Thermal Stability and Kinetics of Decomposition of Hydrogen Polyoxides H2O3 and H2O4 in Peroxy Radical Condensates

• Published in: Russian Journal of Physical Chemistry A Vol. 96; no. 6; pp. 1204 - 1214
• Main Authors: Levanov, A. V., Isaikina, O. Ya
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.06.2022; Springer Nature B.V
• Subjects: Chemical Kinetics and Catalysis; Chemistry; Chemistry and Materials Science; Composition; Condensates; Decomposition; Decomposition reactions; Gas evolution; Intervals; Inverse problems; Kinetics; Peroxy radicals; Physical Chemistry; Raman spectra; Temperature; Thermal stability; kinetics of decomposition; peroxy radical condensate; hydrogen tetroxide; direct and inverse problems of kinetics; hydrogen trioxide; energy of activation; nonisothermal kinetics
• ISSN: 0036-0244; 1531-863X
• DOI: 10.1134/S0036024422060140

Experimental studies are performed of the kinetics of decomposition of peroxy radical condensates (PRC) under conditions of a rise in temperature according to a linear law and control during the process by measuring the pressure of gaseous products in a constant volume system. An original way of solving the inverse problem of non-isothermal kinetics is proposed that does not require transformation of experimental dependence P ( T ). Four stages of gas evolution during the decomposition of PRC are discovered, and their temperature intervals and kinetic characteristics are determined. The Raman spectra of peroxy radical condensates (PRC) are analyzed at different temperatures. Based on the results, it is proposed that the stages of decomposition be attributed to the decomposition reactions of hydrogen tetroxide H 2 O 4 and trioxide H 2 O 3 . Temperature intervals of stability and kinetic characteristics of decomposition reactions of polyoxides H 2 O 4 and H 2 O 3 in the composition of PRC are established. The quantitative composition of freshly prepared condensates is determined.