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首页> 外文期刊>Catalysis science & technology >Strain-induced changes to the methanation reaction on thin-film nickel catalysts
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Strain-induced changes to the methanation reaction on thin-film nickel catalysts

机译：应变改变甲烷化反应在镍催化剂薄膜

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摘要

We investigate how mechanical strain can directly manipulate the catalytic rate of a purely thermochemical reaction. Specifically, this work applies strain to a nickel-based thin film catalyst used in carbon monoxide methanation, which can serve as a key step in obtaining useful hydrocarbon fuels from biomass lignin. Previous computational literature has suggested that the application of mechanical strain can increase the activity of nickel-based catalysts in this reaction, making them a more attractive low-cost alternative to other more active catalysts. To directly apply strain in a high-temperature reactor, we designed a novel two-cell reactor which allowed us to use static air pressure to create a strained thin-film catalyst, ultimately measuring strain-induced changes in catalyst activity. In contrast with earlier theoretical predictions, increased tensile strain caused a decrease in activity rather than the increase which was originally expected. A re-examination of the computational reaction data suggests that the reaction model previously employed, which used a single parameter (CO dissociation energy) to predict catalyst activity, was overly simplified. It is likely that hydrogenation reaction steps have some rate-determining behavior and should be incorporated into the reaction model.
机译：我们研究机械应变如何直接操纵一个纯粹的催化速率热化学反应。适用于镍基薄膜应变用于一氧化碳甲烷化催化剂,这可以作为获取有用的关键步骤是什么从生物质木质素碳氢燃料。计算文献建议应用机械应变能增加镍基催化剂的活性反应,使他们更有吸引力的低成本选择其他更积极的催化剂。直接应用在高温应变反应堆,我们设计了一种新颖的两个反应堆允许我们使用静态空气压力吗创建一个紧张的薄膜催化剂,最终测量应变变化的催化剂活动。预测,增加引起的拉伸应变活动减少而不是增加最初的预期。计算反应的数据表明反应模型之前使用,使用一个参数(CO离解能)预测催化剂活性,是过度的简化。反应步骤有一些速度决定行为,应该纳入反应模型。

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