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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.

Catalysis

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...

Heterogeneous Catalysis

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

Acid-Catalyzed Hydration of Alkenes

Acid-Catalyzed Hydration of Alkenes

Alkenes react with water in the presence of an acid to form an alcohol. In the absence of acid, hydration of alkenes does not occur at a significant rate, and the acid is not consumed in the reaction. Therefore, alkene hydration is an acid-catalyzed reaction.

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.

Factors Influencing the Rate of Chemical Reactions

Factors Influencing the Rate of Chemical Reactions

A variety of factors influence the rate of chemical reactions. For a chemical reaction to happen, atoms must collide with enough energy to overcome the repulsion between their electrons. This energy is called activation energy. Factors influencing the rate of reaction either lower the activation energy or increase the likelihood of a successful collision.
Concentration and Pressure:
The more particles present within a given space, the more likely those particles are to bump into one another.

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Related Experiment Video

Updated: May 13, 2026

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

Published on: August 23, 2018

Why does water accelerate organic reactions under heterogeneous condition?

Arpan Manna¹, Anil Kumar

¹Physical and Materials Chemistry Division, National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India.

The Journal of Physical Chemistry. A

|March 6, 2013

Summary

The oil-water interface guides organic reactions in water, proving its unique role in water-mediated synthesis. Surface water's hydrogen-bonding ability is critical for these on-water reactions.

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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

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Last Updated: May 13, 2026

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

Published on: August 23, 2018

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Published on: January 16, 2016

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

Area of Science:

Physical Organic Chemistry
Supramolecular Chemistry
Interface Science

Background:

Water-mediated organic reactions are a growing field, but the specific role of the oil-water interface remains unclear.
Understanding interfacial phenomena is key to developing efficient and sustainable synthetic methodologies.

Purpose of the Study:

To provide kinetic and thermodynamic evidence for the oil-water interface's role in guiding on-water organic reaction mechanisms.
To demonstrate the interface's unique efficacy in distinguishing on-water reactions from other water-mediated processes.
To elucidate the influence of interfacial water structure and hydrogen-bonding on reaction pathways.

Main Methods:

Exhaustive kinetic analysis of on-water organic reactions.
In situ experimental methods to control and characterize the oil-water interface structure.
Sensitive techniques to probe preferential solvation at the water surface.
Temperature-dependent analyses to determine enthalpic and entropic contributions.

Main Results:

Convincing kinetic evidence for the oil-water interface guiding reaction mechanisms.
Demonstration of the interface's indispensable role in making on-water reactions unique.
Identification of preferential solvation of polarizable ions at the water surface.
Establishment of the critical role of surface water hydrogen-bonding ability in reaction mechanisms.

Conclusions:

The oil-water interface is a critical determinant in the mechanism of on-water organic reactions.
Interfacial water exhibits unique properties, including preferential solvation and specific hydrogen-bonding capabilities.
These findings have significant implications for understanding reactant-water interactions in heterogeneous reaction systems.