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Reactions of indan over zeolite catalysts / Xiaojing Cheng in Industrial & engineering chemistry research, Vol. 49 N° 20 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9759–9763 Titre : Reactions of indan over zeolite catalysts Type de document : texte imprimé Auteurs : Xiaojing Cheng, Auteur ; Guang Xiong, Auteur ; Xinwen Guo, Auteur Année de publication : 2011 Article en page(s) : pp. 9759–9763 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Zeolite  Catalysts Résumé : The reactions of indan were studied over ZSM-5, zeolite β, and mordenite under atmospheric pressure or 3 MPa. Zeolite β shows the best catalytic activity. The main reaction pathways of indan are five-membered ring opening and condensation. The ring-opening reaction of indan follows β scission mechanism. No hydrogenation of indan occurs. When the reaction temperature or the concentration of indan is high, it tends to condensate to form polyaromatics. No effect of aromatics such as benzene or trimethylbenzene was found in the reactions of indan. The existence of indan decreases the conversion of trimethylbenzene because of its preferential adsorption on the catalysts. The amount of indan in the reactant strongly affects the coke amount of the catalyst. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1012085 [article] Reactions of indan over zeolite catalysts [texte imprimé] / Xiaojing Cheng, Auteur ; Guang Xiong, Auteur ; Xinwen Guo, Auteur . - 2011 . - pp. 9759–9763. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9759–9763 Mots-clés : Zeolite  Catalysts Résumé : The reactions of indan were studied over ZSM-5, zeolite β, and mordenite under atmospheric pressure or 3 MPa. Zeolite β shows the best catalytic activity. The main reaction pathways of indan are five-membered ring opening and condensation. The ring-opening reaction of indan follows β scission mechanism. No hydrogenation of indan occurs. When the reaction temperature or the concentration of indan is high, it tends to condensate to form polyaromatics. No effect of aromatics such as benzene or trimethylbenzene was found in the reactions of indan. The existence of indan decreases the conversion of trimethylbenzene because of its preferential adsorption on the catalysts. The amount of indan in the reactant strongly affects the coke amount of the catalyst. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1012085

Role of acidity in the ethylation of coking benzene with ethanol over nanosized HZSM-5 / Sun, Linping in Industrial & engineering chemistry research, Vol. 49 N° 2 (Janvier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 506–514 Titre : Role of acidity in the ethylation of coking benzene with ethanol over nanosized HZSM-5 Type de document : texte imprimé Auteurs : Sun, Linping, Auteur ; Xinwen Guo, Auteur ; Liu, Min, Auteur Année de publication : 2010 Article en page(s) : pp 506–514 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ethylation  Zeolites  Thermogravimetry  Dimethylpyridine. Résumé : Ethylation of coking benzene, the product of coke oven gas, with ethanol over nanosized HZSM-5 zeolites poisoned by 2,6-dimethylpyridine has been investigated in a fixed-bed reactor. Pyridine infrared (Py-IR), amonia temperature programmed desorption (NH3-TPD), thermogravimetry (TG), acidity titration with a Hammett indicator, and cyclohexane and n-hexane adsorption were used to characterize the changes in acidity and porosity of the nanosized HZSM-5 zeolites poisoned by 2,6-dimethylpyridine. Conversion and product distribution depend strongly on the degree of catalyst poisoning. The acidity−activity correlation indicates that acid sites with pKa < −3.0 are responsible for the ethylation of coking benzene and sites with pKa < 2.27 are responsibly for the thiophene conversion. The remaining acid sites, which are not active for the ethylation of coking benzene over the poisoned sample, act as active centers for ethanol dehydration to ethylene. 2,6-Dimethylpyridine not only adsorbs on the strong Brnsted acid sites but blocks the zeolite channels over the poisoned sample. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901218j [article] Role of acidity in the ethylation of coking benzene with ethanol over nanosized HZSM-5 [texte imprimé] / Sun, Linping, Auteur ; Xinwen Guo, Auteur ; Liu, Min, Auteur . - 2010 . - pp 506–514. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 506–514 Mots-clés : Ethylation  Zeolites  Thermogravimetry  Dimethylpyridine. Résumé : Ethylation of coking benzene, the product of coke oven gas, with ethanol over nanosized HZSM-5 zeolites poisoned by 2,6-dimethylpyridine has been investigated in a fixed-bed reactor. Pyridine infrared (Py-IR), amonia temperature programmed desorption (NH3-TPD), thermogravimetry (TG), acidity titration with a Hammett indicator, and cyclohexane and n-hexane adsorption were used to characterize the changes in acidity and porosity of the nanosized HZSM-5 zeolites poisoned by 2,6-dimethylpyridine. Conversion and product distribution depend strongly on the degree of catalyst poisoning. The acidity−activity correlation indicates that acid sites with pKa < −3.0 are responsible for the ethylation of coking benzene and sites with pKa < 2.27 are responsibly for the thiophene conversion. The remaining acid sites, which are not active for the ethylation of coking benzene over the poisoned sample, act as active centers for ethanol dehydration to ethylene. 2,6-Dimethylpyridine not only adsorbs on the strong Brnsted acid sites but blocks the zeolite channels over the poisoned sample. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901218j

