Pt/H-ZSM-22 hydroisomerization catalysts optimization guided by Single-Event MicroKinetic modeling

[Display omitted] ► Zeolite shape selectivity can be exploited to boost hydroisomerization yields by 10%. ► Contribution analyses guide development of improved ZSM-22 crystals. ► Gentle synthesis template removal avoids crystal restructuring and acidity variations. A Single-Event MicroKinetic (SEMK)...

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Vydáno v:	Journal of catalysis Ročník 290; s. 165 - 176
Hlavní autoři:	Choudhury, Indranil R., Hayasaka, Kazuaki, Thybaut, Joris W., Laxmi Narasimhan, C.S., Denayer, Joeri F., Martens, Johan A., Marin, Guy B.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Amsterdam Elsevier Inc 01.06.2012 Elsevier Elsevier BV
Témata:	1,6-hexanediamine acidity Acids Catalysis Catalysts cation exchange Chemistry Colloidal state and disperse state crystallization Crystals decane enthalpy Exact sciences and technology General and physical chemistry Hydroisomerization Ion-exchange isomerization Kinetics micropores Porous materials Rational catalyst design Shape selectivity Single-Event MicroKinetics Surface physical chemistry Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry zeolites Zeolites: preparations and properties Hydroisomerization Shape selectivity Rational catalyst design Single-Event MicroKinetics Shape Micropore Enthalpy Acidic site Selectivity Porous material Modeling Physisorption Molecular sieve Optimization Template Design Cation exchange Isomerization Crystallization Acidity Zeolite Strong acid Heterogeneous catalysis Decane Microporosity Protonation Models Thermodynamic properties Catalyst
ISSN:	0021-9517, 1090-2694
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Shrnutí:	[Display omitted] ► Zeolite shape selectivity can be exploited to boost hydroisomerization yields by 10%. ► Contribution analyses guide development of improved ZSM-22 crystals. ► Gentle synthesis template removal avoids crystal restructuring and acidity variations. A Single-Event MicroKinetic (SEMK) model for hydroconversion of decane over bifunctional Pt/H-ZSM-22 zeolite catalysts is constructed. A distinction is made between acid sites at micropore mouths, inside micropores, and at bridges between micropore mouths. The catalyst descriptors used for the SEMK model are as follows: the concentrations of the acid sites and the corresponding physisorption and protonation enthalpies of the reacting molecules. The SEMK model indicates that the hydroisomerization yield can be enhanced by elimination of strong acid sites from the micropores. The acid strength of the investigated catalyst was found to be dependent on the way the 1,6-diaminohexane template used in the crystallization is removed. ZSM-22 samples with strongest acidity were obtained via calcination at 823K followed by ammonium exchange. Weaker acidity was obtained according to the SEMK model when the template was removed via cation exchange against ammonium. The resulting Pt/H-ZSM-22 catalyst exhibited a 10% higher maximum isomerization yield.
Bibliografie:	http://dx.doi.org/10.1016/j.jcat.2012.03.015 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-1 ObjectType-Feature-2 content type line 23
ISSN:	0021-9517 1090-2694
DOI:	10.1016/j.jcat.2012.03.015