Effects of Silica Shell Encapsulated Nanocrystals on Active χ-Fe<sub>5</sub>C<sub>2</sub> Phase and Fischer–Tropsch Synthesis
Among various iron carbide phases, χ-Fe<sub>5</sub>C<sub>2</sub>, a highly active phase in Fischer–Tropsch synthesis, was directly synthesized using a wet-chemical route, which makes a pre-activation step unnecessary. In addition, χ-Fe<sub>5</sub>C<sub>2<...
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MDPI AG
2022-10-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/20/3704 |
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| author | Seunghee Cha Heewon Kim Hyunkyung Choi Chul Sung Kim Kyoung-Su Ha |
| author_facet | Seunghee Cha Heewon Kim Hyunkyung Choi Chul Sung Kim Kyoung-Su Ha |
| author_sort | Seunghee Cha |
| collection | DOAJ |
| description | Among various iron carbide phases, χ-Fe<sub>5</sub>C<sub>2</sub>, a highly active phase in Fischer–Tropsch synthesis, was directly synthesized using a wet-chemical route, which makes a pre-activation step unnecessary. In addition, χ-Fe<sub>5</sub>C<sub>2</sub> nanoparticles were encapsulated with mesoporous silica for protection from deactivation. Further structural analysis showed that the protective silica shell had a partially ordered mesoporous structure with a short range. According to the XRD result, the sintering of χ-Fe<sub>5</sub>C<sub>2</sub> crystals did not seem to be significant, which was believed to be the beneficial effect of the protective shell providing restrictive geometrical space for nanoparticles. More interestingly, the protective silica shell was also found to be effective in maintaining the phase of χ-Fe<sub>5</sub>C<sub>2</sub> against re-oxidation and transformation to other iron carbide phases. Fischer–Tropsch activity of χ-Fe<sub>5</sub>C<sub>2</sub> in this study was comparable to or higher than those from previous reports. In addition, CO<sub>2</sub> selectivity was found to be very low after stabilization. |
| first_indexed | 2024-03-09T19:39:42Z |
| format | Article |
| id | doaj.art-afb2c353a64a440aa5973f1d51594be3 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T19:39:42Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-afb2c353a64a440aa5973f1d51594be32023-11-24T01:42:11ZengMDPI AGNanomaterials2079-49912022-10-011220370410.3390/nano12203704Effects of Silica Shell Encapsulated Nanocrystals on Active χ-Fe<sub>5</sub>C<sub>2</sub> Phase and Fischer–Tropsch SynthesisSeunghee Cha0Heewon Kim1Hyunkyung Choi2Chul Sung Kim3Kyoung-Su Ha4Department of Chemical and Biomolecular Engineering, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, KoreaDepartment of Chemical and Biomolecular Engineering, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, KoreaDepartment of Physics, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul 02707, KoreaDepartment of Physics, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul 02707, KoreaDepartment of Chemical and Biomolecular Engineering, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, KoreaAmong various iron carbide phases, χ-Fe<sub>5</sub>C<sub>2</sub>, a highly active phase in Fischer–Tropsch synthesis, was directly synthesized using a wet-chemical route, which makes a pre-activation step unnecessary. In addition, χ-Fe<sub>5</sub>C<sub>2</sub> nanoparticles were encapsulated with mesoporous silica for protection from deactivation. Further structural analysis showed that the protective silica shell had a partially ordered mesoporous structure with a short range. According to the XRD result, the sintering of χ-Fe<sub>5</sub>C<sub>2</sub> crystals did not seem to be significant, which was believed to be the beneficial effect of the protective shell providing restrictive geometrical space for nanoparticles. More interestingly, the protective silica shell was also found to be effective in maintaining the phase of χ-Fe<sub>5</sub>C<sub>2</sub> against re-oxidation and transformation to other iron carbide phases. Fischer–Tropsch activity of χ-Fe<sub>5</sub>C<sub>2</sub> in this study was comparable to or higher than those from previous reports. In addition, CO<sub>2</sub> selectivity was found to be very low after stabilization.https://www.mdpi.com/2079-4991/12/20/3704Fischer–Tropschiron carbideencapsulationordered mesoporous silica |
| spellingShingle | Seunghee Cha Heewon Kim Hyunkyung Choi Chul Sung Kim Kyoung-Su Ha Effects of Silica Shell Encapsulated Nanocrystals on Active χ-Fe<sub>5</sub>C<sub>2</sub> Phase and Fischer–Tropsch Synthesis Nanomaterials Fischer–Tropsch iron carbide encapsulation ordered mesoporous silica |
| title | Effects of Silica Shell Encapsulated Nanocrystals on Active χ-Fe<sub>5</sub>C<sub>2</sub> Phase and Fischer–Tropsch Synthesis |
| title_full | Effects of Silica Shell Encapsulated Nanocrystals on Active χ-Fe<sub>5</sub>C<sub>2</sub> Phase and Fischer–Tropsch Synthesis |
| title_fullStr | Effects of Silica Shell Encapsulated Nanocrystals on Active χ-Fe<sub>5</sub>C<sub>2</sub> Phase and Fischer–Tropsch Synthesis |
| title_full_unstemmed | Effects of Silica Shell Encapsulated Nanocrystals on Active χ-Fe<sub>5</sub>C<sub>2</sub> Phase and Fischer–Tropsch Synthesis |
| title_short | Effects of Silica Shell Encapsulated Nanocrystals on Active χ-Fe<sub>5</sub>C<sub>2</sub> Phase and Fischer–Tropsch Synthesis |
| title_sort | effects of silica shell encapsulated nanocrystals on active χ fe sub 5 sub c sub 2 sub phase and fischer tropsch synthesis |
| topic | Fischer–Tropsch iron carbide encapsulation ordered mesoporous silica |
| url | https://www.mdpi.com/2079-4991/12/20/3704 |
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