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Catalysis02:50

Catalysis

27.3K
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.
27.3K
Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

48.9K
The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

12.4K
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...
12.4K
Turnover Number and Catalytic Efficiency01:19

Turnover Number and Catalytic Efficiency

10.4K
The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion....
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Updated: Aug 23, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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Pt 原子単層触媒 効率的なCO酸化のための欠陥強化セリアに埋め込まれた

Shaohua Xie1, Liping Liu2, Yue Lu3

  • 1Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), NanoScience Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States.

Journal of the American Chemical Society
|November 2, 2022
PubMed
まとめ
この要約は機械生成です。

制御された協調構造を持つプラチナ単原子触媒は,CO酸化を促進します. セリアアルミナ基に埋め込まれたプラチナ原子単層は,優れた活性と安定性を示しています.

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科学分野:

  • カタリシス
  • 材料科学
  • 表面化学

背景:

  • メタルサイトの局所的な調整構造は,サポートされた金属触媒の性能にとって極めて重要です.
  • 単原子触媒 (SAC) の調整環境を制御することは,その活動を最適化するための鍵です.

研究 の 目的:

  • プラチナ原子単層 (PtASL) 構造をセリアアルミナ基に制御された局所調整環境 (埋め込み対吸収) で製造する.
  • 還元活性化中のPt1局所調整の触媒活動と構造進化への影響を調査する.

主な方法:

  • PtASL構造を製造するための表面欠陥強化戦略.
  • Pt1の局所的調整と分散の特徴
  • CO酸化のための触媒活動の評価

主要な成果:

  • 精密に制御された埋め込みおよび吸収されたPtASL構造で100%の金属分散を達成しました.
  • 埋め込まれたPtASLは,CO酸化のためのアドソーブされたPtASLよりも3.5倍高い周回頻度を示した.
  • 埋め込まれたPtASLは,Pt単一原子 (Pt1) に比べて10〜70倍高い活性を示した.
  • 好ましいCO吸収と強化された格子酸素活性化は,埋め込まれたPtASLよりも優れたCO酸化に貢献しました.

結論:

  • Pt1の局所的な調整環境は,触媒活動と構造的安定性に大きく影響する.
  • セリアアルミナにPtASLを埋め込むことは,高性能触媒のための有望な経路を提供します.
  • 精密な制御により,100%の原子利用効率と最適の触媒活性が得られます.