG-T-P-1 and SG-T-P-2 were prepared successfully by functionalization of silica gel via a heterogeneous synthesis method and a homogeneous synthesis method, respectively, and they were characterized by infrared spectra (IR), scanning electron microscope (SEM), and energy dispersive X-ray analysis system spectrum (EDXAS). Moreover, the static adsorption capabilities of these two chelating resins toward transition-metal ions were studied. Our objective was to choose the adsorbent with high adsorption capacities via different synthesis methods, and the results showed that SG-T-P prepared via a homogeneous synthesis method had excellent adsorption capacities and high adsorption selectivity for Hg(II) ions. The Langmuir model was better than the Freundlich model to fit the adsorption isotherms of SG-T-P for Hg(II), and the maximum adsorption capacity was 303.03 mg/g at 15 °C. Thus, the novel chelating resin silica gel supported by aminophosphonic acids SG-T-P prepared by a homogeneous synthesis method is favorable and useful for the removal of Hg(II) ions from aqueous solutions. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26066786 [article] Chelating resins silica gel supported aminophosphonic acids prepared by a heterogeneous synthesis method and a homogeneous synthesis method and the removal properties for Hg(II) from aqueous solutions [texte imprimé] / Zengdi Wang, Auteur ; Ping Yin, Auteur ; Zhi Wang, Auteur . - 2012 . - pp. 8598-8607. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 25 (Juin 2012) . - pp. 8598-8607 Mots-clés : Aqueous  solution  Silica  gel Résumé : Two kinds of composites silica gel supported by aminophosphonic acids SG-T-P-1 and SG-T-P-2 were prepared successfully by functionalization of silica gel via a heterogeneous synthesis method and a homogeneous synthesis method, respectively, and they were characterized by infrared spectra (IR), scanning electron microscope (SEM), and energy dispersive X-ray analysis system spectrum (EDXAS). Moreover, the static adsorption capabilities of these two chelating resins toward transition-metal ions were studied. Our objective was to choose the adsorbent with high adsorption capacities via different synthesis methods, and the results showed that SG-T-P prepared via a homogeneous synthesis method had excellent adsorption capacities and high adsorption selectivity for Hg(II) ions. The Langmuir model was better than the Freundlich model to fit the adsorption isotherms of SG-T-P for Hg(II), and the maximum adsorption capacity was 303.03 mg/g at 15 °C. Thus, the novel chelating resin silica gel supported by aminophosphonic acids SG-T-P prepared by a homogeneous synthesis method is favorable and useful for the removal of Hg(II) ions from aqueous solutions. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26066786

Kinetics and mechanism study of Low-temperature selective catalytic reduction of NO with urea supported on pitch-based spherical activated carbon / Zhi Wang in Industrial & engineering chemistry research, Vol. 50 N° 10 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6017–6027 Titre : Kinetics and mechanism study of Low-temperature selective catalytic reduction of NO with urea supported on pitch-based spherical activated carbon Type de document : texte imprimé Auteurs : Zhi Wang, Auteur ; Yanli Wang, Auteur ; Donghui Long, Auteur Année de publication : 2011 Article en page(s) : pp. 6017–6027 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Kinetics  Mechanism  Catalytic  reduction Résumé : The kinetics and mechanism of selective catalytic reduction (SCR) of NO with urea supported on pitch-based spherical activated carbons (PSACs) were studied at low temperatures. NO oxidation to NO2 catalyzed by the 0.5−0.8 nm micropores in PSACs was found to be the rate-limiting step in urea−SCR reaction, which was confirmed by both the apparent activation energy calculations and the kinetics results of urea−SCR reaction and NO oxidation on PSAC. These two reactions gave very similar negative apparent activation energies (−16.5 kJ/mol for urea−SCR reaction and −15.2 kJ/mol for NO oxidation), indicating that the adsorption of reactants on PSAC is of key importance in these two reactions. Moreover, these two reactions were both approximately first-order with respect to NO and one-half order with respect to O2. It was found that NO3 from the disproportionation of the produced NO2 was quickly reduced by supported urea into N2. After the complete consumption of supported urea, NO2 started to release, and the carbon surface was gradually oxidized by adsorbed NOx species. NO3 was found to be stably adsorbed on the oxidized carbon surface. On the basis of the results obtained, a reaction mechanism of low-temperature urea-SCR reaction on PSAC was proposed and discussed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102506q [article] Kinetics and mechanism study of Low-temperature selective catalytic reduction of NO with urea supported on pitch-based spherical activated carbon [texte imprimé] / Zhi Wang, Auteur ; Yanli Wang, Auteur ; Donghui Long, Auteur . - 2011 . - pp. 6017–6027. