Simulation of methanol-to-olefin reaction over SAPO-34 catalysts with different particle sizes: Formation of active sites and deactivation |
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Authors: | Hag Geum Kim Kwang Young Lee Hoi-Gu Jang Yo Soon Song Gon Seo |
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Affiliation: | (1) State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116024, China; |
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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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