Oxalic acid decomposition in the presence of hydrazine in nitric acid solutions in solid-phase catalysts

Decomposition of N2H4 and H2C2O4 in HNO3 solutions is studied by titrimetric method in presence of Pt/SiO2 catalyzer and activated carbon is studied. The N2H4 decomposition rate under static conditions in presence of Pt/SiO2 monotonically increasing with temperature, Pt content and catalyzer quantity growth pro solution volume unit and nonmonotonically with HNO3 concentration growth from 0.2 up to 7 mole/l reaching its maximum of 1-2 mole/l in the HNO3 solution. The H2C2O4 concentration in mixture of N2H4 and H2C2O4 remains constant up to almost complete decomposition of N2H4 and only thereafter it decreases. By passage of the H2C2O4 mixture through a column with a catalyzer decomposition begins before the N2H4 complete extinction. 7 refs.; 4 figs.; 9 tabs