Some peculiarities of nano-dispersed catalysts synthesized or regenerated in an arc plasma conditions

Abstract

In this review we present our considerations and investigations about: • The thermodynamic and kinetic peculiarities of plasma-chemical processes (PCPs) for the preparation or regeneration of nano-dispersed catalysts (NDC). • The mechanism of evaporation of micron-size particles under the conditions of powder-carrier high enthalpy chemically reactive plasma jets and the mechanism of condensation of NDC phases upon quenching. • The correlation between the parameters of PCPs occurring in powder carrier chemically reactive high-enthalpy flows and the dispersity of the desired condensed NDC. • The optimal PCPs parameters (average mass temperature, type and geometry of plasma-chemical mixing chambers and reactors, quenching, trapping of condensed phases, etc.) in neutral, reducing, oxidizing and reducing–oxidizing (redox) media, leading to the obtaining of the desired condensed catalysts with controlled dispersity, chemical activity, phase composition, crystal lattice defects, etc. • The characterization of some properties of plasma-chemically synthesized and/or regenerated NDC (chemical, physicochemical, physical, catalytic, etc.).