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相关概念视频

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

129
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
129
Catalysis02:50

Catalysis

32.6K
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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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

3.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.9K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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拉提二固体光催化剂中被困状态敏感的动力学,具有和没有共催化剂加载.

Rupashree Balia Singh1, Hiroyuki Matsuzaki, Yohichi Suzuki

  • 1National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.

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概括

了解LaTiO2N (LTON) 光催化剂中的电荷载体捕获是关键. 这项研究揭示了能量分布的捕获状态及其对光催化活性的影响,这对有效的太阳能转化至关重要.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 光催化作用的光催化
  • 频谱学是一种光谱学.

背景情况:

  • 电荷载体被困在光催化剂中,通过影响电子孔分离和再组合,显著影响性能.
  • 光催化剂中的缺陷状态可以充当有益的捕获点或有害的重组中心.
  • 兰酸化 (LaTiO2N或LTON) 是一个有前途的可见光响应光催化剂.

研究的目的:

  • 研究被困电荷载体在LaTiO2N (LTON) 光催化机制中的作用.
  • 为了阐明CoOx共催化剂加载对LTON中电荷载体动态的影响.
  • 了解LTON中的光催化动力学对激发波长的依赖.

主要方法:

  • 采用5秒的扩散反射谱法来探测超快电荷载体的动态.
  • 实验是在赤裸的LTON和装有CoOx的LTON (2重 %的CoOx-LTON) 上进行的.
  • 使用不同的激发波长来评估能量输入对载体生成和捕获的影响.

主要成果:

  • 在赤裸的LTON中观察到能量分布的被困状态的证据,影响其动力学.
  • CoOx共催化剂主要在波段间隙以上刺激下影响动力学,表明对表面载体的影响.
  • 光催化动力学表现出明显的依赖激发波长,与观察到的被困状态一致.

结论:

  • 能量分布的捕获状态在LTON的光催化性能中起着至关重要的作用.
  • CoOx共催化剂的作用与在更高能量的激发下产生表面载体有关.
  • 图秒电荷载体动态为优化CoOx/LTON光催化剂的机制提供了洞察力.