Mixture effects in alkane/cycloalkane hydroconversion over Pt/HUSY: Carbon number impact

Mixture effects in alkane/cycloalkane hydroconversion over Pt/HUSY: Carbon number impact

[Display omitted] •n-Alkane hydrocracking is more negatively impacted with admixture of heavier cycloalkanes.•Cycloalkane adsorbs on metal sites more favorably than n-alkane with higher carbon number.•Larger alkanes impact cycloalkanes conversion only by preferred physisorption. Cycloalkanes are kno...

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Bibliographic Details
Published in:Fuel (Guildford) Vol. 318; p. 123651
Main Authors: Korica, Nebojsa, Ben Hassine, Arij, Dao Thi, Hang, Bergaoui, Latifa, Van Geem, Kevin M., Mendes, Pedro S.F., De Clercq, Jeriffa, Thybaut, Joris W.
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 15-06-2022
Elsevier BV
Subjects:
Admixtures
Adsorption
Alkanes
Carbon
Carbon cycle
Carbon number impact
Catalysts
Conversion
Cycloalkanes
Dehydrogenation
Hydrocracking
Isomers
Methylcyclohexane
Physisorption
Protonation
Zeolites
Protonation
Carbon number impact
Hydrocracking
Dehydrogenation
Physisorption
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Summary:[Display omitted] •n-Alkane hydrocracking is more negatively impacted with admixture of heavier cycloalkanes.•Cycloalkane adsorbs on metal sites more favorably than n-alkane with higher carbon number.•Larger alkanes impact cycloalkanes conversion only by preferred physisorption. Cycloalkanes are known to impact the metal–acid balance of the hydrocracking of n-alkanes with similar carbon number, however, how this impact varies with the carbon number of the components involved is still to be understood in more detail. For this purpose, the hydroconversion of n-octane and tert-butylcyclohexane, and n-decane and methylcyclohexane mixtures was investigated in this work over Pt/HUSY catalyst in both the ideal and the nonideal hydrocracking regime. Irrespective of the hydrocracking regime for pure n-octane, its conversion and isomer yields were significantly lowered upon admixture of tert-butylcyclohexane. On the other hand, n-octane admixture did not impact the tert-butylcyclohexane conversion nor its cyclic isomer yields. Upon methylcyclohexane admixture with n-decane, no impact was observed over the catalyst ensuring ideal hydrocracking of pure n-decane. Over the catalyst with significantly lower Pt loading, which does not ensure ideal hydrocracking of n-decane, methylcyclohexane lowered the n-decane conversion. A slightly negative impact of n-decane admixture on methylcyclohexane conversion was also observed. The observed effects are mainly attributed to the differences in adsorption strengths within the zeolite pores on top of differences in alkane and cycloalkane adsorption on the metal sites.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2022.123651