Heterogeneous catalysis

ASSIGNMENT TOPIC:
INTRODUCTION TO HETEROGENEOUS
CATALYSIS
SUBMITTED TO :
DR .NAILA ZUBAIR
SUBMITTED FROM :
PALWASHA SABATAIN
SUBJECT :
SURFACE CHEMISTRY


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, HETEROGENEOUS CATALYSIS


Table of contents .
1. Introduction to catalysis
2. Types of catalysis
3 .Adsorption theory of heterogeneous catalysis

4. Mechanism of heterogeneous catalysis

5 .Specific examples

6 .Importanance



HETEROGENEOUS CATALYSIS :
A catalyst is a substance that may be ions, salt, metal, or inorganic compound, whatever that influences
the rate of a chemical reaction, but itself remains unchanged chemically at the end of the chemical
reaction.

CRITERIA FOR CATALYSIS :
The criteria or characteristics of catalysis/catalyst are listed below:

 A small amount of catalyst is enough to catalyse the rate of reaction.
 The catalyst remains unchanged in amount and composition at the end of a chemical reaction.
 A catalyst does not initiate a chemical reaction.
 A catalyst doest not affect equilibrium and catalyst does not initiate a chemical reaction.
 A catalyst doest not affect equilibrium condition.
 The action of catalyst is universal and specific.
 The activity of catalyst is enhanced by the presence of a substance called promoter.
 A catalyst has an optimum temperature at which the action of the catalyst is maximum.



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