Abstract
Thermal decomposition of [Co(NH3)6][Fe(C2O4)3]∙3H2O in argon atmosphere, at a low heating rate (3°/min), and in large amounts of the initial complex (~0.1 mole), has been studied. It was possible to distinguish four decomposition steps upon heating: In the temperature range of 50–100 °C—the loss of crystal water; 100–190 °C—stability region of dehydrated complex; 230–270 °C—the range of stability of intermediate phase with the formula CoFe(NH3)2(C2O4)2; 270–350 °C—thermal decomposition of the intermediate with the formation of metallic products and further air oxidation with the formation of Co1.5Fe1.5O4. Catalytic properties of thermolysis products were tested in the decomposition reaction of H2O2 (inactive), oxidation of acetone (average activity), and decomposition of ammonium perchlorate (highly active).
Highlights
IntroductionIron group metals (Fe, Co and Ni) were considered as a base to access of polymetallic catalysts
Iron group metals (Fe, Co and Ni) were considered as a base to access of polymetallic catalysts.Their activity and selectivity can be drastically improved by the addition of other transition elements
A total of 400 g of [Co(NH3 )6 ][Fe(C2 O4 )3 ]·3H2 O was synthesized by mixing aqueous solutions of equivalent amounts of [Co(NH3 )6 ]Cl3 and Na3 [Fe (C2 O4 )3 ]·3H2 O
Summary
Iron group metals (Fe, Co and Ni) were considered as a base to access of polymetallic catalysts. Their activity and selectivity can be drastically improved by the addition of other transition elements. Thermal activation, treatment with an alkaline or acid solutions, with further washing or impregnation, may be used to improve catalytic properties of iron-base catalysts [1,2]. Double complex salts (DCS), containing coordination cation and coordination anion, have been proposed as promising, single-source precursors for polymetallic and oxide materials, with promising catalytic activity [3].
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