| Summary: | 碩士 === 國立臺北科技大學 === 環境工程與管理研究所 === 101 === Nitrogen oxides (NOX) are important precursors of acid rain and photochemical smog. Combustion controls and post-combustion controls are the two main categories for NOx emission reduction techniques. However, combustion controls along are not effective enough to achieve the regulation requirement in most cases. Therefore, adaptation of post-combustion controls to remove NOx from the exhausted stream is usually needed. Amongst all the pos-combustion techniques, SCR method is one of the common practices. Yet, during the process of most SCR method, the corrosive reductants can lead to further pollution. As a result, developing alternative control technology is of the highest priority to effectively reduce NOx emission for the industry.
This research used thecarbon-zeolite socony mobil (C-ZSM5) to absorb NO, and employedmicrowave discharge to assisted catalysis C-ZSM5. C-ZSM5 internalwasrapidly heatedto a high temperaturetoproduce an activehot spot,these activehotspot reduced NO in C-ZSM5, and NO converted toN2.
The results show that the conversion of NO to N2 increased with the amount of C-ZSM5 increased. The optimum conversion efficiency of NOcould reach above 90% with microwave power of 300W andamount of C-ZSM5 was 180g. Temperature of the C-ZSM5 rose gradually and reached to approximately 110℃under microwave power output was 300W after 15 minutes. The higher microwave power output was, the higher temperature of C-ZSM5was.
The adsorption on and desorption from C-ZSM5 concern with a porous system, that may differ from slit to spherical shaped properties. According to SEM and BET analysis, the C-ZSM5 was covered by the carbon materials successfully. However, the carbon material may causeholesobstruction, and then the specific surface area of C-ZSM5 was decreased. As the microwave power increased, the specific surface area of C-ZSM5 was increased. Accordingly, the C-ZSM5 was supposed to have larger micropore volume and specific surface area under 500 W of microwave power.
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