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Related Concept Videos

Catalysis02:50

Catalysis

29.9K
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.
29.9K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.8K
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...
3.8K
Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

13.8K
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...
13.8K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

8.8K
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.
8.8K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

12.4K
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.
12.4K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.8K
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.
2.8K

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Related Experiment Video

Updated: Dec 24, 2025

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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A highly active Rh1/CeO2 single-atom catalyst for low-temperature CO oxidation.

Bing Han1, Tianbo Li, Junying Zhang

  • 1CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China. btqiao@dicp.ac.cn taozhang@dicp.ac.cn.

Chemical Communications (Cambridge, England)
|April 15, 2020
PubMed
Summary

A novel rhodium single-atom catalyst on cerium dioxide demonstrates high activity for carbon monoxide oxidation. This advanced catalyst avoids carbon monoxide poisoning at low temperatures, offering a sustainable alternative for three-way catalysts.

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Area of Science:

  • Catalysis
  • Materials Science
  • Environmental Chemistry

Background:

  • Noble metal catalysts are crucial for three-way catalysts but are expensive.
  • Developing efficient and cost-effective alternatives is essential for sustainable automotive emissions control.

Purpose of the Study:

  • To investigate the catalytic activity of rhodium single-atom catalysts supported on cerium dioxide for carbon monoxide oxidation.
  • To explore the potential of this single-atom catalyst as a multifunctional alternative to traditional noble metals.

Main Methods:

  • Synthesis of Rh1/CeO2 single-atom catalyst.
  • Evaluation of catalytic performance for CO oxidation.
  • Mechanistic studies using the Mars-van Krevelen pathway.

Main Results:

  • The Rh1/CeO2 single-atom catalyst exhibits high activity for CO oxidation.
  • The catalyst operates effectively via the Mars-van Krevelen mechanism.
  • CO poisoning is avoided at low temperatures, indicating enhanced stability and efficiency.

Conclusions:

  • Single-atom rhodium on cerium dioxide is a highly active catalyst for CO oxidation.
  • This catalyst offers a promising, cost-effective, and sustainable alternative for three-way catalyst applications.
  • The Mars-van Krevelen mechanism is key to the catalyst's low-temperature performance and resistance to CO poisoning.