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Transition metals and their compounds can act as…
heterogenrous and homogeneous catalyst
heterogeneous - catalyst in a different phase from the reactants, reaction occurs at the surface of the catalyst
homogenous - catalyst in the same phase as the reactants, catalysed reaction will proceed via an intermediate species
transitions metal ions are effective as catalyst because they have variable oxidation states and easy to gain or lose electrons
How does V2O5 acts as a catalyst in the contact process
is reduced to VO2 but regenerated so oxidised back by reacting with oxygen
Explain how a catalytic converter decrease CO and NO (use of catalyst)
adsorption of CO and NO onto the surface of catalyst
weakening of bonds and chemical reaction takes place on the surface
then desorbs CO2 and N2 from the surface of catalyst
What is the role of Fe2+ in catalysing the reaction between I- and S2O8 2-
what is the role of Mn2+ in autocatalysing the reaction between MnO4- and C2O42-
oxidised to Fe3+ and then reacts with I- and reduced to Fe2+, so regenerated, acts as catalyst. This reaction is quite slow due to collisions between two -ve charged ions, so has repulsion
MnO4- is reduced to Mn 2+, so Mn2+ as the product is able to acts as a catalyst for the reaction
