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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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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 Alkenes: Asymmetric Catalytic Hydrogenation02:17

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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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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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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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Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

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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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Conformations of Ethane and Propane02:18

Conformations of Ethane and Propane

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In an organic molecule, free rotation about the carbon-carbon single bond results in energetically different conformers of the molecule. Due to this rotation, called the internal rotation, ethane has two major conformations — staggered and eclipsed.
Staggered conformation is a low energy and more stable conformation with the C-H bonds on the front carbon placed at 60°dihedral angles relative to the C-H bonds on the back carbon, leading to a reduced torsional strain. In staggered...
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Catalysis02:50

Catalysis

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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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A Toolkit to Enable Hydrocarbon Conversion in Aqueous Environments
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Site-defined Cu-O ensembles enable hydrogen-conserving light-driven ethane upgrading.

Qingqing Zhang1,2, Cong Liu1, Chang Xu1,2

  • 1Key Lab for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai, PR China.

Nature Communications
|March 10, 2026
PubMed
Summary
This summary is machine-generated.

This study presents a new light-driven method using copper-doped titanium dioxide for upgrading ethane to ethylene. Carbon dioxide co-feeding enhances catalyst stability and efficiency for this crucial chemical transformation.

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Area of Science:

  • Catalysis
  • Materials Science
  • Photochemistry

Background:

  • Upgrading light alkanes to olefins is challenging due to stable C-H bonds and overoxidation risks.
  • Developing efficient and selective catalytic systems for alkane functionalization remains a key industrial goal.

Purpose of the Study:

  • To develop a light-driven strategy for ethane dehydrogenation to ethylene using a novel catalyst.
  • To understand the mechanism of C-H activation and identify strategies to prevent catalyst deactivation.

Main Methods:

  • Utilized copper-doped titanium dioxide (TiO2) with atomically dispersed copper coordinated to bridging oxygen ([Cu-O] ensembles).
  • Investigated photocatalytic ethane dehydrogenation under UV irradiation (365 nm).
  • Employed co-feeding of carbon dioxide (CO2) to stabilize the catalyst.

Main Results:

  • Achieved a high ethylene production rate of 21.1 mmol g-1 h-1 with near-stoichiometric H2 evolution.
  • Demonstrated an apparent quantum efficiency of 6.1% for the photocatalytic process.
  • Identified that CO2 co-feeding effectively restores the active copper coordination and suppresses catalyst deactivation without hindering the main reaction.

Conclusions:

  • Established a site-defined, hydrogen-conserving photocatalytic route for alkane upgrading.
  • The [Cu-O] ensembles are crucial for selective C-H activation and olefin production.
  • This work provides a general blueprint for stable and selective C-H bond transformations using photocatalysis.