Mixed Matrix Vanadium Oxide Catalytic Nanocomposite Membrane For Styrene Oxidation
| dc.contributor.author | Koohestani, Behnam | |
| dc.date.accessioned | 2018-10-18T07:04:29Z | |
| dc.date.available | 2018-10-18T07:04:29Z | |
| dc.date.issued | 2012-03 | |
| dc.description.abstract | The oxidation of olefin compounds to equivalent epoxides or oxides using metal oxides as catalyst is an important step in the manufacturing of large quantities of fine and pharmaceutical grade chemicals. The chemical property of vanadium as metal in its oxide state is of interest particularly in application during o le e oxidation. Well-defined metal oxide nanostructures on the walls of carbon nanotubes (CNTs) are attractive as catalyst in the oxidation reaction because of their high specific surface area and formation of novel composite material with enhanced physical and catalytic properties. In this work, a thin layer of VxOy- " -Al2O3 # # $ * , capability. Metal oxide nanocomposite VxOy/CNT was prepared by wet impregnation method dispersed in sol, AlOOH. It was then coated on the surface of support through sol-gel technique. Factors that affect the preparation of defect free coating such as type of binder, time for the addition of binder to sol and surface treatment of the support, were investigated. The physical and chemical properties of the unsupported and supported membrane were characterized using different techniques such as SEM, TEM, FTIR, TGA, AFM, XRD and nitrogen adsorptiondesorption. Design of experiments (DOE) was applied to optimize the styrene oxidation conversion and benzaldehyde selectivity using the prepared membrane and nanocomposite catalyst. The optimal oxidation conditions were achieved at reaction $ +' $ difference of 1.5 bar, molar ratio of H2O2/styrene of 1.5:1 and loading of 30 wt. % catalyst on membrane. These conditions resulted in maximum styrene conversion of 25.6% and benzaldehyde selectivity of 84.9%. In the case of nanocomposite catalyst (VxOy/ -Al2O3), optimum oxidation conditions were reaction temperature of 62.74 '-*' molar ratio of H2O2/styrene of 2.7:1 and catalyst loading of 0.34 g for maximal styrene conversion of 68.23% and maximum benzaldehyde selectivity of 57.32%. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/6802 | |
| dc.language.iso | en | en_US |
| dc.publisher | Universiti Sains Malaysia | en_US |
| dc.subject | Mixed matrix vanadium oxide catalytic | en_US |
| dc.subject | nanocomposite membrane | en_US |
| dc.title | Mixed Matrix Vanadium Oxide Catalytic Nanocomposite Membrane For Styrene Oxidation | en_US |
| dc.type | Thesis | en_US |
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