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Dimethyl ether synthesis from CO2 hydrogenation on a CuO-ZnO-Al2O3-ZrO2/HZSM-5 bifunctional catalyst / Xin An in Industrial & engineering chemistry research, Vol. 47 N°17 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6547–6554 Titre : Dimethyl ether synthesis from CO2 hydrogenation on a CuO-ZnO-Al2O3-ZrO2/HZSM-5 bifunctional catalyst Type de document : texte imprimé Auteurs : Xin An, Auteur ; Yi-Zan Zuo, Auteur ; Qiang Zhang, Auteur Année de publication : 2008 Article en page(s) : p. 6547–6554 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Dimethy  ether  synthesis  CO2  hydrogenation  Bifunctional  catalyst Résumé : A CuO−ZnO−Al2O3−ZrO2 + HZSM-5 physical mixture bifunctional catalyst with a high activity for dimethy ether (DME) synthesis was used for CO2 hydrogenation. Various factors that affect catalyst activity, including the reaction temperature, pressure, and space velocity, were investigated. CO2 conversion reached 0.309, and DME and methanol yields were 0.212 and 0.059 with a stoichiometric ratio of H2 to CO2 of 3 at 523 K, 5 MPa, and a space velocity of 6000 mL/(g cat·h). Well-studied kinetic models for methanol synthesis and methanol dehydration, respectively, were used to fit the experimental data and the kinetic parameters in the rate equations for DME synthesis were obtained by regression. A simulated process for CO2 hydrogenation indicated that a higher DME yield can be obtained with CO recycle that will also give a CO-free product. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800777t [article] Dimethyl ether synthesis from CO2 hydrogenation on a CuO-ZnO-Al2O3-ZrO2/HZSM-5 bifunctional catalyst [texte imprimé] / Xin An, Auteur ; Yi-Zan Zuo, Auteur ; Qiang Zhang, Auteur . - 2008 . - p. 6547–6554. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6547–6554 Mots-clés : Dimethy  ether  synthesis  CO2  hydrogenation  Bifunctional  catalyst Résumé : A CuO−ZnO−Al2O3−ZrO2 + HZSM-5 physical mixture bifunctional catalyst with a high activity for dimethy ether (DME) synthesis was used for CO2 hydrogenation. Various factors that affect catalyst activity, including the reaction temperature, pressure, and space velocity, were investigated. CO2 conversion reached 0.309, and DME and methanol yields were 0.212 and 0.059 with a stoichiometric ratio of H2 to CO2 of 3 at 523 K, 5 MPa, and a space velocity of 6000 mL/(g cat·h). Well-studied kinetic models for methanol synthesis and methanol dehydration, respectively, were used to fit the experimental data and the kinetic parameters in the rate equations for DME synthesis were obtained by regression. A simulated process for CO2 hydrogenation indicated that a higher DME yield can be obtained with CO recycle that will also give a CO-free product. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800777t

Does investor sentiment and stock return affect each other / Qiang Zhang in International journal of management science and engineering management, Vol. 5 N° 5 (Octobre 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 5 (Octobre 2010) . - pp.334-340 Titre : Does investor sentiment and stock return affect each other : (S)VAR model approach Type de document : texte imprimé Auteurs : Qiang Zhang, Auteur ; Mingmao Deng, Auteur ; Shue Yang, Auteur Année de publication : 2011 Article en page(s) : pp.334-340 Note générale : Management Langues : Anglais (eng) Mots-clés : Behavioral  finance  Investor's  sentiment  Stock  returns  (s)  VAR  model. Résumé : According to behavioral finance theory, investors' irrational behavior and psychology are crucial factors that influence stock prices on limited arbitrage stock market. Relevant attempts have been made to examine the impact of investors' sentiment on stock prices. But most studies focus on the predictability of investors' sentiment which is measured by direct or indirect index. And no results answer whether investors' sentiment is irrational. Nor do they tell how investors' sentiment influences the stock prices. This paper examines the multi-relationship between investors' sentiment, which is measured by the growth rate of investor accounts, and stock returns by the (S)VAR model. The results show that investors' sentiment is influenced by the previous performance of the stock market, which verifies the irrationality of investors' sentiment. The results also show that investor's sentiment has important influence on the contemporaneous and future stock returns. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?150.html [article] Does investor sentiment and stock return affect each other : (S)VAR model approach [texte imprimé] / Qiang Zhang, Auteur ; Mingmao Deng, Auteur ; Shue Yang, Auteur . - 2011 . - pp.334-340. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 5 (Octobre 2010) . - pp.334-340 Mots-clés : Behavioral  finance  Investor's  sentiment  Stock  returns  (s)  VAR  model. Résumé : According to behavioral finance theory, investors' irrational behavior and psychology are crucial factors that influence stock prices on limited arbitrage stock market. Relevant attempts have been made to examine the impact of investors' sentiment on stock prices. But most studies focus on the predictability of investors' sentiment which is measured by direct or indirect index. And no results answer whether investors' sentiment is irrational. Nor do they tell how investors' sentiment influences the stock prices. This paper examines the multi-relationship between investors' sentiment, which is measured by the growth rate of investor accounts, and stock returns by the (S)VAR model. The results show that investors' sentiment is influenced by the previous performance of the stock market, which verifies the irrationality of investors' sentiment. The results also show that investor's sentiment has important influence on the contemporaneous and future stock returns. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?150.html

