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Catalytic cracking of 2,2,4-trimethylpentane on FAU, MFI, and bimodal porous materials: influence of acid properties and pore topology / Rhona Van Borm in Industrial & engineering chemistry research, Vol. 49 N° 15 (Août 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 6815–6823 Titre : Catalytic cracking of 2,2,4-trimethylpentane on FAU, MFI, and bimodal porous materials: influence of acid properties and pore topology Type de document : texte imprimé Auteurs : Rhona Van Borm, Auteur ; Alexander Aerts, Auteur ; Marie-Françoise Reyniers, Auteur Année de publication : 2010 Article en page(s) : pp 6815–6823 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalytic  Bimodal  porous  materials. Résumé : Cracking experiments using 2,2,4-trimethylpentane as a model component have been performed on five FAU and three MFI zeolites. In addition to these eight commercially available catalysts, two newly developed zeotype materials with bimodal pore structure, BIPOMs, have been investigated. Both BIPOMs possess an MFI ultramicropore (<1 nm) network but a different ordered supermicropore (1.5−2.0 nm) network. Site time yields are lower on MFI than on FAU because of the slower diffusion of the reactant inside the pores. The site time yield obtained on the BIPOMs is comparable to commercial MFI with similar Al content. Within one framework type, the zeolite acid properties determine its activity in catalytic cracking of 2,2,4-trimethylpentane, while the framework topology controls its selectivity. The main reaction route on FAU is hydride transfer followed by β-scission leading to mainly C4 species, while on MFI protolytic scission is responsible for the formation of high amounts of C1−C3 species. This points to the presence of transition state shape selectivity in MFI. These features allow to distinguish between FAU and MFI type catalytic behavior and to locate the active sites of BIPOM1 in the supermicropores and those of BIPOM3 in both micropore networks. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901708m [article] Catalytic cracking of 2,2,4-trimethylpentane on FAU, MFI, and bimodal porous materials: influence of acid properties and pore topology [texte imprimé] / Rhona Van Borm, Auteur ; Alexander Aerts, Auteur ; Marie-Françoise Reyniers, Auteur . - 2010 . - pp 6815–6823. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 6815–6823 Mots-clés : Catalytic  Bimodal  porous  materials. Résumé : Cracking experiments using 2,2,4-trimethylpentane as a model component have been performed on five FAU and three MFI zeolites. In addition to these eight commercially available catalysts, two newly developed zeotype materials with bimodal pore structure, BIPOMs, have been investigated. Both BIPOMs possess an MFI ultramicropore (<1 nm) network but a different ordered supermicropore (1.5−2.0 nm) network. Site time yields are lower on MFI than on FAU because of the slower diffusion of the reactant inside the pores. The site time yield obtained on the BIPOMs is comparable to commercial MFI with similar Al content. Within one framework type, the zeolite acid properties determine its activity in catalytic cracking of 2,2,4-trimethylpentane, while the framework topology controls its selectivity. The main reaction route on FAU is hydride transfer followed by β-scission leading to mainly C4 species, while on MFI protolytic scission is responsible for the formation of high amounts of C1−C3 species. This points to the presence of transition state shape selectivity in MFI. These features allow to distinguish between FAU and MFI type catalytic behavior and to locate the active sites of BIPOM1 in the supermicropores and those of BIPOM3 in both micropore networks. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901708m