Vol 28, No 2 (2019)

Solution combustion synthesis (SCS) is a solution approach to the self-propagating high-temperature synthesis (SHS) of nanomaterials. Since its invention in 1988, several simple oxides, mixed oxides, complex oxides, metals, alloys, and sulfides have been prepared by this method. Uniqueness of this technique is in its simplicity, lost cost, energy saving, and short reaction time and it can be scaled up to any kind of application. In the last 20 years, different types of catalysts, especially oxide ones, have been prepared and employed in several kinds of heterogeneous catalytic reactions related to environment, energy, and fine chemical processing. This review addresses the SCS method and catalytic properties of noble metal ionic catalysts, spinels, perovskites, delafossites, and other catalysts prepared in this route. Reactions associated with environmental catalysis, hydrogen energy related catalysis, conversion of CO₂, and CH₄ to useful chemicals and fuels, H₂-O₂ recombination, organic compounds related reactions and electrocatalysis are discussed. Special emphasis has been made on the origin of SCS-synthesized noble metal ionic catalysts and their excellent catalytic properties.

Some results of time-resolved XRD studies (TRXRD) conducted at ISMAN were overviewed in brief. New applications of TRXRD technique to such phenomena as crystallization of amorphous materials, solution-combustion synthesis, and thermal treatment of materials have been demonstrated.

Filtration combustion synthesis of porous sialon ceramics from Al-SiO₂-Si₂Al₄O₄N₄ mixtures in conditions of forced oscillation supply of nitrogen gas was explored. Forced infiltration of gas reactant was found to enhance the extent of nitriding and to decrease maximal combustion temperature due to kinetic restrictions on combustion reaction. The latter circumstance afforded for suppressing the melting and coalescence in combustion product and thus to retain its porosity.

TiZrNiCuAl and TiNbNiCuAl alloys were prepared by thermal explosion and high-energy ball milling, characterized by SEM, XRD and tested for their thermal stability.