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Received June 12, 2010
Accepted July 21, 2010
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Simulation of methanol-to-olefin reaction over SAPO-34 catalysts with different particle sizes: Formation of active sites and deactivation
Department of Environmental and Chemical Engineering, Seonam University, Namwon, Jeonbuk 590-170, Korea 1School of Applied Chemical Engineering and the Research Institute for Catalysis, Chonnam National University, Yongbong-dong 300, Gwangju 500-757, Korea
gseo@chonnam.ac.kr
Korean Journal of Chemical Engineering, November 2010, 27(6), 1773-1779(7), 10.1007/s11814-010-0385-2
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Abstract
Conversion profiles of methanol-to-olefin (MTO) reaction over SAPO-34 catalysts with different particle sizes were simulated using two kinetic models. The MTO reaction was assumed to consist of three steps: the formation of hexamethylbenzene (HMB), the production of lower olefins over HMB and the further condensation of HMB to polyaromatic hydrocarbons. To reflect the effect of particle size on the MTO reaction, only the space near the external particle surface was considered to be available for HMB formation in Model I, whereas an effectiveness factor and a deactivation function were introduced in Model II. The simulated conversion profiles of the MTO reaction by both models successfully confirmed the presence of an induction period and deactivation, but Model II showed a better agreement between the experimental and simulated results because of its inclusion of the deactivation function and its consideration for the gradient of methanol concentration.
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Chen D, Moljord K, Fuglerud T, Holmen A, Micropor. Mesopor. Mater., 29, 191 (1999)
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