| Summary: | 博士 === 國防大學中正理工學院 === 國防科學研究所 === 91 === The methane catalytic combustion by means of Pd noble metal catalyst but it still has something to improve. At the same time, it is worthy to study the high temperature catalyst, developed to solve the thermal stability of methane combustion on high temperature environment. In this thesis, the metal supported (Pd/TiO2- Al2O3), hexaaluminates (SLMA, Sr0.8La0.2MnAl11O19；SBLMA, Sr0.3Ba0.5La0.2MnAl11O19；BLMA, Ba0.8La0.2MnAl11O19) and honycomb catalysts were prepared by impregnation, copricipitation and wash coating method, respectively,. The designed micro-reactor was used to the methane catalytic combustion experiment and to study the high temperature catalytic activity with combustion kinetics mechanisms. Through examining the characterization with various tools (XRD, BET, SEM, TEM, TPR and XPS), not only those phase transfer during combustion, but also their mechanism of kinetics and deactivation was investigated in this study. At the same time, the drawback of hexaluminate formula can be study by mean of the methane combustion reaction curve and analysis to regard as catalytic combustor reference in the industry.
On the combustor design and mass diffusion effect study, the immerse noble metal Pd-Rh honycomb catalyst was used to simulate the effect of the different stoichiometric fuel-to-air ratio on the mass transfer. At the same time, the 250 mm catalyst combustor was scaled up in accordance with the small scale honeycomb catalyst on methane catalytic combustion. The results from the mass balance calculation showed that the emission concentrations of the air pollutants (CO: 18 ppm, NOx: 6 ppm, UCH: 16 ppm) meet the ultra-low emission standard , when the inlet and exit temperature was controlled between 400℃ and 800℃.
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