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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Activation Energies for the Reaction of Ethoxy Species to Ethene over Zeolites
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Activation Energies for the Reaction of Ethoxy Species to Ethene over Zeolites

机译：沸石上乙氧基与乙烯反应的活化能

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摘要

Dehydration of ethanol to ethene on acidic OH groups of zeolites was observed by infrared (IR) spectroscopy and temperature programmed desorption (TPD). The rate of decomposition of surface ethoxy groups was measured by measuring the amount of recovered acidic OH groups by IR, while confirming the evolution of ethene using a mass spectrometer, for the estimation of activation energy. The obtained activation energies for the evolution of ethene from ethoxy groups on hydrogen form mordenite, ZSM-5, and ferrierite zeolites were 161 ± 6, 181 ± 2, and 188 ± 2 kJ·mol~(-1), respectively. A tendency was found that the activation energy became larger in smaller-pored zeolite. The cause of the difference of three zeolites in activation energy for ethene evolution from ethoxy species is discussed along with an energy diagram described from reported theoretical examinations.
机译：通过红外（IR）光谱和程序升温脱附（TPD）观察到乙醇在沸石的酸性OH基上脱水成乙烯。通过用IR测量回收的酸性OH基团的量来测量表面乙氧基的分解速率，同时使用质谱仪确认乙烯的析出，以估计活化能。氢从丝光沸石，ZSM-5和镁碱沸石上脱除氢上的乙氧基而获得的活化能分别为161±6、181±2和188±2 kJ·mol〜（-1）。发现趋势是在较小孔的沸石中活化能变大。讨论了三种沸石活化能差异的原因，这些活化能用于从乙氧基物质释放出乙烯的过程中，并结合已报道的理论研究中描述的能量图进行了讨论。

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