The production of maleic anhydride by the air oxidation of benzene was recently studied using a vanadium pentoxide catalyst. [Chem. Eng. Sci., 43, 1051 (1988).]
The reactions that occur are:
Reaction 1: |
C6H6 + (9/2)O2 C4H2O3 + 2CO2 + 2H2O |
Reaction 2: |
C4H2O3 + 3O2 4CO2 + H2O |
Reaction 3: |
C6H6 + (15/2)O2 4CO2 + 3H2O |
Because these reactions were carried out in excess air, volume change with reaction can be neglected, and the reactions can be written symbolically as this reaction sequence, where Reaction 1 is second-order and all others are first-order:
A = Benzene, B = Maleic anhydride, C = Products (H2O, CO2), and D = Products (CO2, H2O)
k1 = 42800 exp [-12,660/T(K)]
k2 = 70,100 exp -15,000/T(K)]
k3 = 26 exp [-10,800/T(K)]
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