Video Experimental Relacionado

Updated: Jul 16, 2025

Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation

Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation

Published on: July 18, 2017

Catalizador de Zn coordinadamente insaturado de alta densidad para la deshidrogenación eficiente de alcanos

Linlin Wang¹, Hui Wang^2,3,4, Renfei Cheng¹

¹Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China.

Journal of the American Chemical Society

|September 13, 2023

Resumen

Un nuevo catalizador de alta densidad coordinadamente insaturado de zinc (Zn_cus) deshidrogena eficientemente el etilbenceno a estireno. Este catalizador de metales no nobles muestra un excelente rendimiento y regeneración, avanzando en la investigación de la catálisis.

Área de la Ciencia:

Catálisis
Ciencias de los materiales
Ingeniería Química

Sus antecedentes:

El desarrollo de catalizadores de metales no nobles para la deshidrogenación de alcanos es crucial para las aplicaciones industriales.
La comprensión de los mecanismos catalíticos es clave para diseñar catalizadores eficientes y estables.

Objetivo del estudio:

Informar sobre un catalizador de alta densidad de catión Zn coordinadamente insaturado (Zn_cus) para la deshidrogenación directa del etilbenceno (EB).
Investigar el rendimiento catalítico y el mecanismo del catalizador desarrollado.

Principales métodos:

Síntesis de un catalizador de alta densidad de Zn_cus en un soporte de silicato de zinc (HD-Zn_cus@ZS).
Evaluación del rendimiento catalítico en la conversión de etilbenceno en estireno (EB a ST).
Cálculos de la teoría funcional de la densidad (DFT) para aclarar la vía de reacción y el mecanismo del sitio activo.

Principales resultados:

El catalizador HD-Zn_cus@ZS logró aproximadamente el 40% de conversión EB inicial y más del 98% de selectividad ST.
El catalizador mostró una excelente capacidad de regeneración, lo que indica una alta estabilidad de los sitios activos.
Los cálculos de DFT confirmaron que los sitios Zn_cus activan efectivamente el enlace C-H del etilbenceno.

Conclusiones:

Los cationes de Zn coordinadamente insaturados de alta densidad son sitios activos efectivos para la deshidrogenación del etilbenceno.
El catalizador desarrollado ofrece una alternativa prometedora de metales no nobles para la producción de estireno.
Este trabajo proporciona una base para el diseño de catalizadores prácticos de metales no nobles basados en sitios Zn_cus.

Más Videos Relacionados

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

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

Published on: June 24, 2022

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

Videos de Conceptos Relacionados

Reduction of Alkenes: Catalytic Hydrogenation

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...

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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 Alkynes to cis-Alkenes: Catalytic Hydrogenation

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.

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...

Ziegler–Natta Chain-Growth Polymerization: Overview

Ziegler–Natta Chain-Growth Polymerization: Overview

Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...

Catalysis

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.