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Catalysis02:50

Catalysis

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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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Turnover Number and Catalytic Efficiency01:19

Turnover Number and Catalytic Efficiency

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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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Introduction to Mechanisms of Enzyme Catalysis01:13

Introduction to Mechanisms of Enzyme Catalysis

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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
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Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
4.8K
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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2つの異なるマイクロ構造間のクロスオーバーによる触媒活動制御

Yuheng Zhou1, Yihan Zhu2, Zhi-Qiang Wang3

  • 1Key Lab of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University , Hangzhou, 310027, China.

Journal of the American Chemical Society
|September 9, 2017
PubMed
まとめ
この要約は機械生成です。

研究者らは,溶媒を切り替えることで,金ナノ粒子 (AuNPs) の可逆微細構造制御を実証した. 多重結合ナノ粒子 (MTP) と単一結晶 (SC) 構造の間のこの変換は,アルコール酸化のための触媒活性を大幅に高めます.

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科学分野:

  • 材料科学
  • ナノテクノロジー
  • キャタリシス

背景:

  • 金属ナノ触媒は異質な触媒に不可欠ですが,活性最適化は粒子のサイズと形状の制御によって制限されています.
  • ナノ粒子の内部微細構造を制御することで 触媒性能を向上させる新しい戦略が生まれます

研究 の 目的:

  • 金ナノ粒子 (AuNPs) の可逆微細構造制御を溶媒による後処理で実証する.
  • アルコール酸化におけるAuNPの触媒活性に対する微細構造変化の影響を調査する.

主な方法:

  • 金ナノ粒子 (AuNPs) の極性 (水,メタノール) および非極性 (チオールリガンドを含むトルーエン) 溶媒を用いた溶媒後処理.
  • 多重結合ナノ粒子 (MTP) と単一結晶 (SC) 構造の間の微細構造の変換を観察するためのインシット伝送電子顕微鏡 (TEM).
  • 異なるAuNPマイクロ構造のアルコール化学吸収の実験的および理論的調査.

主要な成果:

  • AuNPのMTPとSC構造間の可逆変換は,溶媒のスイッチングによって達成された.
  • 極性溶媒はMTPからSCへの変換を誘導し,チオールを含む非極性溶媒はそれを逆転させた.
  • {211}のようなマイクロファセットを特徴とするMTP構造は,アルコールの化学吸収が強化されたために,ガス相アルコールの酸化のための有意に高い触媒活性を示した.

結論:

  • 溶媒による微細構造制御は,金属ナノ触媒の触媒特性を調整する簡単な経路を提供します.
  • MTP AuNPの双子の境界と積み重ねの欠陥の存在は,強いアルコール化学吸収と高い触媒活性に不可欠です.
  • この研究は,内部ナノ粒子の構造を操作することによって,高度なナノ触媒を設計するための新しい道を開きます.