The effect of the calcination temperature of LaFeO3 precursors on the properties and catalytic activity of perovskite in methane oxidation
Kucharczyk, B; Okal, J; Tylus, W; Winiarski, J; Szczygiel, B
| HERO ID | 6111784 |
|---|---|
| In Press | No |
| Year | 2019 |
| Title | The effect of the calcination temperature of LaFeO3 precursors on the properties and catalytic activity of perovskite in methane oxidation |
| Authors | Kucharczyk, B; Okal, J; Tylus, W; Winiarski, J; Szczygiel, B |
| Journal | Ceramics International |
| Volume | 45 |
| Issue | 2 |
| Page Numbers | 2779-2788 |
| Abstract | In the synthesis of perovskite-type LaFeO3 oxides iron and lanthanum nitrates were used as a precursors. The nitrates were dissolved in water, evaporated, crushed and calcined in temperature range of 650–850 °C. The obtained perovskites were applied as an active layer on monolithic catalysts for the oxidation of methane. The increase in the calcination temperature of the perovskite precursors from 650° to 850°C results in a reduction in the surface area of the powders from 10.1 to 4.2 m2/g. XRD studies revealed that calcination at 800–850 °C caused the formation of an almost homogeneous LaFeO3 perovskite phase. A decrease in the La/Fe surface ratio from 12 to 5.2 with the rise in calcination temperature from 650° to 800°C was detected by XPS. EDX results confirmed that at 750–850 °C, the La/Fe ratio in the perovskite layer is close to the stoichiometric and amount to 1.01–1.03. The highest activity in methane oxidation was achieved when the LaFeO3 perovskite was calcined at 700 °C. A further slight increase in the activity was noticed after H2 treatment. As the calcination temperature of the perovskites is increased, the catalyst activity decreases due to a reduction in the specific surface area, despite the more complete LaFeO3 perovskite phase formation. |
| Doi | 10.1016/j.ceramint.2018.07.299 |
| Wosid | WOS:000453491400011 |
| Url | http://www.sciencedirect.com/science/article/pii/S0272884218320431 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | Perovskites; Calcination; Chemical preparation; Monolithic catalyst |