| Abstract This dissertation consists two sections. The first section mainly dissusses about the effects of ceria in nonæ¢'hromia iron based CO high temperature shift catalyst. Currently, chromia iron based catalyst is still the most common in the water梘as shift reaction. But the poisonousness and the prohibitive material price of the chromia hold back the path leading to the industrial application. To solve the problems mentioned above, the research on the Fe~O.3æ¡ŸeO~ catalyst was carried out. By XRD, TPR, SEM, XPS and GC, the experimental results show that the adsorption of water on the surface of ceriaæ¢'ontaining Fe203 catalyst obeys Temkin Equation. When the ceria is added in, the adsorption heat of water on the surface of catalyst decreases, therefore, the catalytic activity is improved greatly. It has also been found that ceria can refine Fe20.3 grains and is riched on the surface of catalyst in the process of reduction, which lead to a decrease of the initial reductive temperature and an increase of the final reductive temperature. In the second section, the catalytic activity of YBa2Cu3O-~ for toluene combustion has been investigated. YBa2Cu30-8, known as high桾e superconductor, has recently gathered great attention, not only due to its electric and megnetie characteristics but also due to its intrinsic catalytic activity for oxidation. YBa,Cu3O~ can 2 work as both mild and deep oxidation catalysts,whieh is used to produce a wide range of industrial chemicals from hydrocarbons and is becoming important in the cleaning of emissions from combustion of carbonaceous fuels. In the complete oxidation of toluene, Y YBa0Cu;30> ~ exhibits high catalytic activity and high thermal stability. Compared with nobel metal catalysts, YBa2Cu3O-8also has remarkable lower material cost. With the advantages mentioned above, YBa-,Cu30.-8 could become a more promising catalyst of oxidation. |
PDF Full Text Request