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Catalysis02:50

Catalysis

26.5K
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.
26.5K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.2K
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...
3.2K
Structural Isomerism02:34

Structural Isomerism

19.1K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.1K
Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

Preparation of Amines: Reduction of Oximes and Nitro Compounds

3.3K
Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
3.3K
Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

34.3K
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
34.3K
Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

11.8K
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...
11.8K

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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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探索双铁原子催化剂以实现高效的降低:关于结构和电子优化的综合研究.

Zhe Zhang1, Wenxin Ma1, Jiajie Qiao1

  • 1College of Physics Science and Technology, Yangzhou University, Jiangsu 225009, China. zzhang@yzu.edu.cn.

Nanoscale
|May 22, 2025
PubMed
概括

本研究介绍了Fe2N3B@G催化剂,通过降解反应 (NRR) 高效合成氨. 新的双铁原子站点和-共兴奋剂增强了NRR性能和选择性,为氨生产提供了一条绿色途径.

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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
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科学领域:

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

背景情况:

  • 氨合成对农业和工业至关重要.
  • 降解反应 (NRR) 为Haber-Bosch过程提供了一种绿色替代方案.
  • 为NRR开发高效的催化剂是一个重大挑战.

研究的目的:

  • 设计和研究用于增强NRR的新型双铁原子位点催化剂.
  • 探索-联合兴奋剂对石墨烯支持铁催化剂 (Fe2NxBy@G) 的影响.
  • 使用计算方法阐明NRR催化机制.

主要方法:

  • 具有不同兴奋剂比率的Fe2NxBy@G催化剂的计算选.
  • 密度函数理论 (DFT) 计算以确定反应路径和能量.
  • 机器学习分子动力学 (MLMD) 模拟以验证催化活性.
  • 分子动力学 (MD) 模拟以评估热稳定性.

主要成果:

  • Fe2N3B@G 显示出优越的NRR活性,在远端通路中自由能量最低 (0.32 eV).
  • 联合兴奋剂优化了铁站点的电子环境,增强了N2吸附和化.
  • MLMD模拟证实了高效的NH3生成和脱落,抑制了进化反应 (HER).
  • Fe2N3B@G 呈现出更高的 HER 过度潜能,改善了对 NRR 的选择性.
  • 模拟的MD显示了高达500K的良好热稳定性.

结论:

  • Fe2N3B@G 是降解反应的高效和选择性催化剂.
  • -联合兴奋剂是设计先进原子催化剂的一个有希望的策略.
  • 该研究提供了对优化氨合成催化剂电子结构的理论见解.