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Catalytic conversion of ethylene to propylene and butenes over H−ZSM-5 / Baomin Lin in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10788–10795 Titre : Catalytic conversion of ethylene to propylene and butenes over H−ZSM-5 Type de document : texte imprimé Auteurs : Baomin Lin, Auteur ; Qinghong Zhang, Auteur ; Ye Wang, Auteur Année de publication : 2010 Article en page(s) : pp. 10788–10795 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalytic--Conversion--Ethylene--Propylene--Butenes--H−ZSM-5 Résumé : Among 11 kinds of molecular sieves examined, H−ZSM-5 exhibited the highest activity for the direct conversion of ethylene to propylene. The conversion of ethylene was 58% and the selectivities to propylene and butenes were 42% and 21%, respectively, over H−ZSM-5 at 723 K. Our studies demonstrate that the conversion of ethylene increases with the degree of H+ exchange in the H−Na−ZSM-5 series of samples with different H+ exchange degrees and the Al content in the H−ZSM-5 samples with different Si/Al ratios. The strong Brønsted acid sites are proposed to account for the conversion of ethylene. The modification of H−ZSM-5 with phosphorus or boron could enhance the selectivity of propylene but decreased the conversion of ethylene due to the decreased acidity. In situ FT-IR studies confirm the reaction of ethylene molecules with the Brønsted acid sites associated with −Si−(OH)−Al− groups. In situ FT-IR results further suggest the occurrence of oligomerization of ethylene on the surface of H−ZSM-5. We speculate that the cracking of the oligomeric intermediates may lead to the formation of propylene. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901227p [article] Catalytic conversion of ethylene to propylene and butenes over H−ZSM-5 [texte imprimé] / Baomin Lin, Auteur ; Qinghong Zhang, Auteur ; Ye Wang, Auteur . - 2010 . - pp. 10788–10795. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10788–10795 Mots-clés : Catalytic--Conversion--Ethylene--Propylene--Butenes--H−ZSM-5 Résumé : Among 11 kinds of molecular sieves examined, H−ZSM-5 exhibited the highest activity for the direct conversion of ethylene to propylene. The conversion of ethylene was 58% and the selectivities to propylene and butenes were 42% and 21%, respectively, over H−ZSM-5 at 723 K. Our studies demonstrate that the conversion of ethylene increases with the degree of H+ exchange in the H−Na−ZSM-5 series of samples with different H+ exchange degrees and the Al content in the H−ZSM-5 samples with different Si/Al ratios. The strong Brønsted acid sites are proposed to account for the conversion of ethylene. The modification of H−ZSM-5 with phosphorus or boron could enhance the selectivity of propylene but decreased the conversion of ethylene due to the decreased acidity. In situ FT-IR studies confirm the reaction of ethylene molecules with the Brønsted acid sites associated with −Si−(OH)−Al− groups. In situ FT-IR results further suggest the occurrence of oligomerization of ethylene on the surface of H−ZSM-5. We speculate that the cracking of the oligomeric intermediates may lead to the formation of propylene. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901227p

Catalytic conversion of ethylene to propylene and butenes over H−ZSM-5 / Baomin Lin in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10788–10795 Titre : Catalytic conversion of ethylene to propylene and butenes over H−ZSM-5 Type de document : texte imprimé Auteurs : Baomin Lin, Auteur ; Qinghong Zhang, Auteur ; Ye Wang, Auteur Année de publication : 2010 Article en page(s) : pp. 10788–10795 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Ethylene  Propylene  Butenes  Catalytic  conversion Résumé : Among 11 kinds of molecular sieves examined, H−ZSM-5 exhibited the highest activity for the direct conversion of ethylene to propylene. The conversion of ethylene was 58% and the selectivities to propylene and butenes were 42% and 21%, respectively, over H−ZSM-5 at 723 K. Our studies demonstrate that the conversion of ethylene increases with the degree of H+ exchange in the H−Na−ZSM-5 series of samples with different H+ exchange degrees and the Al content in the H−ZSM-5 samples with different Si/Al ratios. The strong Brønsted acid sites are proposed to account for the conversion of ethylene. The modification of H−ZSM-5 with phosphorus or boron could enhance the selectivity of propylene but decreased the conversion of ethylene due to the decreased acidity. In situ FT-IR studies confirm the reaction of ethylene molecules with the Brønsted acid sites associated with −Si−(OH)−Al− groups. In situ FT-IR results further suggest the occurrence of oligomerization of ethylene on the surface of H−ZSM-5. We speculate that the cracking of the oligomeric intermediates may lead to the formation of propylene. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901227p [article] Catalytic conversion of ethylene to propylene and butenes over H−ZSM-5 [texte imprimé] / Baomin Lin, Auteur ; Qinghong Zhang, Auteur ; Ye Wang, Auteur . - 2010 . - pp. 10788–10795. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10788–10795 Mots-clés : Ethylene  Propylene  Butenes  Catalytic  conversion Résumé : Among 11 kinds of molecular sieves examined, H−ZSM-5 exhibited the highest activity for the direct conversion of ethylene to propylene. The conversion of ethylene was 58% and the selectivities to propylene and butenes were 42% and 21%, respectively, over H−ZSM-5 at 723 K. Our studies demonstrate that the conversion of ethylene increases with the degree of H+ exchange in the H−Na−ZSM-5 series of samples with different H+ exchange degrees and the Al content in the H−ZSM-5 samples with different Si/Al ratios. The strong Brønsted acid sites are proposed to account for the conversion of ethylene. The modification of H−ZSM-5 with phosphorus or boron could enhance the selectivity of propylene but decreased the conversion of ethylene due to the decreased acidity. In situ FT-IR studies confirm the reaction of ethylene molecules with the Brønsted acid sites associated with −Si−(OH)−Al− groups. In situ FT-IR results further suggest the occurrence of oligomerization of ethylene on the surface of H−ZSM-5. We speculate that the cracking of the oligomeric intermediates may lead to the formation of propylene. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901227p