Supported Molybdenum Carbide and Nitride Catalysts for Carbon Dioxide Hydrogenation
Copyright © 2020 Abou Hamdan, Nassereddine, Checa, Jahjah, Pinel, Piccolo and Perret..
Catalysts based on molybdenum carbide or nitride nanoparticles (2-5 nm) supported on titania were prepared by wet impregnation followed by a thermal treatment under alkane (methane or ethane)/hydrogen or nitrogen/hydrogen mixture, respectively. The samples were characterized by elemental analysis, volumetric adsorption of nitrogen, X-ray diffraction, and aberration-corrected transmission electron microscopy. They were evaluated for the hydrogenation of CO2 in the 2-3 MPa and 200-300°C ranges using a gas-phase flow fixed bed reactor. CO, methane, methanol, and ethane (in fraction-decreasing order) were formed on carbides, whereas CO, methanol, and methane were formed on nitrides. The carbide and nitride phase stoichiometries were tuned by varying the preparation conditions, leading to C/Mo and N/Mo atomic ratios of 0.2-1.8 and 0.5-0.7, respectively. The carbide activity increased for lower carburizing alkane concentration and temperature, i.e., lower C/Mo ratio. Enhanced carbide performances were obtained with pure anatase titania support as compared to P25 (anatase/rutile) titania or zirconia, with a methanol selectivity up to 11% at 250°C. The nitride catalysts appeared less active but reached a methanol selectivity of 16% at 250°C.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2020 |
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| Erschienen: |
2020 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:8 |
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| Enthalten in: |
Frontiers in chemistry - 8(2020) vom: 04., Seite 452 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Abou Hamdan, Marwa [VerfasserIn] |
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| Links: |
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| Themen: |
CO2 hydrogenation |
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| Anmerkungen: |
Date Revised 28.09.2020 published: Electronic-eCollection Citation Status PubMed-not-MEDLINE |
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| doi: |
10.3389/fchem.2020.00452 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM311610099 |
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| 520 | |a Copyright © 2020 Abou Hamdan, Nassereddine, Checa, Jahjah, Pinel, Piccolo and Perret. | ||
| 520 | |a Catalysts based on molybdenum carbide or nitride nanoparticles (2-5 nm) supported on titania were prepared by wet impregnation followed by a thermal treatment under alkane (methane or ethane)/hydrogen or nitrogen/hydrogen mixture, respectively. The samples were characterized by elemental analysis, volumetric adsorption of nitrogen, X-ray diffraction, and aberration-corrected transmission electron microscopy. They were evaluated for the hydrogenation of CO2 in the 2-3 MPa and 200-300°C ranges using a gas-phase flow fixed bed reactor. CO, methane, methanol, and ethane (in fraction-decreasing order) were formed on carbides, whereas CO, methanol, and methane were formed on nitrides. The carbide and nitride phase stoichiometries were tuned by varying the preparation conditions, leading to C/Mo and N/Mo atomic ratios of 0.2-1.8 and 0.5-0.7, respectively. The carbide activity increased for lower carburizing alkane concentration and temperature, i.e., lower C/Mo ratio. Enhanced carbide performances were obtained with pure anatase titania support as compared to P25 (anatase/rutile) titania or zirconia, with a methanol selectivity up to 11% at 250°C. The nitride catalysts appeared less active but reached a methanol selectivity of 16% at 250°C | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a CO2 hydrogenation | |
| 650 | 4 | |a TiO2 | |
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| 700 | 1 | |a Checa, Ruben |e verfasserin |4 aut | |
| 700 | 1 | |a Jahjah, Mohamad |e verfasserin |4 aut | |
| 700 | 1 | |a Pinel, Catherine |e verfasserin |4 aut | |
| 700 | 1 | |a Piccolo, Laurent |e verfasserin |4 aut | |
| 700 | 1 | |a Perret, Noémie |e verfasserin |4 aut | |
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