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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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...

Reduction of Alkenes: Catalytic Hydrogenation

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...

Catalysis

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.

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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.

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Related Experiment Video

Updated: Jan 5, 2026

Hydrogen Production and Utilization in a Membrane Reactor

Hydrogen Production and Utilization in a Membrane Reactor

Published on: March 10, 2023

Efficient Hydrogen Production from Methanol Using a Single-Site Pt₁/CeO₂ Catalyst.

Lu-Ning Chen¹, Kai-Peng Hou², Yi-Sheng Liu

¹State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, and Department of Chemistry, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China.

Journal of the American Chemical Society

|October 25, 2019

Summary

Single-site platinum on cerium oxide catalysts significantly boost hydrogen generation from methanol. This breakthrough offers a 40-800x efficiency increase over nanoparticle catalysts for sustainable energy storage.

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Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether

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Hydrogen Production and Utilization in a Membrane Reactor

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Solar-Driven Electrochemical Green Fuel Production from CO2 and Water Using Ti3C2Tx MXene-Supported CuZn and NiCo Catalysts

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Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether

Published on: August 17, 2019

Area of Science:

Catalysis
Materials Science
Sustainable Energy

Background:

Hydrogen is a promising energy carrier but faces storage and transportation challenges due to low volumetric energy density.
Liquid organic hydrogen carriers (LOHCs) offer a viable solution by enabling in situ hydrogen generation.
Developing efficient catalysts is crucial for cost-effective and high-rate hydrogen storage and release.

Purpose of the Study:

To investigate the efficacy of single-site catalysts for hydrogen generation from methanol.
To compare the performance of single-site Pt1/CeO2 with traditional nanoparticle catalysts.
To explore advanced catalytic materials for efficient sustainable energy storage.

Main Methods:

Utilized methanol as a liquid organic hydrogen carrier.
Employed a single-site Pt1/CeO2 catalyst for in situ hydrogen generation.
Compared catalytic performance against 2.5 nm and 7.0 nm Pt/CeO2 nanoparticle catalysts.

Main Results:

The single-site Pt1/CeO2 catalyst demonstrated significantly higher hydrogen generation efficiency.
Efficiency was 40 times greater than the 2.5 nm Pt/CeO2 sample.
Efficiency was 800 times greater than the 7.0 nm Pt/CeO2 sample.

Conclusions:

Single-site catalysts offer superior performance for hydrogen generation compared to nanoparticle catalysts.
This study validates the potential of single-site catalysts for efficient and sustainable energy storage.
The findings provide a foundation for designing next-generation catalysts for hydrogen applications.