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- W4293451572 abstract "In this study, the effect produced by the gallium oxides intercalation into MnO x -Al 2 O 3 catalysts on their catalytic properties and structural aspects of the active component formation was investigated. Three series of the catalysts, Mn–Al, Mn–Ga, and Mn–Al-Ga, having a similar Mn content but different Al/Ga ratio, were synthesized by coprecipitation and subsequent calcination at temperatures from 600 to 1200°С°. The catalysts were tested in CO oxidation. For the Mn–Al series of catalysts, a thermal activation effect is observed, defined as an increase in catalytic activity after high-temperature treatment at 900-1000°С. The increase in the activity after calcination is related to the formation of the Mn 3-x Al x O 4 solid solution at the synthesis temperature and its segregation upon cooling. Segregation of the solid solution leads to the formation of the Mn 3 O 4+δ defect oxide and an amorphous aluminum-containing component. The addition of 5%Ga to the Mn–Al catalyst changes the phase transformation route during thermal activation. The in situ XRD data has showed that at 1000°С the high-temperature solid solution (MnGaAl) 3 O 4 with the cubic spinel structure is formed; however, its further segregation upon cooling is hindered. The introduction of gallium stabilizes the structure of the (MnGaAl) 3 O 4 mixed oxide, the parent oxide is partially decomposed after cooling with Mn 3 O 4 nanoparticles formation. However the amount of produced active Mn 3 O 4 particles and/or weakly bound oxygen is much lower, which in turn adversely affects the catalytic properties. • A high-temperature treatment at 900-1000°С increases catalytic activity of the Mn–Al catalysts. • The decomposition of (Mn,Al) 3 O 4 solid solution leads to formation an active catalyst. • The addition of Ga to the Mn–Al catalyst changes the phase transformation route during synthesis. • The addition of Ga to the Mn–Al catalyst stabilizes the structure of solid solution." @default.
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- W4293451572 date "2022-11-01" @default.
- W4293451572 modified "2023-09-23" @default.
- W4293451572 title "The thermal activation of MnOx-Al2O3 catalysts: Effect of gallium doping" @default.
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- W4293451572 doi "https://doi.org/10.1016/j.matchemphys.2022.126715" @default.
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