Effect of MgFe-LDH with Reduction Pretreatment on the Catalytic Performance in Syngas to Light Olefins
MgFe-layered double hydroxides (LDH) were widely used as catalysts for Fischer–Tropsch synthesis to produce light olefins, in which the state of Fe-species may affect the resulting catalytic active sites. Herein, the typical MgFe-LDH was hydrothermally synthesized and the obtained MgFe-LDH was pretr...
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MDPI AG
2023-03-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/13/3/632 |
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| author | Jie Li Changxiao Li Qiong Tang Zhijun Zuo Lei Liu Jinxiang Dong |
| author_facet | Jie Li Changxiao Li Qiong Tang Zhijun Zuo Lei Liu Jinxiang Dong |
| author_sort | Jie Li |
| collection | DOAJ |
| description | MgFe-layered double hydroxides (LDH) were widely used as catalysts for Fischer–Tropsch synthesis to produce light olefins, in which the state of Fe-species may affect the resulting catalytic active sites. Herein, the typical MgFe-LDH was hydrothermally synthesized and the obtained MgFe-LDH was pretreated with H<sub>2</sub> at different temperatures to reveal the effects of the state of Fe-species on the catalytic performance in Fischer–Tropsch synthesis. MgFe-LDH materials were characterized by X-ray diffraction (XRD), N<sub>2</sub> adsorption–desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), H<sub>2</sub> temperature-programmed reduction (H<sub>2</sub>-TPR), and X-ray photoelectron spectroscopy (XPS). It was found that a MgO-FeO solid solution would be formed with the increase of the reduction temperature, which made the electrons transfer from Mg atoms to Fe atoms and strengthened the adsorption of CO. The pre-reduced treatment toward Mg-Fe-LDH enabled the FeC<sub>x</sub> active sites to be easily formed in situ during the reaction process, leading to the high conversion of CO. CO<sub>2</sub> temperature-programmed desorption (CO<sub>2</sub>-TPD) and H<sub>2</sub> temperature-programmed desorption (H<sub>2</sub>-TPD) analysis confirmed that the surface basicity of the catalysts was increased and the hydrogenation capacity was weakened, the secondary hydrogenation of the olefins was inhibited, and therefore as were the enhancement of O/P in the product and the high selectivity of light olefins (42.7%). |
| first_indexed | 2024-03-11T06:47:20Z |
| format | Article |
| id | doaj.art-18593ddc09d54612bb078bf522783f2a |
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| language | English |
| last_indexed | 2024-03-11T06:47:20Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
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| series | Catalysts |
| spelling | doaj.art-18593ddc09d54612bb078bf522783f2a2023-11-17T10:12:12ZengMDPI AGCatalysts2073-43442023-03-0113363210.3390/catal13030632Effect of MgFe-LDH with Reduction Pretreatment on the Catalytic Performance in Syngas to Light OlefinsJie Li0Changxiao Li1Qiong Tang2Zhijun Zuo3Lei Liu4Jinxiang Dong5College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, ChinaState Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, ChinaMgFe-layered double hydroxides (LDH) were widely used as catalysts for Fischer–Tropsch synthesis to produce light olefins, in which the state of Fe-species may affect the resulting catalytic active sites. Herein, the typical MgFe-LDH was hydrothermally synthesized and the obtained MgFe-LDH was pretreated with H<sub>2</sub> at different temperatures to reveal the effects of the state of Fe-species on the catalytic performance in Fischer–Tropsch synthesis. MgFe-LDH materials were characterized by X-ray diffraction (XRD), N<sub>2</sub> adsorption–desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), H<sub>2</sub> temperature-programmed reduction (H<sub>2</sub>-TPR), and X-ray photoelectron spectroscopy (XPS). It was found that a MgO-FeO solid solution would be formed with the increase of the reduction temperature, which made the electrons transfer from Mg atoms to Fe atoms and strengthened the adsorption of CO. The pre-reduced treatment toward Mg-Fe-LDH enabled the FeC<sub>x</sub> active sites to be easily formed in situ during the reaction process, leading to the high conversion of CO. CO<sub>2</sub> temperature-programmed desorption (CO<sub>2</sub>-TPD) and H<sub>2</sub> temperature-programmed desorption (H<sub>2</sub>-TPD) analysis confirmed that the surface basicity of the catalysts was increased and the hydrogenation capacity was weakened, the secondary hydrogenation of the olefins was inhibited, and therefore as were the enhancement of O/P in the product and the high selectivity of light olefins (42.7%).https://www.mdpi.com/2073-4344/13/3/632light olefinssyngasMgFe-LDHMgO-FeO solid solution |
| spellingShingle | Jie Li Changxiao Li Qiong Tang Zhijun Zuo Lei Liu Jinxiang Dong Effect of MgFe-LDH with Reduction Pretreatment on the Catalytic Performance in Syngas to Light Olefins Catalysts light olefins syngas MgFe-LDH MgO-FeO solid solution |
| title | Effect of MgFe-LDH with Reduction Pretreatment on the Catalytic Performance in Syngas to Light Olefins |
| title_full | Effect of MgFe-LDH with Reduction Pretreatment on the Catalytic Performance in Syngas to Light Olefins |
| title_fullStr | Effect of MgFe-LDH with Reduction Pretreatment on the Catalytic Performance in Syngas to Light Olefins |
| title_full_unstemmed | Effect of MgFe-LDH with Reduction Pretreatment on the Catalytic Performance in Syngas to Light Olefins |
| title_short | Effect of MgFe-LDH with Reduction Pretreatment on the Catalytic Performance in Syngas to Light Olefins |
| title_sort | effect of mgfe ldh with reduction pretreatment on the catalytic performance in syngas to light olefins |
| topic | light olefins syngas MgFe-LDH MgO-FeO solid solution |
| url | https://www.mdpi.com/2073-4344/13/3/632 |
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