Catalysts are defined as those substances which alter the rate of reaction by changing the path of reaction. Most of the time a catalyst is used to speed up or increase the rate of the reaction.
There are several types of catalysts that can be used depending on the need or requirement of the chemical reaction. They are as follows
- Positive Catalyst
- Negative Catalyst
Let us know about negative catalyst in this article
Catalysts that decrease or retard the rate of reaction is known as negative catalysts. Chemical reactions are retarded by the presence of foreign substances and these substances are negative catalysts.
- Catalysts which decrease the rate of reaction and negative catalyst.
- It decreases the rate of reaction by increasing the activation energy barrier which decreases the number of reactant molecules to transform into products and hence the rate of reaction decreases.
A few examples of negative catalysts are:
- Phosphoric acid labours as a negative catalyst for the decomposition of H2O2
- Alcohol acts as a negative catalyst in the oxidation of Na2SO3