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相关概念视频

Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

12.2K
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.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
12.2K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.3K
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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Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
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嵌入有缺陷的分层双氧化物中的单原子Pt,用于高效和持久的进化.

Jiamin Li1, Rui-Ting Gao1, Xianhu Liu2

  • 1College of Chemistry and Chemical Engineering, College of Energy Material and Chemistry, Inner Mongolia University, Hohhot 010021, China.

ACS applied materials & interfaces
|August 29, 2023
PubMed
概括

这项研究提出了一种新的单原子催化剂,用于在中性水中有效生产. 缺陷的NiFeMo LDH与单原子实现了演化反应 (HER) 的卓越活性和耐用性.

关键词:
Pt 是单个原子.长期稳定性的长期稳定性她的表现中立,她的表现中立.阶段转换的相位转换.过渡金属 (氧) 氧化物

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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 催化剂是一种催化剂.

背景情况:

  • 在中性条件下的电催化对于使用废水或海水可持续生产气至关重要.
  • 单原子催化剂 (SAC) 对电催化有很大的希望,但很少有人在中性介质中对进化反应 (HER) 有效.

研究的目的:

  • 制定一个简单的战略,在中立条件下为HER创建高度活跃的SAC.
  • 研究物种和单原子对NiFe层状双氧化物 (LDH) 的协同作用,以提高电催化性能.

主要方法:

  • 通过诱导Mo物种和加载超低单原子Pt. 的方法合成缺陷的NiFeMo LDH (V-NiFeMo LDH).
  • 在1M酸盐缓冲溶液中对HER进行电催化测试.
  • 潜在静态极化用于催化剂调制和密度函数理论 (DFT) 计算.

主要成果:

  • 对于HER,V-NiFeMo LDH催化剂在10 mA cm−2时表现出89 mV的超电位.
  • 在V-NiFeMo LDH上对单原子Pt进行调制,在10 mA cm-2下达到37 mV的低电位,持久度超过110小时.
  • Mo和Pt的协同作用,以及相变换,显著降低了水解离屏障,并加速了HER.

结论:

  • 开发的V-NiFeMo LDH与单原子 Pt 是一个高效和持久的催化剂中性HER.
  • 这项工作表明了设计先进的SAC以在中性介质中可持续生产的有希望的方法.