Characteristics of Catalytic Reactions


(i) The catalyst remains unchanged in amount and chemical composition at the end of the reaction; it may, however, undergo considerable change in physical form. 
(ii) A small quantity of the catalyst is capable of producing the desired effect. 
(iii) The action of a catalyst is specific to a large extent. Thus, the decomposition of KCIO3 is catalyzed by MnO2 but not by platinum. 
(iv) The catalyst does not initiate a reaction; it merely accelerates the reaction that is already occurring. 
(v) A catalyst does not alter the final state of equilibrium in a reversible reaction. 

A certain minimum energy must be possessed by the reactants so that they may react and produce the products. This is called the activation energy (Ea) for the reaction. A catalyst is said to lower the activation energy and thus increase the rate of the reaction. 

                     activation-energy-for-reaction 

Thus, a catalyst increases the rate of a reaction by providing a pathway whose activation energy is lower than the activation energy of the uncatalysed reaction. 

 

Name
Email Id
Mobile

Exam
Target Year

Related Resources
Adsorption of Gases

Adsorption of Gases on Solids The extent of...

Applications of Colloids

Applications of Colloids Colloids play a very...

Preparation of Colloidal Solutions

Preparation Colloidal Solutions As mentioned...

Enzyme Catalysis

Enzyme Catalysis Enzymes are the biological...

Catalysis

Catalysis What is Catalysis? Catalysis is the...

Applications of Adsorption

Applications of Adsorption Some of the...

Catalysts in Industries

Catalysts in industries 1. Haber’s process...

Shape-Selective Catalysis by Zeolites

Shape-Selective Catalysis by Zeolites The...

Nature of Solid Catalysts

Nature of Solid Catalysts Solid catalysts may be...

Summary of Adsorption and Catalysis

Summary of Adsorption & Catalysis This section...

Solved Examples

Solved Examples on Surface Chemistry Question 1:...

Classification of Colloids

Classification of Colloids Classification of...

Types of Adsorption

Adsorption Topics Introduction to Adsorption |...

Emulsions

Emulsions The liquid-liquid colloidal dispersions...

Purification of Colloid

Purification of Colloidal Solutions Freshly...

Colloidal State

Colloidal State An ordinary solution is composed...

Adsorption

Adsorption What is Adsorption? Adsporption is the...

Properties of Colloids

Properties of Colloids General Physical Properties...

Adsorption from Solution

Adsorption Topics Introduction to Adsorption |...

Types of Catalysts

Types of Catalysts (i) Positive catalysis: The...