Journal
APPLIED CATALYSIS A-GENERAL
Volume 395, Issue 1-2, Pages 95-106Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2011.01.025
Keywords
Methanol; Dimethyl ether; Kinetics; Mechanism; Parameter estimation
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Funding
- SK Energy Co.
- Korea Institute of Energy Technology and Evaluation Planning (KETEP) of the Ministry of Knowledge Economy, Republic of Korea
- Korea Evaluation Institute of Industrial Technology (KEIT) [20097010100021] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Kinetics of the methanol (MeOH) dehydration has been investigated using two kinds of alkali metal-modified ZSM-5 (mZSM-5) catalysts, which were developed for the purpose of preparing dimethyl ether (DME) from water-containing MeOH. Two intrinsic kinetic mechanisms have been suggested and rigorous reaction rate equations were derived based on a series of reaction experiments in the presence and in the absence of water. In addition to the kinetic parameters, the heats of adsorption of MeOH and water were successfully estimated. The values are in good agreement with those obtained from the previously reported experimental results. According to the reaction pathways of our concern, two adsorbed MeOH molecules on the mZSM-5 simultaneously react with acidic sites to produce the intermediate molecule, which then undergoes the rate-determining step that the intermediate molecule rearranges itself to split into the smaller intermediates for the next step with or without the abstraction of water. In addition, the existence of the crucial intermediate closely related to the rate-determining step was also confirmed through FT-IR spectroscopy. (c) 2011 Elsevier B.V. All rights reserved.
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