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6017–6027 Mots-clés : Kinetics  Mechanism  Catalytic  reduction Résumé : The kinetics and mechanism of selective catalytic reduction (SCR) of NO with urea supported on pitch-based spherical activated carbons (PSACs) were studied at low temperatures. NO oxidation to NO2 catalyzed by the 0.5−0.8 nm micropores in PSACs was found to be the rate-limiting step in urea−SCR reaction, which was confirmed by both the apparent activation energy calculations and the kinetics results of urea−SCR reaction and NO oxidation on PSAC. These two reactions gave very similar negative apparent activation energies (−16.5 kJ/mol for urea−SCR reaction and −15.2 kJ/mol for NO oxidation), indicating that the adsorption of reactants on PSAC is of key importance in these two reactions. Moreover, these two reactions were both approximately first-order with respect to NO and one-half order with respect to O2. It was found that NO3 from the disproportionation of the produced NO2 was quickly reduced by supported urea into N2. After the complete consumption of supported urea, NO2 started to release, and the carbon surface was gradually oxidized by adsorbed NOx species. NO3 was found to be stably adsorbed on the oxidized carbon surface. On the basis of the results obtained, a reaction mechanism of low-temperature urea-SCR reaction on PSAC was proposed and discussed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102506q

Low - temperature selective catalytic reduction of NO with urea supported on pitch - based spherical activated carbon / Zhi Wang in Industrial & engineering chemistry research, Vol. 49 N° 14 (Juillet 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6317-6322 Titre : Low - temperature selective catalytic reduction of NO with urea supported on pitch - based spherical activated carbon Type de document : texte imprimé Auteurs : Zhi Wang, Auteur ; Yanli Wang, Auteur ; Dengjun Wang, Auteur Année de publication : 2010 Article en page(s) : pp. 6317-6322 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Activated  carbon  Selective  catalytic  reduction  Low  temperature Résumé : Urea as a reducing agent supported on pitch-based spherical activated carbon (PSAC) was studied for NO reduction at low temperatures (30−90 °C). The results showed that PSAC with 8 wt % urea loading exhibited high activity in the selective catalytic reduction (SCR) of NO at 30 °C. The SCR activity decreased markedly when urea loading was increased above 8 wt % due to pore plugging, which restricted the adsorption of gas phase reactants on PSAC, although the NOx removal period was extended. A low reaction temperature was favorable for NO reduction on account of the increased NO adsorption on PSAC. It was found that the SCR activity was improved by increasing NO or O2 concentration in the feed gas, owing to the enhanced NO oxidation by O2 to NO2, which was then reduced by urea to form N2. Increasing space velocity not only decreased the SCR activity but also shortened the NOx removal period. More than 85% NOx conversion for 55 h could be achieved over PSAC with 8 wt % urea loading at 30 °C under the conditions of 500 ppmv NO, 21 vol % O2, and a space velocity of 2000 h−1. Furthermore, PSAC showed a superior hydrodynamic property, and the pressure drop ratio of PSAC to a commercial granule activated carbon with the equivalent particle size was about 35% with the apparent air flow velocity in a range of 0.120.51 m/s. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23040385 [article] Low - temperature selective catalytic reduction of NO with urea supported on pitch - based spherical activated carbon [texte imprimé] / Zhi Wang, Auteur ; Yanli Wang, Auteur ; Dengjun Wang, Auteur . - 2010 . - pp. 6317-6322. