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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 Benzene to Cyclohexane: Catalytic Hydrogenation

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

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...

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...

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.

Reactions at the Benzylic Position: Oxidation and Reduction

Reactions at the Benzylic Position: Oxidation and Reduction

The benzylic position describes the position of a carbon atom attached directly to a benzene ring. Benzene by itself does not undergo oxidation. In contrast, the benzylic carbon is quite reactive in the presence of strong oxidizing agents such as KMnO4 or H2CrO4. Therefore, alkylbenzenes are readily oxidized to benzoic acid, irrespective of the type of alkyl groups.

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Related Experiment Video

Updated: Sep 14, 2025

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Published on: June 24, 2022

Heterogeneous Catalysts for Toluene Oxidation.

Zhen Su^1,2, Hua Long¹, Rui-Rui Zhao¹

¹Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan, 430079, China.

Chemistry, an Asian Journal

|July 21, 2025

Summary

This summary is machine-generated.

Heterogeneous catalysts offer a sustainable route for activating toluene's robust C-H bonds under mild conditions. This review covers thermocatalysts, photocatalysts, and electrocatalysts for efficient toluene oxidation into valuable chemicals.

Keywords:

C‐H bond activation Heterogeneous catalysis Heterogeneous photocatalysis Selective oxidation Single‐atom catalysis

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Area of Science:

Heterogeneous catalysis
C-H bond activation
Oxidation chemistry

Background:

Selective activation of C(sp³)-H bonds in toluene for producing oxygenated chemicals is challenging due to bond robustness.
Conventional methods require harsh conditions and toxic reagents.
Heterogeneous catalysis, particularly photocatalysis, offers a promising alternative under mild conditions.

Purpose of the Study:

To review the advancements in heterogeneous thermocatalysts, photocatalysts, and electrocatalysts for toluene oxidation.
To analyze catalyst modification strategies and reaction mechanisms.
To provide perspectives on future research directions.

Main Methods:

Comprehensive literature review of heterogeneous catalytic systems for toluene oxidation.
Analysis of catalysts based on conversion, selectivity, recyclability, and reaction conditions.
Examination of catalyst modification strategies and mechanistic insights.

Main Results:

Summarizes various heterogeneous catalytic systems (thermo-, photo-, electrocatalysts) for toluene oxidation.
Evaluates catalyst performance based on key metrics like efficiency, stability, and scalability.
Highlights catalyst modification techniques to enhance performance.

Conclusions:

Heterogeneous catalysis presents a viable and sustainable approach for toluene oxidation.
Further research is needed to overcome challenges and develop high-performance catalytic systems.
Focus on mild reaction conditions, catalyst design, and mechanistic understanding is crucial for industrial applications.