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関連する概念動画

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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...
Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
Catalysis02:50

Catalysis

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.
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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...
Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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 surface of...
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.

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Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
12:08

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Published on: June 24, 2022

プラチナ配列触媒の形状に依存する活性

Vladimir Komanicky1, Hakim Iddir, Kee-Chul Chang

  • 1Safarik University, Faculty of Sciences and, Institute of Experimental Physics, SAS, Kosice 04154, Slovakia. vladimir.komanicky@upjs.sk

Journal of the American Chemical Society
|April 8, 2009
PubMed
まとめ
この要約は機械生成です。

ストロンチウムチタネート基板にプラチナ触媒ナノ粒子を作りました. 燃料電池にとって極めて重要な酸素還元反応の活動に,それらの特殊な側面の配置が著しく影響する.

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A Salt-Templated Synthesis Method for Porous Platinum-based Macrobeams and Macrotubes

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Last Updated: Jun 24, 2026

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
12:08

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Published on: June 24, 2022

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A Salt-Templated Synthesis Method for Porous Platinum-based Macrobeams and Macrotubes

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科学分野:

  • 材料科学 材料科学とは
  • 電気化学 電気化学について
  • カタリシス カタリシス カタリシス

背景:

  • プラチナナノ粒子は,特に燃料電池の酸素還元反応において,重要な触媒である.
  • ナノ粒子の形態学と基板の相互作用を制御することは,触媒性能を向上させるための鍵です.
  • 側面特有の活性を理解することは,効率的な触媒の設計に不可欠です.

研究 の 目的:

  • 制御された形質を持つプラチナ触媒ナノ粒子の配列を生産し,特徴づけること.
  • 顕微鏡の構造的特徴とマクロскопの触媒活性を相関させるため.
  • 酸素還元反応における異なる結晶学的側面の役割を調査する.

主な方法:

  • ストロンチウムチタネート基板上のプラチナナノ粒子のエピタキシアル成長 ((111), (100), (110)).
  • 精密なナノ粒子配列製造のために電子束リトグラフィーを利用する.
  • 酸素還元反応の触媒活性に関する電気化学的評価.

主要な成果:

  • 数百万個の形態学的に同一のプラチナナノ粒子が,順番に配列で成功裏に生産されました.
  • 触媒活性は (111) 面と (100) 面の異なる比率で変化した.
  • 増加した活動は,異なる酸素親和性を持つ面間の協力的効果を示唆しています.

結論:

  • 面 (100) の表面積は,酸素還元のための触媒性能の重要な要因である.
  • プラチナ触媒の側面エンジニアリングは,燃料電池の効率を改善するための経路を提供します.
  • 異なる結晶面間の協力的な相互作用は,触媒反応性を高めます.