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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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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

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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...
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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.
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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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CeO2/Cu2O/Cu Tandem Interfaces for Efficient Water-Gas Shift Reaction Catalysis.

Zhengjian Li1, Mingzhi Wang1, Yanyan Jia2

  • 1School of Environment and Energy, State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou, Guangdong 510006, China.

ACS Applied Materials & Interfaces
|June 20, 2023
PubMed
Summary
This summary is machine-generated.

Developing advanced catalysts for the low-temperature water-gas shift reaction (LT-WGSR) is crucial. This study introduces an inverse copper-ceria (Cu@CeO2) catalyst, demonstrating significantly enhanced efficiency due to unique metal-oxide interfaces.

Keywords:
Cu+/Cu0 interfaceCu−CeO2 catalysthydrogen productionlow-temperature WGS reactiontandem interface

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Area of Science:

  • Catalysis
  • Materials Science
  • Chemical Engineering

Background:

  • Metal-oxide interfaces are critical for copper-based catalysts in the low-temperature water-gas shift reaction (LT-WGSR).
  • Achieving abundant, active, and stable Cu-metal oxide interfaces under LT-WGSR conditions presents a significant challenge.

Purpose of the Study:

  • To develop a highly efficient inverse copper-ceria (Cu@CeO2) catalyst for the LT-WGSR.
  • To elucidate the role of metal-oxide interfaces in catalyst performance.

Main Methods:

  • Synthesis of an inverse copper-ceria (Cu@CeO2) catalyst.
  • Quasi-in situ structural characterizations.
  • Reaction kinetics studies and density functional theory (DFT) calculations.

Main Results:

  • The Cu@CeO2 catalyst exhibited approximately three times higher LT-WGSR activity compared to a pristine Cu catalyst.
  • The catalyst featured abundant CeO2/Cu2O/Cu tandem interfaces.
  • Cu+/Cu0 interfaces were identified as active sites, with CeO2 facilitating H2O activation and interface stabilization.

Conclusions:

  • The CeO2/Cu2O/Cu tandem interface is key to regulating the activity and stability of Cu-based catalysts for LT-WGSR.
  • This work contributes to the design of improved catalysts for the low-temperature water-gas shift reaction.