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Related Concept Videos

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The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
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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.
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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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Updated: May 27, 2025

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Computational Insight into Methane-Methanol Coupling and Aromatization over Metal-Modified ZSM-5: From Mechanism to

Mengnan Sun1, Xiaowa Nie1, Xinwei Zhang2

  • 1State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.

Chem & Bio Engineering
|February 20, 2025
PubMed
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Molybdenum-modified ZSM-5 zeolite catalyzes methane dehydroaromatization. This study reveals methane-methanol coupling is C-C bond formation limited, while aromatization depends on Brønsted acid site regeneration over Mo/ZSM-5.

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Area of Science:

  • Catalysis
  • Materials Science
  • Chemical Engineering

Background:

  • Methane dehydroaromatization (MDA) is crucial for converting methane to aromatics.
  • Molybdenum-modified ZSM-5 (Mo/ZSM-5) shows promise for MDA.
  • Methanol co-feeding can enhance MDA, but mechanisms require clarification.

Purpose of the Study:

  • Investigate the mechanism of methane-methanol coupling and aromatization over Mo/ZSM-5.
  • Identify kinetic and selectivity controlling factors.
  • Explore strategies for improving catalytic performance.

Main Methods:

  • Periodic density functional theory (DFT) calculations were employed.
  • Analyzed reaction pathways and energy barriers.
  • Evaluated the effect of co-adsorbed water and bimetallic modifications.

Main Results:

  • Methane-methanol coupling to light olefins is C-C coupling limited.
  • Aromatization of olefins is kinetically controlled by Brønsted acid site regeneration.
  • Co-adsorbed water slightly hinders ethylene aromatization to benzene.
  • Bimetallic Mo/ZSM-5 catalysts (with Co, Ni, or Nb) enhance C-C coupling.

Conclusions:

  • The study elucidates the detailed mechanism of methane-methanol coupling and aromatization over Mo/ZSM-5.
  • Brønsted acid site regeneration is critical for aromatization.
  • Bimetallic catalysts offer improved performance for methane-methanol coupling reactions.