Topic 31-Inorganic Catalysts

Question 1

Why are transition metals good catalysts?

Answer 1

They can change ox state

Question 2

Heterogenous catalysts

Answer 2

A catalyst which is in a different phase to the reactants

Question 3

Two examples of heterogenous catalysts

Answer 3

Iron in haber process
Vanadium oxide in contact process

Question 4

Equation 1 and 2 for contact process

Answer 4

(1) V2O5 + SO2 —-> V2O4 + SO3
(2) V2O4 + 1/2O2 —> V2O5

Question 5

How to heterogenous catalysts work

Answer 5

Reactant adsorbed onto active sites on surface of catalyst
This increases proximity of reactants
It also holds reactants in the correct orientation
Weakens bonds in the reactants

Question 6

What can increase the effectiveness of a heterogenous catalyst?

Answer 6

A support medium

Question 7

Homogenous catalyst

Answer 7

A catalyst which is in the same phase as the reactants

Question 8

Reaction of I- and S2O8 2- (Both steps)

Answer 8

(1) S2O8 (2-)+ 2Fe2+ —-> 2Fe3+ + 2SO4 (2-)
(2) 2Fe3 + 2I- —> I2 (aq) + 2Fe2+

Question 9

Autocatalysis of maganate with C2O4 (2-) (Both steps)

Answer 9

(1) MnO4- + 4Mn2+ + 8H+ —-> 5Mn3+ + 4H2O
(2) 2Mn3+ + C2O42- —> 2Mn2+ + 2CO2

Question 10

Defenition of autocatalyst

Answer 10

The catalyst for a reaction is the product