Methanol to olefins: Activity and stability of nanosized SAPO-34 molecular sieves and control of selectivity by silicon distribution

Zhibin Li, Joaquín Martínez-Triguero, Patricia Concepción, Jihong Yu, Avelino Corma*

*此作品的通讯作者

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摘要

Nano-SAPO-34 molecular sieves synthesized in a microwave environment with 20 nm crystal size showed a longer lifetime than SAPO-34 prepared by the conventional hydrothermal method in the reaction of methanol to olefins. It has been found that silicon distribution strongly affects the lifetime and selectivity. Thus, silicon at the border of the silicon islands gives a higher lifetime and lower C2/C3 ratio. This change in activity and selectivity is better explained in terms of different silicon distribution than by preferential diffusion of ethene through the 8MR pores and agrees with transition-state selectivity. The effects of equilibrium of olefins and deactivation by coke were isolated, showing that after full formation of the hydrocarbon pool, selectivity is independent of deactivation by coke. This journal is

源语言英语
页(从-至)14670-14680
页数11
期刊Physical Chemistry Chemical Physics
15
35
DOI
出版状态已出版 - 21 9月 2013
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Li, Z., Martínez-Triguero, J., Concepción, P., Yu, J., & Corma, A. (2013). Methanol to olefins: Activity and stability of nanosized SAPO-34 molecular sieves and control of selectivity by silicon distribution. Physical Chemistry Chemical Physics, 15(35), 14670-14680. https://doi.org/10.1039/c3cp52247d