Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 182, Issue -, Pages 244-249Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2013.04.010
Keywords
Kinetic analysis; Catalytic cracking; Crystal size; MFI-type zeolite; n-Hexane
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Funding
- Grants-in-Aid for Scientific Research [25630352] Funding Source: KAKEN
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A kinetic study of n-hexane cracking over MFI-type zeolite was conducted in the temperature range from 748 to 923 K using a fixed-bed flow reactor under atmospheric pressure. The n-hexane cracking reaction exhibited first-order kinetics with respect to n-hexane concentration. In contrast, the activation energy for n-hexane cracking at high temperatures (823-923 K) was greater than that at low temperatures (748-823 K) because the major reaction mechanism shifted from monomolecular cracking to bimolecular cracking as reaction temperature decreased. Crystal size of the MFI-type zeolite needed to achieve reaction-control conditions, in which the active sites within zeolite are fully utilized during n-hexane cracking, was investigated using the kinetic data. The effect of crystal size and Si/Al ratio of the zeolite on the rate-limiting step of the n-hexane cracking could be expressed using the Thiele modulus. Results indicated that the size of the zeolite must be less than several hundred nanometers for the reaction to proceed under reaction-control conditions. (C) 2013 Elsevier Inc. All rights reserved.
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