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Related Concept Videos

Catalysis02:50

Catalysis

26.6K
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 Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

11.8K
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...
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

7.6K
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.
7.6K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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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...
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

9.8K
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.
9.8K
Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
4.7K

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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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Core-shell Ni/SiO2@ZrO2 catalyst for highly selective CO2 conversion accompanied by enhancing reaction stability.

Sha Cui1,2,3, Zhe Wang1, Honggang Zhao1

  • 1School of Petrochemical Engineering & Environment, Zhejiang Ocean University, Zhoushan, 316022, China.

Heliyon
|December 17, 2024
PubMed
Summary

A novel core-shell catalyst, Ni/SiO2@ZrO2, enhances carbon dioxide conversion via the RWGS reaction. This stable catalyst achieves high selectivity for CO production, overcoming challenges like methanation and sintering.

Keywords:
CO2 RWGSCore-shell structureIn-situ hydrothermal synthesisZrO2

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

  • Catalysis
  • Materials Science
  • Chemical Engineering

Background:

  • The Reverse Water-Gas Shift (RWGS) reaction is crucial for CO2 conversion but faces challenges like methanation and catalyst sintering.
  • Developing highly selective and stable catalysts is essential for efficient CO2 utilization.

Purpose of the Study:

  • To design and synthesize a novel core-shell catalyst for improved CO2 RWGS performance.
  • To investigate the catalytic activity, selectivity, and stability of the developed catalyst.

Main Methods:

  • Core-shell Ni/SiO2@ZrO2 catalyst synthesized using wet impregnation and in-situ hydrothermal methods.
  • Characterization of catalyst properties including metal-support interaction, oxygen vacancies, and CO2 adsorption.
  • Evaluation of catalytic performance in the CO2 RWGS reaction under varying gas hourly space velocities (GHSV).

Main Results:

  • The optimized Ni/SiO2@4ZrO2 catalyst demonstrated enhanced metal-support interaction, abundant oxygen vacancies, and suitable CO2 adsorption sites.
  • Achieved significant hydrogenation activity and superior selectivity towards CO compared to the reference Ni/SiO2 catalyst.
  • Exhibited excellent catalytic stability with 100% CO selectivity at 600°C for 72 hours.

Conclusions:

  • The core-shell Ni/SiO2@ZrO2 catalyst offers a promising strategy for efficient and stable CO2 conversion via the RWGS reaction.
  • The catalyst design overcomes key challenges, paving the way for practical applications in CO2 utilization.
  • This approach is potentially applicable to other multiphase reaction systems.