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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...
Catalysis02:50

Catalysis

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.
Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
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...
Catalytically Perfect Enzymes01:07

Catalytically Perfect Enzymes

The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...

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Related Experiment Video

Updated: May 27, 2026

Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks (MOFs)
08:25

Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks (MOFs)

Published on: January 17, 2020

Tight bifunctional hierarchical catalyst.

Karen T Højholt1, Peter N R Vennestrøm, Ramchandra Tiruvalam

  • 1Haldor Topsøe A/S, Nymøllevej 55, DK-2800 Lyngby, Denmark.

Chemical Communications (Cambridge, England)
|November 4, 2011
PubMed
Summary

A novel bifunctional catalyst was created by anchoring cobalt-molybdenum (CoMo) clusters onto ZSM-5 zeolites. This new catalyst shows enhanced activity for hydrodesulfurization (HDS) and hydrocracking reactions.

Area of Science:

  • Catalysis
  • Materials Science
  • Chemical Engineering

Background:

  • Developing efficient bifunctional catalysts is crucial for simultaneous hydrodesulfurization (HDS) and hydrocracking.
  • Hierarchical zeolites offer unique structural advantages for catalytic applications.
  • Anchoring metal clusters provides a strategy for precise catalyst design.

Purpose of the Study:

  • To develop a novel bifunctional catalyst by anchoring cobalt-molybdenum (CoMo) clusters on hierarchical ZSM-5 zeolites.
  • To investigate the simultaneous catalytic performance in HDS and hydrocracking.
  • To compare the efficacy of the anchored catalyst with traditional impregnated counterparts.

Main Methods:

  • Synthesis of hierarchical ZSM-5 zeolites.
  • Anchoring of CoMo clusters onto the zeolite support.

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HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
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HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin

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HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
11:15

HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin

Published on: July 23, 2016

  • Characterization of the catalyst's structure and properties.
  • Evaluation of catalytic activity in HDS and hydrocracking reactions.

    • Main Results:

    • A new concept for preparing tightly anchored CoMo clusters on hierarchical ZSM-5 zeolites was successfully implemented.
    • The prepared bifunctional catalyst demonstrated significantly improved activity in HDS catalysis.
    • Performance was superior compared to a catalyst prepared via impregnation.

    Conclusions:

    • The anchoring strategy offers an effective route to enhance bifunctional catalyst performance.
    • Hierarchical ZSM-5 zeolites are suitable supports for anchoring CoMo clusters for HDS and hydrocracking.
    • This approach presents a promising avenue for advanced catalytic material development.