【摘要】：低溫等離子體催化技術(shù)是近年來(lái)興起的一種治理廢氣的可行方法,與傳統(tǒng)的治理廢氣方法和工藝相比具有投資和運(yùn)行費(fèi)用較低、處理效率較高、處理時(shí)間較短、易于控制等優(yōu)點(diǎn)。國(guó)內(nèi)外眾多研究表明,利用等離子體技術(shù)處理大氣污染的應(yīng)用前景是十分廣闊的。但低溫等離子體技術(shù)反應(yīng)器的選擇、匹配和優(yōu)化;相關(guān)催化劑的選擇以及與反應(yīng)器的結(jié)合;反應(yīng)機(jī)理等方面還需要進(jìn)一步深入研究,使其聯(lián)合作用效果達(dá)到最佳,以利于大規(guī)模的工業(yè)化推廣,為人類的環(huán)保事業(yè)做出貢獻(xiàn)。氧化錳八面體分子篩(OMS-2)因具有多孔結(jié)構(gòu)、混合價(jià)態(tài)的錳離子以及溫和的表面酸堿性和優(yōu)良的離子交換性,使其對(duì)污染物,尤其是揮發(fā)性有機(jī)污染物(VOCs)具有獨(dú)特的去除效果,并且在適當(dāng)?shù)拇呋瘲l件下轉(zhuǎn)化率甚至可高達(dá)到100%。氧化錳八面體分子篩(OMS-2)的合成方法多種多樣,不同的合成方法對(duì)其催化效率具有很大影響;而在其中摻雜金屬離子在某些情況下可顯著提高其對(duì)污染物質(zhì)的轉(zhuǎn)化率以及目標(biāo)產(chǎn)物的選擇性,特別是摻雜貴金屬Ag、Pd等,效果更為優(yōu)異。本實(shí)驗(yàn)將等離子體與OMS-2結(jié)合來(lái)去除VOC,其中VOC以甲苯為例作為典型代表,探究了不同制作方法對(duì)催化劑催化效率的影響;研究了不同的輸入電壓、能量密度、氧氣含量等反應(yīng)條件對(duì)去除效率的影響。得到在5%的氧氣條件下,保持8kV左右的輸入電壓,可以獲得相對(duì)最優(yōu)的催化效率。隨后采用回流法和水熱法分別制作了不同Ag質(zhì)量分?jǐn)?shù)的Ag-OMS-2催化劑,在相對(duì)最優(yōu)的條件下考察了其催化效率,并做了比較和對(duì)照。發(fā)現(xiàn)在現(xiàn)有實(shí)驗(yàn)條件下3%的Ag-OMS-2催化劑具有相對(duì)最優(yōu)良的催化效率,而且回流法制得的催化劑普遍優(yōu)于水熱法制得的催化劑。實(shí)驗(yàn)還利用了一系列表征手段,如XRD和BET等,對(duì)各種不同方法制得的催化劑進(jìn)行了表征。表征數(shù)據(jù)也應(yīng)證了之前結(jié)論的正確性,為實(shí)驗(yàn)結(jié)論提供了有力佐證。而對(duì)低溫等離子體催化分解污染物機(jī)理的研究和在低溫等離子體氛圍中OMS-2催化劑的使用壽命和處理不同污染物的適應(yīng)性以及制作出更為優(yōu)異的低溫等離子體應(yīng)用到催化工業(yè)型反應(yīng)器依然是今后努力的方向和前進(jìn)的路線。
[Abstract]:Low temperature plasma catalytic technology is a feasible method to treat waste gas in recent years. Compared with the traditional waste gas treatment method and process, it has lower investment and operation cost, higher treatment efficiency and shorter treatment time. The advantages of ease of control, etc. Many studies at home and abroad show that the application of plasma technology in the treatment of air pollution is very broad. However, the selection, matching and optimization of low temperature plasma reactor, the selection of relevant catalysts and the combination with reactor; The reaction mechanism and other aspects need to be further studied in order to achieve the best effect of joint action in order to promote large-scale industrialization and contribute to the environmental protection cause of human beings. Manganese oxide octahedral molecular sieves (OMS-2) have the properties of porous structure, mixed valence manganese ions, mild surface acidity and alkalinity, and excellent ion exchange properties, which make them treat pollutants. Especially the volatile organic pollutant (VOCs) has a unique removal effect, and the conversion rate can be up to 100 under the appropriate catalytic conditions. The synthesis methods of manganese oxide octahedral molecular sieve (OMS-2) are various, and different synthesis methods have great influence on the catalytic efficiency of MNO _ 2 octahedral molecular sieve (OMS-2). In some cases, doping metal ions can significantly improve the conversion of pollutants and the selectivity of target products, especially the doping of precious metal Ag,Pd, the effect is better. In this experiment, plasma and OMS-2 were combined to remove VOC,. Toluene was taken as a typical example of VOC, and the effect of different preparation methods on catalytic efficiency of catalyst was investigated. The effects of different input voltage, energy density and oxygen content on the removal efficiency were studied. The optimal catalytic efficiency can be obtained by keeping the input voltage of 8kV at 5% oxygen. Ag-OMS-2 catalysts with different mass fraction of Ag were prepared by reflux method and hydrothermal method respectively. The catalytic efficiency of the catalyst was investigated under the relative optimum conditions and compared with that of the control. It is found that 3% Ag-OMS-2 catalyst has the best catalytic efficiency under the existing experimental conditions, and the catalyst prepared by reflux method is generally superior to that obtained by hydrothermal method. A series of characterization methods, such as XRD and BET, were used to characterize the catalysts prepared by different methods. The characterization data should also prove the correctness of the previous conclusions and provide strong evidence for the experimental conclusions. The mechanism of catalytic decomposition of pollutants by low temperature plasma, the service life of OMS-2 catalyst in low temperature plasma atmosphere, the adaptability of treating different pollutants and the preparation of better low temperature plasma were studied. The application of catalytic industrial reactor is still the direction of future efforts and the way forward.
【學(xué)位授予單位】：廣州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：X701

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