Bimetallic NiFe nanoparticles deposited on hollow glass microspheres (HGMs) of various sizes for the catalytic hydrogenation of CO2

Abstract

The composites based on hollow glass microspheres (HGMs) decorated with nanoparticles of nickel and iron oxides were prepared from the nitrate solutions with ultrasound treatment. Further exposition of these composites in a hydrogen-helium flow leads to the formation of nanosized bimetallic particles of Ni(80)Fe(20) (number in the brackets is estimated as wt%) that are effective in the catalytic reaction of CO2 hydrogenation to methane. Investigation of CO2 conversion was carried out under gas chromatographic control, and methane yield was evaluated for composites with 20 and 60 wt% of grafted bimetallic mass. The TPD MS method was used to study the processes of desorption of particles involved in the mechanism of methane formation. Textural and structural characteristics of as-prepared and post-reacted composites were examined using low-temperature nitrogen adsorption and X-ray diffraction methods.