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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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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...
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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,...
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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.
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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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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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El contacto con sólidos inertes eléctricamente conductores altera la catálisis intrínseca del ácido Brønsted

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
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Resumen

La polarización del catalizador, impulsada por el contacto con sólidos inertes, altera inesperadamente las tasas de reacción de la fase líquida. Este descubrimiento ofrece un nuevo enfoque para controlar las reacciones químicas mediante la gestión de las interacciones de partículas.

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Área de la Ciencia:

  • Catálisis heterogénea
  • Química de las superficies
  • La electroquímica

Sus antecedentes:

  • Los campos eléctricos interfaciales en catalizadores heterogéneos influyen en la cinética de la reacción en fase líquida.
  • Los campos eléctricos generalmente se generan a través de potenciales o especies redox activas.
  • La polarización del catalizador es un fenómeno conocido que afecta las tasas de reacción.

Objetivo del estudio:

  • Para investigar la polarización del catalizador inducida por el contacto con sólidos inertes.
  • Para demostrar un nuevo método para controlar las tasas de reacción a través del contacto físico.
  • Explorar las implicaciones de la polarización inducida por contacto en la catálisis heterogénea.

Principales métodos:

  • Se utilizó la deshidratación de 1-metilciclopentanol a 1-metilciclopenteno como reacción modelo.
  • Utilizó grupos de ácido carboxílico de Brønsted en nanotubos de carbono como catalizador.
  • Los cambios en la velocidad de reacción investigados al contacto con nanotubos de carbono inertes reducidos térmicamente.

Principales resultados:

  • El contacto del catalizador con sólidos inertes indujo cambios significativos de orden de magnitud en las velocidades de reacción.
  • Se observaron efectos inducidos por el contacto en condiciones de laboratorio estándar con polvos catalizadores mezclados.
  • El contacto de partícula a partícula en las suspensiones redujo las velocidades de reacción aproximadamente 8 veces.

Conclusiones:

  • La polarización del catalizador puede ocurrir a través del contacto simple con sólidos conductores inertes, alterando las tasas de reacción intrínsecas.
  • Esta polarización inducida por contacto presenta una nueva estrategia para controlar la cinética de la reacción en fase líquida.
  • Los hallazgos tienen amplias implicaciones para la catálisis heterogénea donde las partículas del catalizador interactúan con materiales inertes.