SO3H-functionalized ionic liquids for selective alkylation of p-cresol with tert-butanol / Xiumei Liu in Industrial & engineering chemistry research, Vol. 47 n°15 (Août 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5298–5303 Titre : SO3H-functionalized ionic liquids for selective alkylation of p-cresol with tert-butanol Type de document : texte imprimé Auteurs : Xiumei Liu, Auteur ; Jinxia Zhou, Auteur ; Xinwen Guo, Auteur ; Liu, Min, Auteur Année de publication : 2008 Article en page(s) : p. 5298–5303 Note générale : Bibliogr. p. 5303 Langues : Anglais (eng) Mots-clés : SO3H  --  ionic  liquids;  Hammett  method;  p-cresol  conversion;  tert-Butanol Résumé : The SO3H-functionalized ionic liquids were synthesized by using pyridine and 1,4-butane or 1,3-propane sulfone as the source and characterized by NMR and time-of-flight mass spectrometry. The acidity of the ionic liquids determined by the Hammett method is almost the same as that of a conventional acid, such as H2SO4. The catalytic performance of ionic liquids for the tert-butylation of p-cresol with tert-butanol was evaluated; by using the ionic liquids as catalysts at the optimum reaction conditions, 79% of the p-cresol conversion and 92% of the selectivity to 2-tert-butyl-p-cresol can be obtained. The spent ionic liquid can be recovered and recycled. The possible mechanism for this reaction system was discussed based on the reaction results and the ab initio calculation results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie070647t [article] SO3H-functionalized ionic liquids for selective alkylation of p-cresol with tert-butanol [texte imprimé] / Xiumei Liu, Auteur ; Jinxia Zhou, Auteur ; Xinwen Guo, Auteur ; Liu, Min, Auteur . - 2008 . - p. 5298–5303. Bibliogr. p. 5303 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5298–5303 Mots-clés : SO3H  --  ionic  liquids;  Hammett  method;  p-cresol  conversion;  tert-Butanol Résumé : The SO3H-functionalized ionic liquids were synthesized by using pyridine and 1,4-butane or 1,3-propane sulfone as the source and characterized by NMR and time-of-flight mass spectrometry. The acidity of the ionic liquids determined by the Hammett method is almost the same as that of a conventional acid, such as H2SO4. The catalytic performance of ionic liquids for the tert-butylation of p-cresol with tert-butanol was evaluated; by using the ionic liquids as catalysts at the optimum reaction conditions, 79% of the p-cresol conversion and 92% of the selectivity to 2-tert-butyl-p-cresol can be obtained. The spent ionic liquid can be recovered and recycled. The possible mechanism for this reaction system was discussed based on the reaction results and the ab initio calculation results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie070647t

Synthesis of titanium silicalite-1 with small crystal size by using mother liquid of titanium silicalite-1 As seed / Yi Zuo 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. 8485-8491 Titre : Synthesis of titanium silicalite-1 with small crystal size by using mother liquid of titanium silicalite-1 As seed Type de document : texte imprimé Auteurs : Yi Zuo, Auteur ; Xiangsheng Wang, Auteur ; Xinwen Guo, Auteur Année de publication : 2011 Article en page(s) : pp. 8485-8491 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Titanium  Silicalite Résumé : Titanium silicalite-1 (TS-1) with small crystal size was synthesized in a TPABr-ethylamine system using the mother liquid of nanosized TS-1 as seed. The as-synthesized small-crystal TS-1, the size of which was about 600 nm × 400 nm x 250 nm was characterized with X-ray diffraction (XRD), Fourier transform-infrared (FT-IR), ultraviolet-visible (UV―vis), UV-Raman, N2 sorption, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Its catalytic performance was evaluated in the epoxidation of propylene and the hydroxylation of phenol. The conversion of hydrogen peroxide and selectivity of propylene oxide (PO) in the propylene epoxidation reached 92 and 98 mol %, respectively. In the hydroxylation of phenol, small-crystal TS-1 also resulted in a high conversion of phenol. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346888 [article] Synthesis of titanium silicalite-1 with small crystal size by using mother liquid of titanium silicalite-1 As seed [texte imprimé] / Yi Zuo, Auteur ; Xiangsheng Wang, Auteur ; Xinwen Guo, Auteur . - 2011 . - pp. 8485-8491. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8485-8491 Mots-clés : Titanium  Silicalite Résumé : Titanium silicalite-1 (TS-1) with small crystal size was synthesized in a TPABr-ethylamine system using the mother liquid of nanosized TS-1 as seed. The as-synthesized small-crystal TS-1, the size of which was about 600 nm × 400 nm x 250 nm was characterized with X-ray diffraction (XRD), Fourier transform-infrared (FT-IR), ultraviolet-visible (UV―vis), UV-Raman, N2 sorption, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Its catalytic performance was evaluated in the epoxidation of propylene and the hydroxylation of phenol. The conversion of hydrogen peroxide and selectivity of propylene oxide (PO) in the propylene epoxidation reached 92 and 98 mol %, respectively. In the hydroxylation of phenol, small-crystal TS-1 also resulted in a high conversion of phenol. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346888