Heterogeneous catalyst

Definition

A heterogeneous catalyst is a catalyst that exists in a different phase (solid, liquid, or gas) than the reactants. Typically, the catalyst is a solid and the reactants are in liquid or gas phases.

5 Must Know Facts For Your Next Test

1. Heterogeneous catalysts work by providing a surface for the reaction to take place, which lowers the activation energy.
2. The efficiency of a heterogeneous catalyst depends on its surface area; larger surface areas generally increase catalytic activity.
3. These catalysts can be easily separated from the reaction mixture, making them reusable and cost-effective.
4. Common examples include metals like platinum and palladium used in catalytic converters.
5. Heterogeneous catalysis often involves adsorption of reactants onto the catalyst's surface, where the reaction occurs.

Review Questions

Related terms

Homogeneous Catalyst:

A catalyst that exists in the same phase as the reactants, typically both being liquid or gas.

Activation Energy:

$$E_a$$; The minimum amount of energy required for a chemical reaction to occur.

Adsorption:

The process by which atoms, ions, or molecules adhere to a solid surface.