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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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Bronsted-Lowry Acids and Bases02:58

Bronsted-Lowry Acids and Bases

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The acid-base reaction class has been studied for quite some time. In 1680, Robert Boyle reported traits of acid solutions that included their ability to dissolve many substances, to change the colors of certain natural dyes, and to lose these traits after coming in contact with alkali (base) solutions. In the eighteenth century, it was recognized that acids have a sour taste, react with limestone to liberate a gaseous substance (now known to be CO2), and interact with alkalis to form neutral...
102.9K
Titration in Nonaqueous Solvents01:16

Titration in Nonaqueous Solvents

1.3K
Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
1.3K
Lewis Acids and Bases02:33

Lewis Acids and Bases

47.9K
In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
47.9K
Lewis Acids and Bases02:16

Lewis Acids and Bases

16.3K
This lesson delves into Lewis acids and bases in the context of the octet rule for electron-deficient compounds. Here, the concept is discussed, emphasizing the group 13 elements like boron or aluminium. Since group 13 elements possess three valence electrons, they form trivalent compounds with a sextet of electrons and a vacant orbital for the central atom. Consequently, these electron-deficient compounds accept electrons from other species to complete their octet in a chemical reaction. They...
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Brønsted-Lowry Acids and Bases02:16

Brønsted-Lowry Acids and Bases

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In 1923, the Brønsted–Lowry definition of acids and bases was proposed by Johannes Brønsted and Thomas Lowry. According to this theory, a Brønsted acid is defined as a species that donates a proton in a chemical reaction and gets converted to its conjugate base. A Brønsted base is defined as a species that accepts a proton in a chemical reaction and gets converted into its conjugate acid. These transfers of protons are caused by the displacement of electrons in these reactions, which is...
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電気伝導性の惰性固体との接触は,固有の異質なブロンステッド酸触媒を変化させる

Bhavish Dinakar1, Juan F Torres2, Mostapha Dakhchoune1

  • 1Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139, United States.

Journal of the American Chemical Society
|December 9, 2025
PubMed
まとめ

不活性な固体との接触によって引き起こされる触媒の偏化により,液相反応速度は予想外に変化する. この発見は 粒子の相互作用を制御することで 化学反応を制御する新しいアプローチを 提供しています

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Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

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科学分野:

  • 異質な触媒
  • 表面化学
  • 電気化学

背景:

  • 異質な触媒の界面電場は液相反応運動に影響する.
  • 電気場は通常,ポテンチオスタットまたはリドックス活性種によって生成されます.
  • 触媒の偏化は反応速度に影響する現象である.

研究 の 目的:

  • 不活性な固体との接触によって誘発される触媒の偏振を調査する.
  • 物理的な接触によって 反応速度を制御する 新しい方法を実証する
  • 異質な触媒におけるコンタクト誘発のポラライゼーションの影響を調査する.

主な方法:

  • モデル反応として,1-メチルcyclopentanolを1-メチルcyclopenteneに脱水した.
  • 炭素ナノチューブに Brønsted酸カルボキシル酸群を触媒として使用した.
  • 不活性な,熱的に還元された炭素ナノチューブと接触した時の反応速度の変化を調査した.

主要な成果:

  • 触媒が不活性な固体と接触すると,反応速度が大きく変化する.
  • 接触による効果は,混ぜた触媒粉末で標準的な実験条件下で観察された.
  • 分子同士の接触により,反応速度は約8倍に低下した.

結論:

  • 触媒の極化は,慣性有電固体との単純な接触によって発生し,内在の反応速度が変化する.
  • このコンタクト誘発の偏振は,液相反応運動を制御するための新しい戦略を示している.
  • 発見は,触媒粒子が惰性物質と相互作用する異質な触媒に広範囲に及ぶ.