a. Describe in general terms what is meant by desorption.

b. Nickel acts as a catalyst for the hydrogenation of alkenes. For example:

Suggest how nickel catalyses this reaction by referring to the processes of adsorption, reaction on the metal surface and desorption.

c. In catalytic converters, rhodium catalyses the reduction of nitrogen(II) oxide, NO, to nitrogen. Draw diagrams to suggest:

i. How NO is adsorbed onto the surface of the rhodium metal

ii. How nitrogen is formed.

Transcribed Image Text:

Ni CH,-CH, + H,> CH,-CH,