Thermal decomposition of copper oxalate and potassium oxalatocuprate according to in operando XPS data

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Resumo

Thermal decomposition processes in the rangefrom room temperature to 400°C of copper(II) oxalate CuC2O4⋅½H2O and potassium oxalate cuprate(II) K2Cu(C2O4)2⋅2H2O in vacuum at the residual pressure 10–5mm Hg with XPS and Auger spectra recordedin operandoare studied. An X-ray photoelectronspectrometer with a magnetic energy analyzer is used. The analysisof XPS and Auger spectroscopy data shows that thermal decompositionof CuC2O4⋅½H2O involves the stages ofdetachment of crystallization water (150–265°C), CO2(265–285°C)with an unstable intermediate product formed and decomposed at 285°C with the metallic copper residue formed with admixtureof 11–13 mol. % of copper(I) oxide. Thermal decomposition of K2Cu(C2O4)2⋅2H2O involves the stages of elimination of crystallization water (85–120°C) anddecomposition of the obtained anhydrous oxalate with elimination of CO2and CO (250–290°C).

Sobre autores

N. Lomova

Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences

Email: chaus@udman.ru
Izhevsk, 426067 Russia

I. Kazantseva

Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences

Email: chaus@udman.ru
Izhevsk, 426067 Russia

M. Shumilova

Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences

Email: chaus@udman.ru
Izhevsk, 426067 Russia

N. Pastukhova

Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences

Email: chaus@udman.ru
Izhevsk, 426067 Russia

N. Isupov

Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences

Email: chaus@udman.ru
Izhevsk, 426067 Russia

D. Rybin

Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences

Email: chaus@udman.ru
Izhevsk, 426067 Russia

F. Chausov

Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences

Email: chaus@udman.ru
Izhevsk, 426067 Russia

V. Boldyrev

V. V. Voevodsky Institute of Chemical Kinetics and Combustion, Siberian Branch of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: chaus@udman.ru
Novosibirsk, 630090 Russia

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