本文選題：催化劑 + 低溫等離子體　； 參考：《西安建筑科技大學》2015年碩士論文

【摘要】：揮發(fā)性有機物(VOCs)是大氣污染的重要組成部分,對環(huán)境和人體健康會造成嚴重危害。隨著工業(yè)發(fā)展及人類生活水平要求的提高,尋求并使用經(jīng)濟高效的方法來治理VOCs成為當務之急。低溫等離子體技術(shù)所具有低費用、工藝簡單及適用范圍廣等優(yōu)點使其成為治理VOCs的重要研究方向,尤其在處理印刷、噴涂等行業(yè)具有濃度低、風量大特點的有機廢氣時展現(xiàn)出較好的優(yōu)勢。針對VOCs治理過程中降解不充分及產(chǎn)生副產(chǎn)物的問題,論文選取常用有機溶劑甲苯作為研究對象,制備了不同成分的催化劑,分別對低溫等離子體循環(huán)降解系統(tǒng)及催化聯(lián)合低溫等離子體循環(huán)降解系統(tǒng)處理吸附態(tài)甲苯進行了研究,考察了吸附存儲量、施加電壓、循環(huán)氣體流量、循環(huán)背景氣體等工藝參數(shù)及不同催化劑成分對甲苯降解效果的影響,并分析了催化劑的加入對降解程度、O3及N2O副產(chǎn)物的影響規(guī)律,為工業(yè)應用提供了理論基礎(chǔ)及設計依據(jù)。論文主要結(jié)論如下:(1)低溫等離子體循環(huán)降解系統(tǒng)處理甲苯的研究表明:COx產(chǎn)率和CO2選擇性隨著甲苯的吸附存儲量的增加而減小,但COx產(chǎn)量會增加;隨著施加電壓及循環(huán)氣體流量的增大,COx產(chǎn)率及CO2選擇性均會增大;氧氣做循環(huán)背景氣體時比空氣時對應的COx產(chǎn)率及CO2選擇性均有所增大。(2)催化聯(lián)合低溫等離子體循環(huán)降解系統(tǒng)處理甲苯的研究表明:催化劑的加入可顯著提高COx產(chǎn)率和CO2選擇性,氧氣為循環(huán)背景氣體時,提升幅度更大。相同條件下,不同催化劑成分對應COx產(chǎn)率排序為:CeMnAgCo,對應CO2選擇性排序為AgMnCoCe。雙組分復合型金屬氧化物催化劑Ce/Ag、Mn/Ag可以同時有效提升COx產(chǎn)率和CO2選擇性。(3)吸附態(tài)甲苯降解產(chǎn)物FT-IR圖譜分析表明,主要產(chǎn)物為CO2、H2O及少量的CO,副產(chǎn)物主要為O3;無催化劑時產(chǎn)物中殘留極微量甲苯,催化劑的加入可使甲苯全部被去除,同時減少CO和O3的排放;循環(huán)背景氣體為空氣時有N2O生成。(4)空氣為循環(huán)背景氣體時,催化劑的加入可抑制N2O的生成(Ce除外),對應N2O抑制性能大小為:CoMnAg無催化劑Ce;三組分復合型催化劑Ce/Ag/Co、Mn/Ag/Co在提高COx產(chǎn)率和CO2選擇性的同時能有效抑制N2O。催化劑的加入可以減少O3,催化劑對提升甲苯降解效果的能力與分解O3的能力沒有相關(guān)性。
[Abstract]:Volatile organic compounds (VOCs) are important components of air pollution, which can cause serious harm to environment and human health. With the development of industry and the improvement of human standard of living, it is urgent to seek and use economic and efficient methods to control VOCs. The low temperature plasma technology has the advantages of low cost, simple process and wide application scope, which makes it an important research direction in the treatment of VOCs, especially in the treatment of printing, spraying and other industries with low concentration. The organic waste gas with large air volume features shows a good advantage. In order to solve the problem of inadequate degradation and by-product production in the process of VOCs treatment, toluene, a common organic solvent, was selected as the research object, and catalysts with different compositions were prepared. The treatment of adsorbed toluene by low temperature plasma cycle degradation system and catalytic combined low temperature plasma body cycle degradation system was studied respectively. The adsorption storage capacity, applied voltage and circulating gas flow rate were investigated. The effects of process parameters such as cyclic background gas and different catalyst compositions on the degradation of toluene were analyzed. The effects of catalyst addition on the degradation degree of O _ 3 and N _ 2O by-products were analyzed, which provided the theoretical basis and design basis for industrial application. The main conclusions are as follows: (1) the study on the treatment of toluene by low temperature plasma system showed that the yield and selectivity of CO2 decreased with the increase of the amount of toluene adsorption and storage, but the yield of COx increased. With the increase of the applied voltage and the flow rate of the circulating gas, the yield of COx and the selectivity of CO2 will increase. When oxygen was used as the background gas, the corresponding COx yield and the selectivity of CO2 were increased. The results showed that the COx yield and CO2 selectivity could be significantly improved by the addition of the catalyst in combination with the low temperature plasma system for degradation of toluene. When oxygen is the background gas, the lift is greater. Under the same conditions, the order of COx yield and CO2 selectivity for different catalysts were: 1 CeMnAgCoand and AgMnCoCe respectively. The two-component composite metal oxide catalyst ce / AgM / Ag can effectively improve the yield of COx and the selectivity of CO2 at the same time. The FT-IR spectra of toluene degradation products in adsorbed state are analyzed. The main product is CO _ 2H _ 2O and a small amount of CO, and the by-product is mainly O _ 3. When there is no catalyst, the residual trace toluene in the product can be removed completely and the emission of CO and O _ 3 can be reduced by the addition of catalyst. When the circulating background gas is air, N2O is produced. 4) when the air is the circulating background gas, The addition of catalyst can inhibit the formation of N2O with the exception of ce, corresponding to the N2O inhibition performance of 1: CoMnAg without catalyst Ce.The three-component composite catalyst CeR / CoMN / Ag- / Co can effectively suppress N _ 2O while increasing the yield of COx and the selectivity of CO2. The addition of catalyst can reduce O _ 3, and the ability of the catalyst to improve the degradation of toluene is not related to the ability to decompose O _ 3.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X701;O643.36

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