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相关概念视频

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
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Similar to water, alcohols can add to the carbonyl carbon of the aldehydes and ketones. The addition of one molecule of alcohol to the carbonyl compound forms the hemiacetal or half acetal. As depicted below, in a hemiacetal, the carbon is directly linked to an OH and OR group.
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Pt-Ga/C催化剂的Ga-修饰近表面成分通过C2中间体促进高效电化学乙醇氧化

Wei Yan1, Guang Li1, Shuangshuang Cui1

  • 1State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China.

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|July 26, 2023
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概括
此摘要是机器生成的。

一种新的电催化剂 (Pt3Ga) 在中等电位下有效氧化乙醇到二氧化碳. 这种Pt3Ga/C催化剂避免了C-C键解离的限制,使乙醇氧化反应 (EOR) 的可持续能量转化成为可能.

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科学领域:

  • 电化学
  • 材料科学
  • 催化剂

背景情况:

  • 电化学乙醇氧化 (EOR) 经常面临由于乙醇中C-C键解离的局限性.
  • 现有的产生二氧化碳的EOR途径通常涉及效率较低的C1中间体.
  • 为了实现 CO2 的 EOR,需要克服动力限制,特别是在中等电位.

研究的目的:

  • 通过EOR开发一种Pt3Ga/C电催化剂,以高效地产生二氧化碳.
  • 为了在中等电位 (>0.3V与SCE) 上实现C2中间体的直接和持续氧化.
  • 调查 Pt3Ga/C 催化剂增强 EOR 性能背后的机制.

主要方法:

  • 一种具有均 Ga 分布的 Pt3Ga/C 电催化剂的合成和表征.
  • 在EOR中对催化剂性能进行电化学评估.
  • 在现场电化学里埃变换反射光谱 (FTIR) 和同位素标记研究.
  • 密度函数理论 (DFT) 计算以支持机械学理解.

主要成果:

  • 在中等电位下,Pt3Ga/C催化剂有效地从EOR产生二氧化碳.
  • 催化剂结构通过避免桥式吸附来防止有毒的*CH和*CO物种的形成.
  • 从Ga到Pt的电子再分配减少了*O/*OH吸附和CO中毒,暴露了更多的活性位点.
  • 由Ga的水友性促进的H2O解离促进了C2中间体的深度氧化.

结论:

  • 在EOR中,Pt3Ga/C作为直接C2中间氧化的高效电催化剂.
  • 在中等电位条件下,催化剂能够在没有动力限制的情况下产生二氧化碳.
  • 这项工作在可持续的乙醇氧化反应技术中取得了重大进展.