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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.

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Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods

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Photocatalytic H₂ Evolution Coupled with Furfuralcohol Oxidation over Pt-Modified ZnCdS Solid Solution.

Zhongliao Wang¹, Linxi Wang², Bei Cheng¹

¹State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China.

|December 20, 2021

Summary

Platinum nanoclusters on ZnCdS solid solutions boost photocatalytic hydrogen production and furfuralcohol oxidation. This advancement addresses charge recombination and enhances efficiency for sustainable energy and chemical synthesis.

Keywords:

H 2 production furfuralcohol photocatalysis selective oxidation solid solutions

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Area of Science:

Materials Science
Photocatalysis
Green Chemistry

Background:

Photocatalytic hydrogen (H₂) production coupled with organic synthesis is crucial for sustainable energy and chemical production.
Current photocatalysts suffer from significant charge recombination and slow H₂ evolution rates.
Developing efficient and stable photocatalysts is essential for practical applications.

Purpose of the Study:

To fabricate a novel photocatalyst for enhanced H₂ production and selective organic synthesis.
To investigate the role of platinum (Pt) nanoclusters and ZnCdS solid solutions in improving photocatalytic performance.
To elucidate the underlying photocatalytic mechanisms through experimental and theoretical studies.

Main Methods:

Synthesis of Pt nanocluster-modified ZnCdS solid solution.
Photocatalytic H₂ production rate measurements.
Selective oxidation of furfuralcohol.
In situ characterizations and theoretical calculations to study reaction mechanisms.

Main Results:

The Pt-ZnCdS photocatalyst exhibited a significantly enhanced H₂ production rate (1045 µmol g^-1 h^-1), outperforming CdS and ZnS.
Achieved 71% conversion of furfuralcohol to furfural with 89% selectivity under light irradiation.
Internal electric field and Schottky junction effectively improved charge separation and H₂ evolution kinetics.

Conclusions:

Pt nanocluster modification of ZnCdS solid solutions is a highly effective strategy for boosting photocatalytic H₂ production and organic synthesis.
The developed photocatalyst demonstrates potential for clean energy generation and value-added chemical production.
Understanding the mechanism provides insights for designing advanced photocatalytic systems.