Heterogeneous and Homogeneous catalysts

https://www.youtube.com/watch?v=RHT7SocYKZk

Whats a heterogeneous catalyst

Has a different physical state (phase ) to the reactants

Whats a homogeneous catalyst

Has the same physical state (phase) as the reactants.

Whats example of hetergeneous catalyst

Iron (solid) is used as a catalyst in haber process

How do hetergeneous catalysts work

In first stage, the reactant molecules form weak bonds with surface of catalyst (adsorption)

In second stage, the reaction takes place to form the products

In final stage, the product molecules are released from the surface of the catalyst (desorption)

Example of homogeneous catalysts

Ozone is reacted to form oxygen, the reaction is catalysed by a chlorine free radical.

What are the two stages of homogeneous ctaalyst

The catalyst forms the intermediate in stage 1]

In stage 2 , the intermediate reacts again and catalyst is regenerated