HOMOGENEOUS AND HETEROGENEOUS CATALYSIS Powerpoint

This Powerpoint material is suitable for students and teachers sitting and teaching chemistry in A LEVELS for all syllabuses.
The following are areas covered in this document.

1 explain that catalysts can be homogeneous or heterogeneous
2 describe the mode of action of a heterogeneous catalyst to include adsorption of reactants, bond weakening
and desorption of products, for example:
(a) iron in the Haber process
(b) palladium, platinum and rhodium in the catalytic removal of oxides of nitrogen from the exhaust gases
of car engines
3 describe the mode of action of a homogeneous catalyst by being used in one step and reformed in a later
step, for example:
(a) atmospheric oxides of nitrogen in the oxidation of atmospheric sulfur dioxide
(b) Fe2+ or Fe3+ in the I–/S2O8 2– reaction

4 understand that knowledge of the rate equations for the hydrolysis of
halogenoalkanes can be used to provide evidence for SN1 and SN2 mechanisms for tertiary and primary halogenoalkane hydrolysis
5 be able to use calculations and graphical methods to find the activation energy for a reaction from experimental data
The Arrhenius equation will be given if needed.
6 understand the use of a solid (heterogeneous) catalyst for industrial reactions, inthe gas phase, in terms of providing a surface for the reaction