Catalytic Combustion of Methane over CuO/ZrO2-Al2O3 Catalysts Modified by MxOy (M = Y, Cr, Mg, Ce)

2013 Asian Journal of Chemistry  
In the field of methane combustion, the conventional thermal combustion is high temperature reaction. In the process, NOx can be produced, which can cause serious environment pollution 1,2 . In addition, the methane can not be completely burning which result in the emission of CO toxic gases and CH4 greenhouse gases.The catalytic combustion can control and eliminate the harmful gases of NOx, CO and not the complete combustion of hydrocarbon compounds 3, 4 , but it needs hard reaction conditions
more » ... and the key problem is the study of the catalyst with high catalytic activity in low-temperature range and stability in high-temperature range 5 . Now, many catalysts have shown excellent low-temperature catalytic activity. However, the problem of the stability of the catalyst in the high temperature range needs to be studied further. Transition metal oxides have an important promotion for the industrial catalysts and catalytic carriers. For example, ZrO2, which not only has favourable chemical properties, but also is ρ-type semiconductor, easy to produce oxygen vacancies. Zirconium oxide can also generate a strong electronic-interaction with the active component as support and has a greater effect on the properties in the catalytic oxidation, reduction and adsorption process 6 . ZrO2 is also an excellent high temperature ceramic and high-quality refractory materials 7 . Generally, calclined under different temperature, the ZrO2 can be existed in three different crystals. Therefore, in order to stabilize the ZrO2 crystal phase which has high stability under high temperature range, some stabilizer must be added in the ZrO2. The CaO, MgO and Y2O3 are preferred because of their similar
doi:10.14233/ajchem.2013.14636 fatcat:d6a5pgtclzhwzgge2pxchz3opa