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Related Concept Videos

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.
Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred to as...
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...
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...

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Multifunctional Hybrid Fe2O3-Au Nanoparticles for Efficient Plasmonic Heating
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Multifunctional materials for catalyst-specific heating and thermometry in tandem catalysis.

Marcos G Farpón1,2, Raquel Peláez1, Verónica Recio1

  • 1ITQ Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas (UPV-CSIC) Avenida de los Naranjos s/n Valencia 46022 Spain prieto@itq.upv.es.

Journal of Materials Chemistry. A
|November 28, 2023
PubMed
Summary

A new material integrates magnetic and thermal sensing for precise catalyst heating and temperature monitoring. This innovation solves temperature issues in tandem catalysis, demonstrated by direct propene production from ethene.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Catalysis

Background:

  • Tandem catalysis often faces challenges due to differing optimal temperatures for sequential reactions.
  • Controlling temperature precisely for individual catalysts in close proximity is difficult.

Purpose of the Study:

  • To develop a multifunctional material for simultaneous catalysis, magnetic manipulation, and contactless thermometry.
  • To enable catalyst-specific heating and temperature monitoring within a single reactor.
  • To overcome temperature incompatibilities in tandem catalytic processes.

Main Methods:

  • Design of a novel multifunctional material integrating catalytic, magnetic, and sensing properties.
  • Demonstration of catalyst-specific heating and thermometry using the material.
  • Application in a tandem catalysis system for direct propene production from ethene.

Main Results:

  • The material successfully enabled spatially distinct heating and thermometry for proximate solid catalysts.
  • Temperature incompatibilities were alleviated in the tandem catalysis of ethene to propene.
  • The system demonstrated efficient sequential olefin dimerization and metathesis reactions.

Conclusions:

  • Multifunctional materials can integrate catalytic and sensing functions for advanced reactor control.
  • This approach offers a solution for managing temperature gradients in complex catalytic systems.
  • The demonstrated technology holds promise for optimizing tandem catalytic processes.