As Selenium melting point is 250C, we can't do combustion synthesis. Can anyone suggest us the method of synthesizing SeO2 using Se precursor?
Hello,
there is an review on selenium dioxide: Selenium Dioxide: Preparation, Properties, and Use as Oxidizing Agent. G. R. Waitkins, C. W. Clark, Chem. Rev., 1945, 36 (3), pp 235–289
In the laboratory it is oxidized to selenium dioxide by means of strong oxidizing agents such as nitric acid. The usual procedure is to add commercial selenium powder in small amounts to an excess of concentrated nitric acid. The initial reaction is highly exothermic, and clouds of brown fumes of nitrogen dioxide are evolved. The clear solution of selenious acid is fumed to remove excess nitric acid and then evaporated to dryness to dehydrate selenious acid to selenium dioxide. The crude selenium dioxide obtained in this manner is purified readily by sublimation at 317°C. or above to form glistening, white, monoclinic crystals. A product of high purity also can be obtained by direct oxidation of selenium with air or oxygen, using traces of nitrogen oxides as catalysts to promote the reaction. In this method air or oxygen is bubbled into con- centrated nitric acid and then is swept through a glass tube over molten selenium. The selenium dioxide sublimes as it is formed and collects in the cooler end of the tube or in a receiving flask.
With best regards
Marc Birringer
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