Comparative study of Pt/zeolites for n-hexadecane hydroisomerization: EU-1, ZSM-48, ZSM-23, ZSM-22, and ZSM-12

[Display omitted] •Synthesized zeolites: EU-1, ZSM-48, ZSM-23, ZSM-12, and ZSM-22.•Pt-loaded zeolite catalysts exhibited varying n-hexadecane hydroisomerization activity.•Pt/ZSM-22 favored mono-branched isomers, while Pt/ZSM-12 favored multi-branched isomers.•Coke formation was influenced by channel...

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Published in:Chemical engineering science 2024-04, Vol.287, p.119785, Article 119785
Main Authors: Wang, Qiang, Sim, Ley Boon, Xie, Jianrong, Ye, Songshou, Fu, Jile, Wang, Jiexiang, Zhang, Nuowei, Zheng, Jinbao, Chen, Binghui
Format: Article
Language:English
Subjects:
Bifunctional catalyst
Hydroisomerization
Shape-selectivity
Zeolites
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Summary:[Display omitted] •Synthesized zeolites: EU-1, ZSM-48, ZSM-23, ZSM-12, and ZSM-22.•Pt-loaded zeolite catalysts exhibited varying n-hexadecane hydroisomerization activity.•Pt/ZSM-22 favored mono-branched isomers, while Pt/ZSM-12 favored multi-branched isomers.•Coke formation was influenced by channel structure and Brønsted acid content. The hydroisomerization of n-hexadecane was investigated using bifunctional platinum catalysts supported on EU-1, ZSM-48, ZSM-23, ZSM-22, and ZSM-12 zeolites. These one-dimensional microporous zeolites were synthesized at 160 ℃ with an Si/Al molar ratio of 60, and 0.5 wt% Pt was loaded onto them using the impregnation method. The findings indicate that Brønsted acidity predominantly influences the conversion to n-hexadecane over 10 membered ring zeolites. Additionally, ZSM-12, characterized by a 12-ring channel, exhibits preferential activity in this regard. The apparent activation energy for the reactions increased from 81 kJ/mol (Pt/ZSM-23) to 134 kJ/mol (Pt/ZSM-48) across all tested catalysts. Pt/ZSM-22 demonstrated high selectivity towards mono-branched isomers, whereas Pt/ZSM-12 favored the formation of multi-branched isomers. The isomer selectivity trend was Pt/ZSM-22 > Pt/ZSM-12 > Pt/EU-1 > Pt/ZSM-48 > Pt/ZSM-23. Moreover, TG analysis of spent catalysts unveiled that coke formation on these zeolites was chiefly influenced by zeolite channel structure and Brønsted acid content. The average coke selectivity followed this order: Pt/EU-1 > Pt/ZSM-12 > Pt/ZSM-48 > Pt/ZSM-22 > Pt/ZSM-23.
ISSN:0009-2509
1873-4405
DOI:10.1016/j.ces.2024.119785