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6317-6322 Mots-clés : Activated  carbon  Selective  catalytic  reduction  Low  temperature Résumé : Urea as a reducing agent supported on pitch-based spherical activated carbon (PSAC) was studied for NO reduction at low temperatures (30−90 °C). The results showed that PSAC with 8 wt % urea loading exhibited high activity in the selective catalytic reduction (SCR) of NO at 30 °C. The SCR activity decreased markedly when urea loading was increased above 8 wt % due to pore plugging, which restricted the adsorption of gas phase reactants on PSAC, although the NOx removal period was extended. A low reaction temperature was favorable for NO reduction on account of the increased NO adsorption on PSAC. It was found that the SCR activity was improved by increasing NO or O2 concentration in the feed gas, owing to the enhanced NO oxidation by O2 to NO2, which was then reduced by urea to form N2. Increasing space velocity not only decreased the SCR activity but also shortened the NOx removal period. More than 85% NOx conversion for 55 h could be achieved over PSAC with 8 wt % urea loading at 30 °C under the conditions of 500 ppmv NO, 21 vol % O2, and a space velocity of 2000 h−1. Furthermore, PSAC showed a superior hydrodynamic property, and the pressure drop ratio of PSAC to a commercial granule activated carbon with the equivalent particle size was about 35% with the apparent air flow velocity in a range of 0.120.51 m/s. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23040385

Parametric study of the membrane process for carbon dioxide removal from natural gas / Dongxiao Yang in Industrial & engineering chemistry research, Vol. 48 N° 19 (Octobre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 9013–9022 Titre : Parametric study of the membrane process for carbon dioxide removal from natural gas Type de document : texte imprimé Auteurs : Dongxiao Yang, Auteur ; Zhi Wang, Auteur ; Jixiao Wang, Auteur Année de publication : 2009 Article en page(s) : pp. 9013–9022 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Cross-flow  model  Removing  CO2Natural  gas Résumé : In this work, the cross-flow model is compared with the cocurrent flow model and the countercurrent flow model for the process of removing CO2 from natural gas. According to the comparison result, the cross-flow model is used for the analysis of the process of CO2 removal from the natural gas. Analysis results indicate that the membrane area is not a monodrome function of the selectivity and both the effects of the fast gas (CO2) permeability and the slow gas (CH4) permeability on membrane area and CH4 recovery are studied. Similar analysis is carried out for the operating pressures. Both the single stage system and the two-stage system with a recycle are studied. In order to reduce the membrane area required, membranes with high permeability and selectivity less than 100 are preferable. With increasing feed side pressure and decreasing permeate side pressure, the membrane area required decreases and the CH4 recovery increases. For the single-stage system using a commercial membrane with selectivity of 20, the CH4 recovery is lower than 90% at a product purity of 98%. Only when the membrane with selectivity higher than 50 is used, the separation of CH4 recovery >98% and product purity >98% target can be fulfilled by the single stage system. Using the two-stage system with a membrane selectivity of 20, the separation target can be achieved. In the two-stage system, the permeate gas of the first stage has to be compressed before it can be sent to the next stage. The compression energy required between stages is estimated to be 107.5 KJ/m3(STP) of feed for the process discussed in this paper. Even considering the conversion factor between heat and electricity of 3−4, the energy consumption of a two-stage membrane system is still much less than that of the amine absorption process which is about 600−900 KJ/(m3(STP) of feed). En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900028m [article] Parametric study of the membrane process for carbon dioxide removal from natural gas [texte imprimé] / Dongxiao Yang, Auteur ; Zhi Wang, Auteur ; Jixiao Wang, Auteur . - 2009 . - pp. 9013–9022. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 9013–9022 Mots-clés : Cross-flow  model  Removing  CO2Natural  gas Résumé : In this work, the cross-flow model is compared with the cocurrent flow model and the countercurrent flow model for the process of removing CO2 from natural gas. According to the comparison result, the cross-flow model is used for the analysis of the process of CO2 removal from the natural gas. Analysis results indicate that the membrane area is not a monodrome function of the selectivity and both the effects of the fast gas (CO2) permeability and the slow gas (CH4) permeability on membrane area and CH4 recovery are studied. Similar analysis is carried out for the operating pressures. Both the single stage system and the two-stage system with a recycle are studied. In order to reduce the membrane area required, membranes with high permeability and selectivity less than 100 are preferable. With increasing feed side pressure and decreasing permeate side pressure, the membrane area required decreases and the CH4 recovery increases. For the single-stage system using a commercial membrane with selectivity of 20, the CH4 recovery is lower than 90% at a product purity of 98%. Only when the