Video Experimental Relacionado

Updated: Jun 15, 2025

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

Sitio activo en protozeolita para la deshidrogenación de propano

Jialiang Li^1,2, Qiang Zhang^1,2, Guangyuan He³

¹State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China.

Journal of the American Chemical Society

|August 21, 2024

Resumen

La protozeolita amorfa apoya los catalizadores estabilizadores de platino-estaño (PtSn) para la deshidrogenación del propano (PDH), logrando una alta conversión y selectividad. Este nuevo enfoque mejora la estabilidad y el rendimiento del catalizador utilizando un método rentable.

Área de la Ciencia:

Ciencias de los materiales
Catálisis
Ingeniería Química

Sus antecedentes:

Las zeolitas son soportes efectivos para los catalizadores en la deshidrogenación del propano (PDH).
Los catalizadores metálicos en soportes pueden sinterizarse y perder su estabilidad durante los procesos industriales.
Los métodos de impregnación para la incorporación de metal pueden ser limitados.

Objetivo del estudio:

Desarrollar un nuevo material de soporte para estabilizar catalizadores metálicos subnanométricos.
Mejorar la estabilidad y el rendimiento de los catalizadores de platino-lata (PtSn) para la PDH.
Para utilizar protozeolita amorfa (PZ) con química de silanol sintonizable para la estabilización del catalizador.

Principales métodos:

Coimpregnación de PtSn en la protozeolita amorfa (PZ).
Caracterización mediante espectroscopia de absorción de rayos X (XAS), espectroscopia de fotoelectrones de rayos X (XPS) y DRIFTS in situ.
Cálculos de la teoría funcional de la densidad (DFT).

Principales resultados:

Formación de especies activas Ptδ+-O-Sn muy dispersas en PtSn/PZ.
Se obtiene una alta conversión de propano (45,4%) y selectividad de propileno (99%) a 550 °C.
Demostrado rendimiento catalítico de alto nivel con altos coeficientes de velocidad aparente.

Conclusiones:

La protozeolita amorfa es un apoyo prometedor para estabilizar catalizadores metálicos dispersos atómicamente.
La densidad de silanol en el soporte determina el estado químico de las especies metálicas.
Este trabajo ofrece una estrategia general para la estabilización del catalizador y la adaptación del estado del metal a través de la ingeniería del silanol.

Más Videos Relacionados

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

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

Videos de Conceptos Relacionados

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 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...

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.

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.