Surface Chemistry and Catalysis
Introduction to surface chemistry and catalysis:
Definition of surface chemistry:
Adsorption is a surface chemistry event. Adsorption is observed at the surface of the solution. Adsorption is an event of application of matter on the surface of a liquid or solid. The method of adsorption of gases by solids is a general event of surface chemistry.
Definition of catalyst:
In chemistry a catalyst is a substance which changes the rate of a chemical reaction, not including it undergoing any chemical change and the event is known as catalyst.
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General Characteristics of Catalytic Reactions:
General characteristics of catalytic reactions:
The following characteristics are generally common to most of the catalytic reactions.
The catalyst remains unmovable in mass and in chemical composition at the end of the reaction.
Only a little quantity of catalyst is usually needed.
A catalyst cannot create a reaction. The function of a catalyst is only to change the speed of the reaction which is already occurring at a particular rate.
A catalyst does not change the location of equilibrium in a reversible result.
The catalyst is usually specified in its action.
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Types of catalytic reactions:
In chemistry catalytic reactions are classified into two types.
Homogeneous catalysis
Heterogeneous catalysis
Types of Catalysts:
Types of catalysts:
The catalysts divided into various types according to their behavior and pattern of action.
Positive catalyst
Negative catalyst
Auto catalyst
Induced catalyst
1. Positive catalyst:
A catalyst which enhances the speed of the reaction is called positive catalyst and the event is known as positive catalysis.
2. Negative Catalyst:
Negative Catalyst is definite substances which, when added to the reaction mixture, retard the reaction rate instead of increasing it. These are called negative catalysts or inhibitors and the event is known as negative catalysis.
3. Auto catalyst:
In certain reactions, it is observed that one of the products formed during the reaction acts as a catalyst for that reaction. This type of catalyst is called auto catalyst and the event is known as auto catalysis.
4. Induced Catalyst:
When one reactant influences the speed of other reaction, which does not happen under ordinary conditions, this process is known as induced catalysis. Sodium arsenite element is not oxidised by air. If, however, air is travelled through a mixture of the solution of sodium arsenite and sodium sulphite, both of them go through simultaneous oxidation. Thus sulphite has induced the arsenite and hence is called induced catalyst.
Definition of surface chemistry:
Adsorption is a surface chemistry event. Adsorption is observed at the surface of the solution. Adsorption is an event of application of matter on the surface of a liquid or solid. The method of adsorption of gases by solids is a general event of surface chemistry.
Definition of catalyst:
In chemistry a catalyst is a substance which changes the rate of a chemical reaction, not including it undergoing any chemical change and the event is known as catalyst.
Please express your views of this topic Charles Law Problems by commenting on blog.
General Characteristics of Catalytic Reactions:
General characteristics of catalytic reactions:
The following characteristics are generally common to most of the catalytic reactions.
The catalyst remains unmovable in mass and in chemical composition at the end of the reaction.
Only a little quantity of catalyst is usually needed.
A catalyst cannot create a reaction. The function of a catalyst is only to change the speed of the reaction which is already occurring at a particular rate.
A catalyst does not change the location of equilibrium in a reversible result.
The catalyst is usually specified in its action.
Is this topic Affinity Chromatography hard for you? Watch out for my coming posts.
Types of catalytic reactions:
In chemistry catalytic reactions are classified into two types.
Homogeneous catalysis
Heterogeneous catalysis
Types of Catalysts:
Types of catalysts:
The catalysts divided into various types according to their behavior and pattern of action.
Positive catalyst
Negative catalyst
Auto catalyst
Induced catalyst
1. Positive catalyst:
A catalyst which enhances the speed of the reaction is called positive catalyst and the event is known as positive catalysis.
2. Negative Catalyst:
Negative Catalyst is definite substances which, when added to the reaction mixture, retard the reaction rate instead of increasing it. These are called negative catalysts or inhibitors and the event is known as negative catalysis.
3. Auto catalyst:
In certain reactions, it is observed that one of the products formed during the reaction acts as a catalyst for that reaction. This type of catalyst is called auto catalyst and the event is known as auto catalysis.
4. Induced Catalyst:
When one reactant influences the speed of other reaction, which does not happen under ordinary conditions, this process is known as induced catalysis. Sodium arsenite element is not oxidised by air. If, however, air is travelled through a mixture of the solution of sodium arsenite and sodium sulphite, both of them go through simultaneous oxidation. Thus sulphite has induced the arsenite and hence is called induced catalyst.