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Hydrogenation06:06

Hydrogenation

51.7K
Source: Vy M. Dong and Zhiwei Chen, Department of Chemistry, University of California, Irvine, CA
This experiment will demonstrate the hydrogenation of chalcone as an example of an alkene hydrogenation reaction (Figure 1). In this experiment, palladium on carbon (Pd/C) will be used as a heterogeneous catalyst for the process. A balloon will be used to supply the hydrogen atmosphere.
51.7K
Synthesis of an Oxygen-Carrying Cobalt(II) Complex11:46

Synthesis of an Oxygen-Carrying Cobalt(II) Complex

53.3K
Source: Deepika Das, Tamara M. Powers, Department of Chemistry, Texas A&M University
Bioinorganic chemistry is the field of study that investigates the role that metals play in biology. Approximately half of all proteins contain metals and it is estimated that up to one third of all proteins rely on metal-containing active sites to function. Proteins that feature metals, called metalloproteins, play a vital role in a variety of cell functions that are necessary for life. Metalloproteins...
53.3K
Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment11:38

Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment

8.1K
Efficient solar-hydrogen production has recently been realized on functionalized semiconductor-electrocatalyst systems in a photoelectrochemical half-cell in microgravity environment at the Bremen Drop Tower. Here, we report the experimental procedures for manufacturing the semiconductor-electrocatalyst device, details of the experimental set-up in the drop capsule and the experimental sequence during free...
8.1K
Hydrogen Bonds00:26

Hydrogen Bonds

131.4K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
131.4K
Hydrogen Bonds01:04

Hydrogen Bonds

13.3K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
13.3K
Preparation of SNS Cobalt(II) Pincer Model Complexes of Liver Alcohol Dehydrogenase06:31

Preparation of SNS Cobalt(II) Pincer Model Complexes of Liver Alcohol Dehydrogenase

7.6K
The preparation of SNS pincer cobalt(II) model complexes of liver alcohol dehydrogenase is presented here. The complexes can be prepared by reacting the ligand precursor with CoCl2·6H2O and can then be recrystallized by allowing diethyl ether to slowly diffuse into an acetonitrile solution that contains the cobalt...
7.6K

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Updated: Jan 20, 2026

Catalytic Hydrogenation of Alkene: Applications in Chemistry
06:06

Catalytic Hydrogenation of Alkene: Applications in Chemistry

Published on: April 30, 2023

51.7K

コバルト・フォスフィードに対する水素

Murielle F Delley1, Zishan Wu1, M Elizabeth Mundy2

  • 1Department of Chemistry , Yale University , New Haven , Connecticut 06520-8107 , United States.

Journal of the American Chemical Society
|September 4, 2019
PubMed
まとめ
この要約は機械生成です。

コバルト・フォスフィード (CoP) は,水素進化反応 (HER) で地球に豊富に存在する触媒としての役割のために重要な量の反応水素を効果的に結合します. この研究では,COP表面の水素ステキオメトリーと熱化学を定量化します.

さらに関連する動画

Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment
11:38

Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment

Published on: December 3, 2019

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Synthesis of an Oxygen-Carrying [Cosalen]2 Complex
11:46

Synthesis of an Oxygen-Carrying [Cosalen]2 Complex

Published on: April 30, 2023

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関連する実験動画

Last Updated: Jan 20, 2026

Catalytic Hydrogenation of Alkene: Applications in Chemistry
06:06

Catalytic Hydrogenation of Alkene: Applications in Chemistry

Published on: April 30, 2023

51.7K
Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment
11:38

Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment

Published on: December 3, 2019

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Synthesis of an Oxygen-Carrying [Cosalen]2 Complex
11:46

Synthesis of an Oxygen-Carrying [Cosalen]2 Complex

Published on: April 30, 2023

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科学分野:

  • 材料科学
  • カタリシス
  • 電気化学

背景:

  • コバルト酸化物 (CoP) は,水素進化反応 (HER) の有望な地球豊富な触媒である.
  • 触媒表面の水素結合を理解することは,HERの効率を最適化するために重要です.
  • 移行金属のリン酸化物の水素結合エネルギーに関する実験データは少ない.

研究 の 目的:

  • コバルト・フォスフィード (CoP) に結合した水素のステキオメトリと熱化学を実験的に測定する.
  • メソスケールとナノ粒子COPの両方で水素の存在と反応性を調査する.
  • CoPの水素結合特性に基づいて,その触媒特性に関する新しい視点を提供する.

主な方法:

  • アルキン水素化とH原子移転反応を用いた結合水素の定量化.
  • 様々な反応剤を用いた反応性研究による水素結合自由エネルギーの推定.
  • 水素化されたCOPの構造的変化を検出するために,X線吸収スペクトロスコーピーを操作する.

主要な成果:

  • H2による処理により,かなりの量の反応性水素がCOP (約 COP 単位あたり 0.2 H).
  • CoP上のH原子の推定結合自由エネルギーは51~66 kcal mol−1の範囲にある.
  • オペランドXASは,グリッドの膨張を示し,水素化時にコエフェクトな核電荷の有意な変化を示さなかった.

結論:

  • CoPの表面にはかなりの量の反応性水素があり,その触媒および電気触媒性能に影響します.
  • 実験的アプローチは,他の材料に対する水素結合を研究するための方法を提供します.
  • これらの発見は,HERにおけるCOPおよび関連する反応のメカニズムに関する根本的な洞察を提供します.