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Related Concept Videos

Catalysis02:50

Catalysis

30.0K
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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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

8.9K
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.
8.9K
Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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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.
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...
13.9K

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Inverse In2O3-x/Ni interfaces via Ni3InC0.5 surface reconstruction for efficient CO2 hydrogenation to methanol.

Jiyi Chen1,2,3, Tiantian Xiao1,3, Bingqing Yao4

  • 1Key Laboratory for Green Chemical Technology of Ministry of Education, Collaborative Innovation Center of Chemical Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China.

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Surface reconstruction of Ni3InC0.5 nanoparticles forms defective In2O3-x overlayers and inverse interfaces. This synergy enhances CO2 hydrogenation to methanol, outperforming commercial catalysts.

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Area of Science:

  • Materials Science
  • Catalysis
  • Chemical Engineering

Background:

  • Catalyst surface reconstruction is vital for creating active sites and improving catalytic performance.
  • Understanding dynamic structural changes under reaction conditions is key to catalyst design.

Purpose of the Study:

  • To investigate the surface reconstruction of supported Ni3InC0.5 nanoparticles during CO2 hydrogenation.
  • To elucidate the role of reconstructed interfaces in enhancing methanol synthesis from CO2.

Main Methods:

  • Synthesis of Ni3InC0.5 nanoparticles supported on LDH.
  • Characterization of catalyst structure and surface properties.
  • In-situ/operando studies of CO2 hydrogenation.

Main Results:

  • CO2-induced selective surface oxidation led to defective In2O3-x overlayers and inverse In2O3-x/Ni interfaces.
  • The synergistic effect of these interfaces facilitated CO2 adsorption, activation, and intermediate hydrogenation.
  • Optimized LDH-NiInCAl catalyst achieved 19% CO2 conversion and 65% methanol selectivity.
  • High methanol space-time yield of 508.4 mg/gcat/h, outperforming commercial Cu/ZnO/Al2O3.

Conclusions:

  • Surface reconstruction of Ni3InC0.5 is a viable strategy for enhancing CO2 hydrogenation to methanol.
  • The defective In2O3-x overlayers and inverse interfaces play a crucial role in the catalytic activity.
  • This study provides insights into the dynamic structure-activity relationship for CO2 conversion.