SURFACE

CHEMISTRY MODULE-4

CLASSIFICATION OF CATALYSIS

Characteristics of a catalyst

• Remains chemically unchanged at the end of reaction.

• Small quantity is required to bring about large amount of change.

• No effect on equilibrium position of a reversible reaction and affects rate of backward and forward reactions to same extent.

• Catalyst cannot start a reaction, but some reactions appear to occur in presence of it.

• The action of catalyst is extremely specific.

• Catalysts can act either as promotors or as poisons.

Reactants and catalyst are in

same phase.

Reactants and catalyst in

different phases.

Enzymes act as catalyst.

HOMOGENEOUS

CATALYST/CATALYSIS

HETROGENEOUS

CATALYST/CATALYSIS

BIO CHEMICAL

CATALYST/ENZYME

CATALYSIS

HETEROGENEOUS CATALYST

Bio catalyst- Enzymatic Catalysis

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Acknowledgement

• NCERT XIIth Chemistry Textbook- 1

• New Course Chemistry XIIth - Volume 1 Publishers- Pradeep

• ABC of Chemistry XIIth - Volume 1 Publishers- Modern

• Conceptual Chemistry XIIth - Volume 1 Publishers- S. Chand

• ISC chemistry XIth -Volume 1 Publishers- S. Chand