Abstract
In the literature, it has been shown that the hydrocarbon cracking activity of a zeolite particle can be greatly enhanced by steam treatment. The extent of enhancement depends on the process condition. Recently, it has been shown that under conditions where the reaction is dominated by the monomolecular mechanism, the turnover frequency and the intrinsic activation energy for cracking are practically unchanged by steaming. However, a much larger difference in activity can be observed under conditions where bimolecular and oligomeric cracking dominate. Thus, the phenomenon of enhanced activity by steaming can be explained by the possibility that the bimolecular and oligomeric cracking reactions are pore diffusion-limited. Steaming generates defects in the zeolite particle, increases the external surface area for diffusion, which then leads to the large enhancement in the observed activity.
| Original language | English |
|---|---|
| Pages (from-to) | 23-33 |
| Number of pages | 11 |
| Journal | Studies in Surface Science and Catalysis |
| Volume | 122 |
| Publication status | Published - 1999 |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Catalysis
Cite this
Intrinsic activities and pore diffusion effect in hydrocarbon cracking in steamed y zeolite. / Kung, H. H.
In: Studies in Surface Science and Catalysis, Vol. 122, 1999, p. 23-33.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Intrinsic activities and pore diffusion effect in hydrocarbon cracking in steamed y zeolite
AU - Kung, H. H.
PY - 1999
Y1 - 1999
N2 - In the literature, it has been shown that the hydrocarbon cracking activity of a zeolite particle can be greatly enhanced by steam treatment. The extent of enhancement depends on the process condition. Recently, it has been shown that under conditions where the reaction is dominated by the monomolecular mechanism, the turnover frequency and the intrinsic activation energy for cracking are practically unchanged by steaming. However, a much larger difference in activity can be observed under conditions where bimolecular and oligomeric cracking dominate. Thus, the phenomenon of enhanced activity by steaming can be explained by the possibility that the bimolecular and oligomeric cracking reactions are pore diffusion-limited. Steaming generates defects in the zeolite particle, increases the external surface area for diffusion, which then leads to the large enhancement in the observed activity.
AB - In the literature, it has been shown that the hydrocarbon cracking activity of a zeolite particle can be greatly enhanced by steam treatment. The extent of enhancement depends on the process condition. Recently, it has been shown that under conditions where the reaction is dominated by the monomolecular mechanism, the turnover frequency and the intrinsic activation energy for cracking are practically unchanged by steaming. However, a much larger difference in activity can be observed under conditions where bimolecular and oligomeric cracking dominate. Thus, the phenomenon of enhanced activity by steaming can be explained by the possibility that the bimolecular and oligomeric cracking reactions are pore diffusion-limited. Steaming generates defects in the zeolite particle, increases the external surface area for diffusion, which then leads to the large enhancement in the observed activity.
UR - http://www.scopus.com/inward/record.url?scp=37849188123&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=37849188123&partnerID=8YFLogxK
M3 - Article
VL - 122
SP - 23
EP - 33
JO - Studies in Surface Science and Catalysis
JF - Studies in Surface Science and Catalysis
SN - 0167-2991
ER -