membrane with selectivity higher than 50 is used, the separation of CH4 recovery >98% and product purity >98% target can be fulfilled by the single stage system. Using the two-stage system with a membrane selectivity of 20, the separation target can be achieved. In the two-stage system, the permeate gas of the first stage has to be compressed before it can be sent to the next stage. The compression energy required between stages is estimated to be 107.5 KJ/m3(STP) of feed for the process discussed in this paper. Even considering the conversion factor between heat and electricity of 3−4, the energy consumption of a two-stage membrane system is still much less than that of the amine absorption process which is about 600−900 KJ/(m3(STP) of feed). En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900028m

Performance improvement of polysulfone ultrafiltration membrane using well - dispersed polyaniline – poly (vinylpyrrolidone) nanocomposite as the additive / Song Zhao in Industrial & engineering chemistry research, Vol. 51 N° 12 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 12 (Mars 2012) . - pp. 4661–4672 Titre : Performance improvement of polysulfone ultrafiltration membrane using well - dispersed polyaniline – poly (vinylpyrrolidone) nanocomposite as the additive Type de document : texte imprimé Auteurs : Song Zhao, Auteur ; Zhi Wang, Auteur ; Xin Wei, Auteur Année de publication : 2012 Article en page(s) : pp. 4661–4672 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ultrafiltration  membrane  Nanocomposite Résumé : Well-dispersed polyaniline–poly(vinylpyrrolidone) (PANI–PVP) nanocomposite was synthesized through dispersion polymerization and then used as a novel additive to prepare a polysulfone (PSf)/PANI–PVP nanocomposite membrane via immersion precipitation process. During membrane formation, a portion of PVP acted as a pore-forming agent while another PANI–PVP nanocomposite, combined by hydrogen bonds between carbonyl groups of PVP and N-hydrogen groups of PANI, acted as a hydrophilic modification agent. The addition of PANI–PVP nanocomposite increased membrane surface pore size, porosity, and hydrophilicity. Pure water fluxes of PSf/PANI–PVP nanocomposite membranes were 1.8–3.5 times that of PSf membrane with a slight change of bovine serum albumin (BSA) rejection. The membrane antifouling property was examined by the cross-flow ultafiltration using BSA solution as the model system. The results of flux decline behavior and flux recovery ratio showed that PSf/PANI–PVP nanocomposite membranes had an excellent antifouling property. Compared with PSf/PVP membranes prepared using PVP as the additive, PSf/PANI–PVP nanocomposite membranes processed higher pure water flux and better hydrophilicity, antifouling property, and stability. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202503p [article] Performance improvement of polysulfone ultrafiltration membrane using well - dispersed polyaniline – poly (vinylpyrrolidone) nanocomposite as the additive [texte imprimé] / Song Zhao, Auteur ; Zhi Wang, Auteur ; Xin Wei, Auteur . - 2012 . - pp. 4661–4672. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 12 (Mars 2012) . - pp. 4661–4672 Mots-clés : Ultrafiltration  membrane  Nanocomposite Résumé : Well-dispersed polyaniline–poly(vinylpyrrolidone) (PANI–PVP) nanocomposite was synthesized through dispersion polymerization and then used as a novel additive to prepare a polysulfone (PSf)/PANI–PVP nanocomposite membrane via immersion precipitation process. During membrane formation, a portion of PVP acted as a pore-forming agent while another PANI–PVP nanocomposite, combined by hydrogen bonds between carbonyl groups of PVP and N-hydrogen groups of PANI, acted as a hydrophilic modification agent. The addition of PANI–PVP nanocomposite increased membrane surface pore size, porosity, and hydrophilicity. Pure water fluxes of PSf/PANI–PVP nanocomposite membranes were 1.8–3.5 times that of PSf membrane with a slight change of bovine serum albumin (BSA) rejection. The membrane antifouling property was examined by the cross-flow ultafiltration using BSA solution as the model system. The results of flux decline behavior and flux recovery ratio showed that PSf/PANI–PVP nanocomposite membranes had an excellent antifouling property. Compared with PSf/PVP membranes prepared using PVP as the additive, PSf/PANI–PVP nanocomposite membranes processed higher pure water flux and better hydrophilicity, antifouling property, and stability. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202503p

Role of pore structure of activated carbon fibers in the catalytic oxidation of H2S / Qingjun Chen in Industrial & engineering chemistry research, Vol. 49 N° 7 (Avril 2010) 

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