Effect of Preparation Conditions of Fe@SiO<sub>2</sub> Catalyst on Its Structure Using High-Pressure Activity Studies in a 3D-Printed SS Microreactor
Fischer–Tropsch synthesis (FTS) in a 3D-printed stainless steel (SS) microchannel microreactor was investigated using Fe@SiO<sub>2</sub> catalysts. The catalysts were prepared by two different techniques: one pot (OP) and autoclave (AC). The mesoporous structure of the two catalysts, Fe@...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Molecules |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1420-3049/30/2/280 |
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| Summary: | Fischer–Tropsch synthesis (FTS) in a 3D-printed stainless steel (SS) microchannel microreactor was investigated using Fe@SiO<sub>2</sub> catalysts. The catalysts were prepared by two different techniques: one pot (OP) and autoclave (AC). The mesoporous structure of the two catalysts, Fe@SiO<sub>2</sub> (OP) and Fe@SiO<sub>2</sub> (AC), ensured a large contact area between the reactants and the catalyst. They were characterized by N<sub>2</sub> physisorption, H<sub>2</sub> temperature-programmed reduction (H<sub>2</sub>-TPR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron microscopy (XPS), and thermogravimetric analysis–differential scanning calorimetry (TGA-DSC) techniques. The AC catalyst had a clear core–shell structure and showed a much greater surface area than that prepared by the OP method. The activities of the catalysts in terms of FTS were studied in the 200–350 °C temperature range at 20-bar pressure with a H<sub>2</sub>/CO molar ratio of 2:1. The Fe@SiO<sub>2</sub> (AC) catalyst showed higher selectivity and higher CO conversion to olefins than Fe@SiO<sub>2</sub> (OP). Stability studies of both catalysts were carried out for 30 h at 320 °C at 20 bar with a feed gas molar ratio of 2:1. The Fe@SiO<sub>2</sub> (AC) catalyst showed higher stability and yielded consistent CO conversion compared to the Fe@SiO<sub>2</sub> (OP) catalyst. |
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| ISSN: | 1420-3049 |