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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 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...

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 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.

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...

Regioselectivity and Stereochemistry of Hydroboration

Regioselectivity and Stereochemistry of Hydroboration

A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...

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Related Experiment Video

Updated: Sep 11, 2025

A Toolkit to Enable Hydrocarbon Conversion in Aqueous Environments

A Toolkit to Enable Hydrocarbon Conversion in Aqueous Environments

Published on: October 2, 2012

A Practical Guide to Heterogeneous Catalysis in Hydrocarbon Transformations.

Kelvin A Sanoja-Lopez¹, Alina M Balu², Héctor de Paz Carmona³

¹CEDS, Campus, Univ ECOTEC, Km 13.5 Samborondon, Samborondon, EC092302, Ecuador.

Chemistry, an Asian Journal

|August 13, 2025

Summary

This guide details heterogeneous catalysis for converting biomass into valuable products. It covers molecular principles, reactor choices, and analytical methods for lab-scale research and industrial applications.

Keywords:

Catalysis Guide Hydrocarbons Researcher Student

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Area of Science:

Catalysis
Chemical Engineering
Materials Science

Background:

Heterogeneous catalysis is crucial for converting biomass-derived compounds.
Understanding molecular foundations and catalyst properties is key for process design.
Bridging lab-scale research with industrial applications requires robust methodologies.

Purpose of the Study:

To provide a comprehensive guide to heterogeneous catalysis for biomass conversion.
To establish a methodological basis for designing catalytic processes.
To support researchers in developing experimental projects and in-depth studies.

Main Methods:

Analysis of molecular foundations, catalyst selection criteria, and experimental setups.
Investigation of key catalytic mechanisms (cracking, isomerization, coupling, hydrogenation, oxidation).
Comparison of batch and continuous flow reactors, mass balances, and advanced analytical techniques.

Main Results:

Demonstrated strategic relevance in petroleum refining, biofuel production, plastic waste valorization, and renewable fuel synthesis.
Highlighted improvements in conversion, selectivity, and stability using bifunctional catalysts, mesoporous materials, and hybrid systems.
Emphasized the importance of active site nature (acidic, basic, metallic, redox) for activity and selectivity.

Conclusions:

Heterogeneous catalysis offers a viable pathway for valorizing biomass into high-value products.
Methodological rigor in experimental design and analysis is essential for successful process development.
This guide serves as a practical starting point for researchers in the field.