Heterogenous Catalysts

Question 1

What are heterogeneous catalysts

Answer 1

They catalyse a reaction on its surface
Reactants attach to the metal active sites
Increased surface area will increase reactant absorption

Question 2

What is catalyst poisoning

Answer 2

External substances absorbing active sites causing the surface to be coated in impurities
This slows down rate of reaction

Poisoning by sulphur in haber process may hinder efficiency leading to replacement