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| Thesis Name： |
Oxidation of Propane over Transition Metallic Oxide |
| Usage： |
chemistry |
| Keyword： |
Carbon nanotubes,Propane oxidation reaction |
| Remarks： |
[Abstract]
Owing to the properties of lower density, larger specific surface area, unique
structure and adsorption, carbon nanotubes (CNTs) has become attractive and
extensively applied in many researcher groups. In recent literatures, it has
an excellent application in catalysis to use CNTs as a support in different
catalytic reactions.
In this study, CNTs are used as a support, and the supported metal oxide
catalysts are prepared by impregnation method to perform with the propane
oxidation reaction. Upon the surface treatment on CNTs, the original catalysts
and the amorphous carbon on CNTs can be removed efficiently and the purity of
CNTs can be improved, specific surface area of CNTs and carboxyl groups can be
increased and produced to make CNTs more hydrophilic. To analyze the effect of
different contents of supported metal (vanadium, molybdenum and chromium)
oxide on the CNTs, BET surface area, TGA, XRD and Raman will be used to
characterize the structural information of CNTs. From the results, the surface
metal oxides may be formed as V2O5, Cr2O3 and MoO3 crystallites, and metal
oxide layers on CNTs surface can be coexisted on the CNTs surface.
The concentration of reaction products was detected by GC analysis and
determine that the products are propene and by-products, such as CO, CO2, CH4,
C2H6 etc. In the catalytic results, the supported chromium oxide catalysts
possess a higher conversion and yields among the supported metal oxide
catalysts. However, the supported molybdenum oxide catalysts possess a higher
selectivity. By increasing temperature, the reaction conversion increases and
selectivity goes lower. With the increase of the oxygen feed ratio, the by-
products CO and CO2 become increasing. In addition, the propane conversion
increases with increasing surface metal oxide concentration in the catalysts
and drop off with further increasing the coverage of surface metal oxide.
Thus, the catalyst properties are related to the concentrations of metal oxide
additive.
In the propane oxidation reaction, the thermal stability of CNTs used as a
support is higher than those on active carbon support, and furthermore, it
possesses higher catalytic effect at higher temperature condition. |
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| City: |
Dalian |
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