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Methanol to olefin over ca-modified HZSM-5 zeolites / Suhong Zhang in Industrial & engineering chemistry research, Vol. 49 N° 5 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2103–2106 Titre : Methanol to olefin over ca-modified HZSM-5 zeolites Type de document : texte imprimé Auteurs : Suhong Zhang, Auteur ; Bianling Zhang, Auteur ; Zhixian Gao, Auteur Année de publication : 2010 Article en page(s) : pp. 2103–2106 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Methanol  of  Olefin;  Zeolites  HZSM-5 Résumé : A series of HZSM-5 zeolites modified with various Ca loadings were prepared by an incipient impregnation technique and characterized by Fourier transform infrared spectra of adsorbed pyridine and temperature-programmed desorption of NH3 and CO2. Methanol to olefin (MTO) over Ca-modified HZSM-5 zeolites was performed in a flow-type fixed bed reactor. The results indicated that Ca modification increased both the catalytic stability and the light olefin selectivity. However, an excess Ca loading resulted in an inferior catalytic performance. Hence, there was an optimal Ca loading for a specific HZSM-5, and the thus prepared Ca/HZSM-5 had little free Brönsted acid sites and presented the best catalytic performance of MTO. A possible mechanism for MTO involving acid−base centers on Ca-modified HZSM-5 zeolites has been suggested on the basis of the results obtained. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901446m [article] Methanol to olefin over ca-modified HZSM-5 zeolites [texte imprimé] / Suhong Zhang, Auteur ; Bianling Zhang, Auteur ; Zhixian Gao, Auteur . - 2010 . - pp. 2103–2106. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2103–2106 Mots-clés : Methanol  of  Olefin;  Zeolites  HZSM-5 Résumé : A series of HZSM-5 zeolites modified with various Ca loadings were prepared by an incipient impregnation technique and characterized by Fourier transform infrared spectra of adsorbed pyridine and temperature-programmed desorption of NH3 and CO2. Methanol to olefin (MTO) over Ca-modified HZSM-5 zeolites was performed in a flow-type fixed bed reactor. The results indicated that Ca modification increased both the catalytic stability and the light olefin selectivity. However, an excess Ca loading resulted in an inferior catalytic performance. Hence, there was an optimal Ca loading for a specific HZSM-5, and the thus prepared Ca/HZSM-5 had little free Brönsted acid sites and presented the best catalytic performance of MTO. A possible mechanism for MTO involving acid−base centers on Ca-modified HZSM-5 zeolites has been suggested on the basis of the results obtained. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901446m