Electron Temperature in Plasma-Chemical Processes of Synthesis of Aluminum Oxide Microparticles with Deposited Platinum Nanoparticles

The article presents calculations of the electron temperature based on the spectral lines of iron and platinum atoms in the plasma-chemical process of obtaining platinum catalysts: platinum nanoparticles on aluminum oxide microparticles as a carrier. The process was initiated by a microwave discharge in a powder mixture consisting of platinum microparticles and γ-Al₂O₃, as a result of treatment with powerful (up to 400 kW) microwave radiation pulses, the source of which was a gyrotron operating at a frequency of 75 GHz. It is shown that the process leads to the formation of platinum nanoparticles on the surface of aluminum oxide microparticles; the spectral characteristics of the process were measured, and the temperatures were estimated. The data obtained indicate the possibility of transferring platinum particles to the surface of aluminum oxide particles through the gas phase.