The urea decomposition in the process of the heterogeneous catalytic denitration of nitric acid solutions: Part II. Reaction’s products and stoichiometry

The reaction products and the stoichiometry of the urea catalytic decomposition in the system HNO3–HCOOH–Pt/SiO2 were studied with an application of the IR spectroscopy, the mass spectroscopy methods and chemical analysis. It was found that in the presence of 0.1gml−1 1% Pt/SiO2, the 0.1–0.4M (NH2)2...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2003-10, Vol.45 (3), p.197-203
Main Authors: Ananiev, A.V, Broudic, J.-C, Brossard, Ph
Format: Article
Language:English
Subjects:
Catalytic denitration
Nitric acid
Urea decomposition
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Summary:The reaction products and the stoichiometry of the urea catalytic decomposition in the system HNO3–HCOOH–Pt/SiO2 were studied with an application of the IR spectroscopy, the mass spectroscopy methods and chemical analysis. It was found that in the presence of 0.1gml−1 1% Pt/SiO2, the 0.1–0.4M (NH2)2CO decomposes at 50–90°C in the solutions of 2.5–6.4M HNO3 containing 0.25–1.5M HCOOH according to a stoichiometric equation: 3(NH2)2CO+3HCOOH+5HNO3→Pt2N2+N2O+2NH4NO3+NH2CHO+5CO2+6H2O. Soluble reaction products—the ammonium nitrate and the formamide—undergo further a gradual degradation under the conditions of a catalytic denitration reaction that starts when the urea decomposition is completed.
ISSN:0926-3373
1873-3883
DOI:10.1016/S0926-3373(03)00130-9