Studies on the regeneration mechanism of Mg-Al-Ce-Fe mixed spinel De-SOx additives / Wen-Hui Yang 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. 13085-13091 Titre : Studies on the regeneration mechanism of Mg-Al-Ce-Fe mixed spinel De-SOx additives Type de document : texte imprimé Auteurs : Wen-Hui Yang, Auteur ; Qiang Zhang, Auteur ; Chun-Yi Li, Auteur Année de publication : 2012 Article en page(s) : pp. 13085-13091 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Additive Résumé : The regeneration mechanism of sulfur species formed on the Mg-Al-Ce-Fe mixed-spinel sulfur-transfer additives is clarified in this paper. Sulfate is the main sulfur species on the sulfur-transfer catalysts after the oxidative adsorption of SO2, and the S―O bond within sulfates shows lower stability in spinel phase than in the MgO phase. The reduction of these sulfate species leads to the emission of SO2 as well as H2S, and the formation of the two reductive products are both correlated with the change in Mg/Al ratio; however, SO2 is much more sensitive. When the regeneration was conducted at 550 °C, only H2S was observed as a reductive product; yet, at 700 °C, the small amount of H2S was preceded by a large amount of SO2. The mechanism for the sulfate reductive decomposition has been proposed that sulfite is the intermediate, which can be pyrolyzed into SO2 or undergo redox reaction to form H2S. The pyrolysis reaction is closely related to the relative magnitudes of the energy provided and required to break the S―O bond in sulfates, while the probability of the redox reaction is more likely to be dependent on the H2 concentration. Sulfur-transfer additives with more surface-active sites should be developed to enhance the reductive ability, since more time is needed for the bulk-like sulfate to be reduced. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26451457 [article] Studies on the regeneration mechanism of Mg-Al-Ce-Fe mixed spinel De-SOx additives [texte imprimé] / Wen-Hui Yang, Auteur ; Qiang Zhang, Auteur ; Chun-Yi Li, Auteur . - 2012 . - pp. 13085-13091. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 40 (Octobre 2012) . - pp. 13085-13091 Mots-clés : Additive Résumé : The regeneration mechanism of sulfur species formed on the Mg-Al-Ce-Fe mixed-spinel sulfur-transfer additives is clarified in this paper. Sulfate is the main sulfur species on the sulfur-transfer catalysts after the oxidative adsorption of SO2, and the S―O bond within sulfates shows lower stability in spinel phase than in the MgO phase. The reduction of these sulfate species leads to the emission of SO2 as well as H2S, and the formation of the two reductive products are both correlated with the change in Mg/Al ratio; however, SO2 is much more sensitive. When the regeneration was conducted at 550 °C, only H2S was observed as a reductive product; yet, at 700 °C, the small amount of H2S was preceded by a large amount of SO2. The mechanism for the sulfate reductive decomposition has been proposed that sulfite is the intermediate, which can be pyrolyzed into SO2 or undergo redox reaction to form H2S. The pyrolysis reaction is closely related to the relative magnitudes of the energy provided and required to break the S―O bond in sulfates, while the probability of the redox reaction is more likely to be dependent on the H2 concentration. Sulfur-transfer additives with more surface-active sites should be developed to enhance the reductive ability, since more time is needed for the bulk-like sulfate to be reduced. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26451457

Synthesis of CO2 - philic polysiloxane with N - halamine side groups for biocidal coating on cotton / Chen, Yong in Industrial & engineering chemistry research, Vol. 51 N° 27 (Juillet 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 27 (Juillet 2012) . - pp. 9260-9265 Titre : Synthesis of CO2 - philic polysiloxane with N - halamine side groups for biocidal coating on cotton Type de document : texte imprimé Auteurs : Chen, Yong, Auteur ; Xu-shi Zhong, Auteur ; Qiang Zhang, Auteur Année de publication : 2012 Article en page(s) : pp. 9260-9265 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Carbon  dioxide Résumé : A CO2-philic antibacterial precursor was synthesized through hydrosilylation reaction of poly(methylhydrosiloxane) (PMHS) and tert-butyl acrylate in the presence of platinum-based catalyst. Carboxyl groups were then generated by hydrolyzing the precursor with trifluoroacetic acid to bond tert-butylamine molecules via amide bonds that were further chlorinated to N-halamines with tert-butyl hypochlorite. The resultant N-halamine polysiloxane was coated on cotton by adsorption from supercritical CO2 (scCO2) to confer biocidal ability. This coating procedure provides an efficient way to attach antibacterial polymers onto substrates without using covalent bonds which limit the structure designs. Presented data showed that the antibacterial layer was stable toward washing and abrasion and provided potent biocidal activities against Staphylococcus aureus and Escherichia coli. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26132262 [article] Synthesis of CO2 - philic polysiloxane with N - halamine side groups for biocidal coating on cotton [texte imprimé] / Chen, Yong, Auteur ; Xu-shi Zhong, Auteur ; Qiang Zhang, Auteur . - 2012 . - pp. 9260-9265. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 27 (Juillet 2012) . - pp. 9260-9265 Mots-clés : Carbon  dioxide Résumé : A CO2-philic antibacterial precursor was synthesized through hydrosilylation reaction of poly(methylhydrosiloxane) (PMHS) and tert-butyl acrylate in the presence of platinum-based catalyst. Carboxyl groups were then generated by hydrolyzing the precursor with trifluoroacetic acid to bond tert-butylamine molecules via amide bonds that were further chlorinated to N-halamines with tert-butyl hypochlorite. The resultant N-halamine polysiloxane was coated on cotton by adsorption from supercritical CO2 (scCO2) to confer biocidal ability. This coating procedure provides an efficient way to attach antibacterial polymers onto substrates without using covalent bonds which limit the structure designs. Presented data showed that the antibacterial layer was stable toward washing and abrasion and provided potent biocidal activities against Staphylococcus aureus and Escherichia coli. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26132262