High-pressure liquid phase hydroconversion of heptane/nonane mixtures on Pt/H-Y zeolite catalyst

The competitive hydroconversion of heptane and nonane molecules in their mixture was studied in a continuous flow, fixed-bed reactor filled with Pt/HY zeolite catalyst. Liquid-phase reaction conditions were established at reaction temperatures of 230, 250, and 270 °C by pressurizing the reactor at 1...

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Vydáno v:Journal of catalysis Ročník 220; číslo 1; s. 66 - 73
Hlavní autoři: Denayer, Joeri F.M., Ocakoglu, Refik A., Huybrechts, Ward, Dejonckheere, Bruno, Jacobs, Pierre, Calero, Sofia, Krishna, Rajamani, Smit, Berend, Baron, Gino V., Martens, Johan A.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Amsterdam Elsevier Inc 15.11.2003
Elsevier
Témata:
Alkane mixtures
Catalysis
Catalytic reactions
CBMC simulation
Chemistry
Exact sciences and technology
General and physical chemistry
High pressure
Hydrocracking
Liquid phase
Molecular competition
Pt/HY zeolite
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Hydrocracking
Pt/HY zeolite
Molecular competition
Liquid phase
CBMC simulation
Alkane mixtures
High pressure
Monte Carlo method
Nonane
Catalytic reaction
Hydrocarbon
Transition metal
Zeolite
Heptane
Modeling
Supported catalyst
Molecular sieve
Heterogeneous catalysis
Binary mixture
Pressure effect
Partial pressure
Platinum
Alkane
ISSN:0021-9517, 1090-2694
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Popis
Shrnutí:The competitive hydroconversion of heptane and nonane molecules in their mixture was studied in a continuous flow, fixed-bed reactor filled with Pt/HY zeolite catalyst. Liquid-phase reaction conditions were established at reaction temperatures of 230, 250, and 270 °C by pressurizing the reactor at 100 bar. Hydrogen was supplied in an absorbed state with the liquid hydrocarbon feed. Under these liquid-phase reaction conditions, the apparent reaction rates of heptane and nonane were almost identical. In a similar experiment under vapor-phase conditions, nonane was much more reactive than heptane. The conversion data under liquid-phase conditions were analyzed with an adsorption-reaction model based on intrinsic kinetic parameters obtained from vapor-phase experiments. The model revealed that the enhanced reactivity of heptane in the liquid phase was due to its preferential adsorption. Simulation of the adsorption of the heptane/nonane mixture in the pores of zeolite Y with the configurational-bias Monte Carlo method confirmed the preferential adsorption of heptane in zeolite Y at high pressure. Under such conditions, in zeolite Y supercages the packing of the smaller heptane molecules is more favorable than that of the larger nonane molecules.
ISSN:0021-9517
1090-2694
DOI:10.1016/S0021-9517(03)00239-2