Synthesis and Properties of Manganese Oxides Obtained via Combustion Reactions with Glycine and Citric Acid

Abstract

Manganese oxides were synthesized via combustion reactions with glycine and citric acid. When the synthesis used reaction solutions containing predominant amounts of citric acid Σ(φcit + φgl) = 1.8–2.1 at φgl = 0.5, the reactions proceeded with moderate intensity at a maximum temperature not higher than 315°C. The resulting nanopowders (16–33 nm) were dominated by tetragonal Mn3O4. The primary crystallites were assembled into laced “crumpled paper” aggregates with numerous holes and through pores and had specific surface area of 22–27 m2/g. The variations of the maximum combustion temperature as a function of the reactor area, the mass of the obtained oxide, and the water content in the xerogel were calculated.