Synthesis, Characterization and Catalytic Evaluation of Chromium Oxide Deposited on Titania–Silica Mesoporous Nanocomposite for the Ethane Dehydrogenation with CO<sub>2</sub>
Ti modification of mesoporous silica support has been reported as an effective way to enhance Cr–Ti–Si interactions that, in turn, impact the catalytic dehydrogenation of ethane with CO<sub>2</sub>. However, such modification necessitates a repeated, time-consuming and tedious process. I...
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MDPI AG
2020-04-01
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| author | Abdulrhman S. Al-Awadi Ahmed Mohamed El-Toni Saeed M. Al-Zahrani Ahmed E. Abasaeed Aslam Khan |
| author_facet | Abdulrhman S. Al-Awadi Ahmed Mohamed El-Toni Saeed M. Al-Zahrani Ahmed E. Abasaeed Aslam Khan |
| author_sort | Abdulrhman S. Al-Awadi |
| collection | DOAJ |
| description | Ti modification of mesoporous silica support has been reported as an effective way to enhance Cr–Ti–Si interactions that, in turn, impact the catalytic dehydrogenation of ethane with CO<sub>2</sub>. However, such modification necessitates a repeated, time-consuming and tedious process. In this work, a simple, fast and facile approach has been utilized to synthesize chromium-oxide-loaded titania–silica mesoporous nanocomposites. A series of Cr(y)/Ti(x)–Si mesoporous nanocomposite catalysts with varying Ti and Cr contents were prepared and tested in the dehydrogenation of ethane with carbon dioxide. The as-synthesized catalysts were characterized by XRD, TEM, SEM, BET, UV–Vis–DR, XPS and H<sub>2</sub>–TPR techniques. The effect of titanium content, as well as chromium loading on the performance of the prepared Cr(y)/Ti(x)–Si catalysts, was investigated. It was found that 2.2 and 8 wt % are the optimum titanium and chromium contents in the synthesized catalysts for obtaining the highest catalytic activity. The superior catalytic performance of the Cr(8)/Ti(2.2)–Si catalyst can be attributed to a higher dispersion of the Cr species, as well as a higher content of the redox Cr species on the surface of the Cr/Ti–Si catalyst. The results showed that the Cr(8)/Ti(2.2)–Si catalyst efficiently dehydrogenated C<sub>2</sub>H<sub>6</sub> in the presence of CO<sub>2</sub> giving a 52.3% ethane conversion and 48.0% ethylene yield at 700 °C reaction temperature. |
| first_indexed | 2024-03-10T20:21:31Z |
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| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T20:21:31Z |
| publishDate | 2020-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-acb05108735f48718a8dcb094bd567662023-11-19T22:09:47ZengMDPI AGCrystals2073-43522020-04-0110432210.3390/cryst10040322Synthesis, Characterization and Catalytic Evaluation of Chromium Oxide Deposited on Titania–Silica Mesoporous Nanocomposite for the Ethane Dehydrogenation with CO<sub>2</sub>Abdulrhman S. Al-Awadi0Ahmed Mohamed El-Toni1Saeed M. Al-Zahrani2Ahmed E. Abasaeed3Aslam Khan4Chemical Engineering Department, King Saud University, Riyadh 11421, Saudi ArabiaKing Abdullah Institute for Nanotechnology, King Saud University, Riyadh 11451, Saudi ArabiaChemical Engineering Department, King Saud University, Riyadh 11421, Saudi ArabiaChemical Engineering Department, King Saud University, Riyadh 11421, Saudi ArabiaKing Abdullah Institute for Nanotechnology, King Saud University, Riyadh 11451, Saudi ArabiaTi modification of mesoporous silica support has been reported as an effective way to enhance Cr–Ti–Si interactions that, in turn, impact the catalytic dehydrogenation of ethane with CO<sub>2</sub>. However, such modification necessitates a repeated, time-consuming and tedious process. In this work, a simple, fast and facile approach has been utilized to synthesize chromium-oxide-loaded titania–silica mesoporous nanocomposites. A series of Cr(y)/Ti(x)–Si mesoporous nanocomposite catalysts with varying Ti and Cr contents were prepared and tested in the dehydrogenation of ethane with carbon dioxide. The as-synthesized catalysts were characterized by XRD, TEM, SEM, BET, UV–Vis–DR, XPS and H<sub>2</sub>–TPR techniques. The effect of titanium content, as well as chromium loading on the performance of the prepared Cr(y)/Ti(x)–Si catalysts, was investigated. It was found that 2.2 and 8 wt % are the optimum titanium and chromium contents in the synthesized catalysts for obtaining the highest catalytic activity. The superior catalytic performance of the Cr(8)/Ti(2.2)–Si catalyst can be attributed to a higher dispersion of the Cr species, as well as a higher content of the redox Cr species on the surface of the Cr/Ti–Si catalyst. The results showed that the Cr(8)/Ti(2.2)–Si catalyst efficiently dehydrogenated C<sub>2</sub>H<sub>6</sub> in the presence of CO<sub>2</sub> giving a 52.3% ethane conversion and 48.0% ethylene yield at 700 °C reaction temperature.https://www.mdpi.com/2073-4352/10/4/322titania–silicamesoporous nanocompositeCr catalystethane oxidative dehydrogenation |
| spellingShingle | Abdulrhman S. Al-Awadi Ahmed Mohamed El-Toni Saeed M. Al-Zahrani Ahmed E. Abasaeed Aslam Khan Synthesis, Characterization and Catalytic Evaluation of Chromium Oxide Deposited on Titania–Silica Mesoporous Nanocomposite for the Ethane Dehydrogenation with CO<sub>2</sub> Crystals titania–silica mesoporous nanocomposite Cr catalyst ethane oxidative dehydrogenation |
| title | Synthesis, Characterization and Catalytic Evaluation of Chromium Oxide Deposited on Titania–Silica Mesoporous Nanocomposite for the Ethane Dehydrogenation with CO<sub>2</sub> |
| title_full | Synthesis, Characterization and Catalytic Evaluation of Chromium Oxide Deposited on Titania–Silica Mesoporous Nanocomposite for the Ethane Dehydrogenation with CO<sub>2</sub> |
| title_fullStr | Synthesis, Characterization and Catalytic Evaluation of Chromium Oxide Deposited on Titania–Silica Mesoporous Nanocomposite for the Ethane Dehydrogenation with CO<sub>2</sub> |
| title_full_unstemmed | Synthesis, Characterization and Catalytic Evaluation of Chromium Oxide Deposited on Titania–Silica Mesoporous Nanocomposite for the Ethane Dehydrogenation with CO<sub>2</sub> |
| title_short | Synthesis, Characterization and Catalytic Evaluation of Chromium Oxide Deposited on Titania–Silica Mesoporous Nanocomposite for the Ethane Dehydrogenation with CO<sub>2</sub> |
| title_sort | synthesis characterization and catalytic evaluation of chromium oxide deposited on titania silica mesoporous nanocomposite for the ethane dehydrogenation with co sub 2 sub |
| topic | titania–silica mesoporous nanocomposite Cr catalyst ethane oxidative dehydrogenation |
| url | https://www.mdpi.com/2073-4352/10/4/322 |
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