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Carbon dioxide hydrogenation over alumina-silica composites-supported cobalt catalyst |
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| รหัสดีโอไอ | |
| Title | Carbon dioxide hydrogenation over alumina-silica composites-supported cobalt catalyst |
| Creator | Thamonwan Jetsadanurak |
| Contributor | Bunjerd Jongsomjit |
| Publisher | Chulalongkorn University |
| Publication Year | 2553 |
| Keyword | Hydrogenation, Carbon dioxide, Silica, Aluminum oxide, Cobalt catalysts, Composite materials |
| Abstract | This research focused on investigation of characteristics of the alumina-silica composite supports that were prepared by deposition of alumina particles on the spherical silica particle (SSP) surface using hydrolysis of aluminium isopropoxide with loading variation of alumina onto silica to obtain AlSSP with calcination temperature at 650 and 1000℃. Furthermore, the characteristics of the impregnated cobalt on spherical silica particle support (CoSSP) and alumina-silica composite support (CoAlSSP) were investigated. In addition, the catalytic activity and selectivity to methane of CoSSP and all of CoAlSSP samples for carbon dioxide hydrogenation with reaction temperature at 220℃ was also investigated. All samples were characterized by BET surface area, XRD, DTA/TG, EDX, SEM, TEM, TPR, and CO chemisorptions methods. It was found that thermal stability of alumina can be enhanced with adding to silica. Besides, at various compositions of alumina-silica, increased amount of alumina exhibited a larger crystalline size of alumina. Moreover, the alumina distribution on the silica surface was good. In addition, at high calcination temperature, it was found that sintering effect was impeded by alumina addition. Furthermore, the reducibilities of cobalt supported on alumina-silica composites catalysts were slightly decreased. Based on the carbon dioxide hydrogenation reaction results, the carbon dioxide conversion and selectivity to methane of the cobalt supported on alumina-silica composite are 26.12% and 94.02%, respectively upon the reaction temperature at 220℃. |
| URL Website | cuir.car.chula.ac.th |
