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LaNi5を用いた CO2とH2からのCH4の生成

机译:使用LaNi 5 从CO 2 和H 2 生成CH 4

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Methane production from carbon dioxide and hydrogen is known as the Sabatier reaction. However, methanation process by the Sabatier reaction requires high temperatures and high pressures. Therefore, we tried to generate methane by mechanochemical method, using ball-milling as a new methanation process. As a result of ball milling for 3 hours at room temperature, generation of methane was observed. On the other hand, carbon dioxide was consumed more than expected. As for further verification, ball-milling was carried out for 6 hours under carbon dioxide atmosphere. EDX elemental analysis of the milled powder revealed significantly increased carbon content, suggesting the reaction of LaNi_(5) surface with CO_(2) followed by the formation of carbides or carbonates of La or Ni. A unique XRD profile was observed in the milled sample, yielding broad amorphous-like peak, possibly from La, and broad peak of Ni. It was shown that ball milling may cause phase separation into La and Ni not only in hydrogen atmosphere but also in carbon dioxide atmosphere.
机译:由二氧化碳和氢气产生的甲烷被称为Sabatier反应。然而,通过Sabatier反应的甲烷化过程需要高温和高压。因此,我们试图通过机械化学方法,将球磨作为一种新的甲烷化工艺来产生甲烷。在室温下球磨3小时的结果是,观察到甲烷的产生。另一方面,二氧化碳的消耗量超过了预期。为了进一步验证,在二氧化碳气氛下进行球磨6小时。研磨后的粉末的EDX元素分析显示碳含量显着增加,表明LaNi_(5)表面与CO_(2)反应,随后形成La或Ni的碳化物或碳酸盐。在研磨后的样品中观察到独特的XRD轮廓,产生可能来自La的宽非晶态峰和Ni宽峰。结果表明,球磨不仅会在氢气气氛中而且还会在二氧化碳气氛中导致相分离成La和Ni。

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