Abstract
Co–Al and Co–V–Al intermetallics produced by centrifugal self-propagating high-temperature synthesis (SHS) were used as precursors for preparation of catalysts for deep oxidation and hydrogenation of CO2. Leaching in NaOH solution and stabilization with H2O2 solution of precursors were carried out in permanent magnetic field (MF) (0.24 Т) and alternating magnetic field (0.13 Т, 50 Hz). Prepared Co и Co–V (95Co–5V, 90Co–10V) granular catalysts with size of 100–300 µm were characterized by XRD, SEM, EDS, and BET method and revealed to have a scaly surface structure. It was shown that the type of MF affects phase composition and surface morphology, as well as specific surface and activity in deep oxidation of CO and hydrocarbons as an important part of the neutralization of gas emissions, and hydrogenation of CO2, the processing of which would reduce atmospheric pollution with this greenhouse gas. Catalysts obtained in alternating MF was found to possess higher activity in the process of deep oxidation.
Highlights
Of particular interest is to study various aspects of magnetic field (MF) influence on different substances and materials
We showed that intermetallic Al13 Co4 is the major phase of (100Co)Alx precursor; Co–V–Al precursors consist of Al5 Co2, Al0.52 Co0.48, and Al80 V20
The first Co и Co–V (95Co–5V, 90Co–10V) catalysts to be prepared by leaching of SHS-produced granular intermetallics in NaOH solution followed by stabilization with
Summary
Of particular interest is to study various aspects of magnetic field (MF) influence on different substances and materials (ferromagnets, paramagnets and diamagnets). Studies showed significant effects of such action on metals and their alloys (both ferrous and non-ferrous ones), melts during their crystallization, and in some cases on the solid phase. In Fe–C alloys [1,2], a strong MF changes the eutectoid composition and increases austenite/ferrite temperature that leads to a shift in phase equilibrium. Magnetic annealing of cold-rolled interstitial-free steel was shown in [15] to inhibit crystallization and to cause elongation of recrystallized grains along the MF direction. In case of cold-rolled pure Cu, the annealing promotes the recovery and recrystallization processes [16]. Grain growth was observed for cold-rolled commercial pure Zn [17] and Ti [18], iron alloys, non-ferrous materials, and steels [19], which was attributed to an enhanced mobility of grain boundaries
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