Plasma-chemical preparation of nanostructured catalysts for low-temperature steam conversion of carbon monoxide: properties of catalysts

Abstract

The conditions and the process parameters of the plasma-chemical synthesis and/or regeneration of catalysts for low-temperature steam conversion of CO under the conditions of electric-arc low-temperature plasma have been investigated, as depending on the plasma-chemical process parameters and the plasma-chemical reactors (PCR) type (with “cold walls” (CW) or “warm walls” (WW)), samples that have the following properties were obtained: specific surface, up to 56 m 2/g; particle sizes, 10–60 nm, in some cases, up to 200 nm; faulty crystal lattice structure; phases of ZnO, CuO, Cu 2O and CuAl 2O 4. The temperature from 2000 to 3800 K was experimentally provided as the optimal temperature range in the PCR for synthesis of samples with maximum dispersity and catalytic activity. A complex physicochemical analysis of the plasma-chemically synthesised and/or regenerated sample by the following methods was performed: X-ray diffraction patterns, electron-microscope, chemical and other analyses.