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Related Concept Videos

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...
Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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 surface of...
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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.
Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.

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Engineering Metal-Vacancy Synergistic Centers in Mo@MoO2 for Robust CO2 Hydrogenation.

Xiaoting Gong1, Yulong Chen1, Li Zhu1

  • 1Laboratory of Green & Smart Chemical Engineering in Universities of Shandong, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, Shandong 266042, China.

Inorganic Chemistry
|June 26, 2026
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Summary

A novel Mo@MoO2 catalyst with metallic molybdenum and oxygen vacancies (Mo-OVs) shows high activity and stability for the reverse water-gas shift reaction. This design strategy enhances CO2 conversion through synergistic dual-site interactions.

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Area of Science:

  • Materials Science
  • Catalysis
  • Chemical Engineering

Background:

  • Synergistic interactions between metals and oxygen vacancies (OVs) are crucial for efficient catalysis in multiphase systems.
  • The reverse water-gas shift (RWGS) reaction is vital for CO2 utilization and chemical synthesis.

Purpose of the Study:

  • To develop a highly active and stable catalyst for the RWGS reaction.
  • To investigate the role of metal-oxygen vacancy interactions in catalytic performance.

Main Methods:

  • One-step hydrogen thermal treatment to synthesize a Mo@MoO2 catalyst.
  • Characterization techniques (e.g., XRD, TEM, XPS) to analyze catalyst structure and composition.
  • Theoretical calculations (e.g., DFT) to understand active site mechanisms.

Main Results:

  • The Mo@MoO2 catalyst achieved 50.2% CO2 conversion at 600 °C in the RWGS reaction.
  • The catalyst exhibited excellent stability, maintaining activity for 160 hours without deactivation.
  • Mo-OV active sites were confirmed to enhance catalytic activity through synergistic dual-site interactions.

Conclusions:

  • Designing synergistic active sites composed of metal species and oxygen vacancies is a promising strategy for developing highly efficient RWGS catalysts.
  • The Mo@MoO2 catalyst demonstrates significant potential for industrial applications in CO2 conversion.