Mechanistic Aspects of n-Paraffins Hydrocracking: Influence of Zeolite Morphology and Acidity of Pd(Pt)/ZSM-5 Catalysts: Influence of zeolite morphology and acidity of Pd(Pt)/ZSM-5 catalysts

Lingqian Meng, G. Vanbutsele, Robert Pestman, A. Godin, Douglas E. Romero Hidalgo, Arno J.F. van Hoof, Lu Gao, Tobias Kimpel, Jiachun Chai, Johan A. Martens (Corresponding author), Emiel J.M. Hensen (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

The influence of zeolite domain size, acidity, and metal type on n-decane and n-nonadecane hydroconversion was investigated for bifunctional Pd(Pt)/ZSM-5 zeolite (bulk, desilicated, thin and thick nanosheets). Decreasing the size of zeolitic domains to a few nanometers results in lower overall activity, higher skeletal isomerization yield, and an imbalance between metal and acid functions. These changes are attributed to a lower pore occupancy of olefinic intermediates due to the substantially larger external surface of nanosheets and higher desorption rates. Well-balanced bifunctional behavior and higher activity of nanosheet ZSM-5 can be achieved by strengthening the metal function or lowering the acidity. The influence on the isomerized and cracked product fractions is also discussed. Hydroconversion of n-nonadecane gave low yields of skeletal isomers over all Pd-loaded ZSM-5 catalysts and led to significant over-cracking due to the long intracrystalline residence times of the long hydrocarbon reactant.

Original languageEnglish
Pages (from-to)544-555
Number of pages12
JournalJournal of Catalysis
Volume389
DOIs
Publication statusPublished - Sep 2020

Keywords

  • Acidity
  • Mechanism
  • n-paraffins hydroconversion
  • Nanosheet
  • ZSM-5

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