Towards understanding the enhanced cracking activity of steamed Y zeolites

Harold H Kung, B. A. Williams, S. M. Babitz, J. T. Miller, R. Q. Snurr

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Ultrastable Y (H-USY) zeolite, prepared by steam treatment of Y zeolite, is a very active hydrocarbon cracking catalyst. However, the extent of enhancement in activity compared to a non-steamed sample depends on the reaction condition. A model that has been proposed to explain this behavior is summarized. The model incorporates the three different mechanisms for hydrocarbon cracking, and the dependence of their rates on the partial pressures of reactants and products and temperature. Depending on the reaction condition, such as hydrocarbon pressure, temperature, and conversion, the predominant cracking reaction mechanism may differ. The change in the predominant mechanism may also be a result of the proportionally small increase in external surface area caused by the steaming-induced structural destruction of the zeolite particles. However, these relatively small changes can lead to a much larger overall effect on the cracking rate because of the sensitive dependence of oligomeric cracking, and to a lesser extent, bimolecular cracking on the alkene partial pressure.

Original languageEnglish
Pages (from-to)91-98
Number of pages8
JournalCatalysis Today
Volume52
Issue number1
Publication statusPublished - Aug 6 1999

Fingerprint

Zeolites
Hydrocarbons
Partial pressure
Steam
Alkenes
Olefins
Temperature
Catalysts

Keywords

  • Cracking activity
  • Steam treatment
  • Ultrastable Y
  • Zeolites

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Kung, H. H., Williams, B. A., Babitz, S. M., Miller, J. T., & Snurr, R. Q. (1999). Towards understanding the enhanced cracking activity of steamed Y zeolites. Catalysis Today, 52(1), 91-98.

Towards understanding the enhanced cracking activity of steamed Y zeolites. / Kung, Harold H; Williams, B. A.; Babitz, S. M.; Miller, J. T.; Snurr, R. Q.

In: Catalysis Today, Vol. 52, No. 1, 06.08.1999, p. 91-98.

Research output: Contribution to journalArticle

Kung, HH, Williams, BA, Babitz, SM, Miller, JT & Snurr, RQ 1999, 'Towards understanding the enhanced cracking activity of steamed Y zeolites', Catalysis Today, vol. 52, no. 1, pp. 91-98.
Kung HH, Williams BA, Babitz SM, Miller JT, Snurr RQ. Towards understanding the enhanced cracking activity of steamed Y zeolites. Catalysis Today. 1999 Aug 6;52(1):91-98.
Kung, Harold H ; Williams, B. A. ; Babitz, S. M. ; Miller, J. T. ; Snurr, R. Q. / Towards understanding the enhanced cracking activity of steamed Y zeolites. In: Catalysis Today. 1999 ; Vol. 52, No. 1. pp. 91-98.
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