摘 要：大氣污染是工業污染中最突出的問題。工業污染物中的S02，NOx（90%為NO），CO，CO2等對人類生存環境造成了極大程度的威脅，其中NOx不僅會形成酸雨、化學煙霧，還是溫室氣體中的一種，NOx的污染會導致人類多種疾病。如何能夠經濟、高效、節能、環保的去除NOx一直是全球相關科學家致力于的難題。

　　　目前，NH3選擇性催化還原（SCR）工藝脫除煙氣中NOx的技術以用于工業化生產，但是NH3易泄漏，與煙氣中的SO3可形成硫酸銨， 從而引起空預器、除塵器后續設備的嚴重積垢， 甚至未反應的氨沾染飛灰，同時其設備投資大、操作難度高，從而限制它的工業應用。因此，尋求更高效、更經濟的煙氣脫硝技術成為必然。本文在借鑒前人脫硝方法的基礎上，利用活性炭對煙氣脫硝進行了相關研究，得到了一定結果?；钚蕴渴且环N具有高度發達的孔隙結構和巨大的比表面積的材料，因而具有很強的吸附性，加之活性炭表面含有多元含氧官能團，為作為催化劑高效脫硝提供了有利條件。本文的研究工作如下：

　　　論述研究控制NOx排放技術的意義；綜述控制NOx排放技術的發展與現狀；在模擬煙氣氣氛下，利用固定床反應器對煤質活性炭進行NOx脫除性能的實驗考查。

　　　研究結果標明：

　　　1）活性炭作為催化劑，在還原劑NH3和O2共存下NO的轉化率可達到50%左右，且催化效果相對穩定。

　　　2）200℃為活性炭催化效率的轉折點，200℃之前NO轉化率隨溫度升高逐漸降低，在35℃平均轉化率能達到88.5%。

　　　H2O的存在會阻礙活性炭表面的催化反應的進行，但隨溫度的上升其負面影響會減小。

　　　SO2濃度不高于900ppm時活性炭為催化劑的SCR脫硝效率較大，濃度高于900ppm，SO2的存在將抑制NO的催化反應。

　　　對于煤質活性炭而言，在一定范圍內，比表面積越大，其催化還原NO的效率越高。

　　　比較SEM圖發現，表面積大并擁有發達的孔徑結構（特別是大中孔）的活性炭催化效果較優。

　　　之后，在模擬煙氣氣氛下，利用固定床反應器對使用其他活性炭進行相同實驗，對比實驗結果。并利用比表面積和孔容測定（BET）、掃面電鏡（SEM）等分析手段對活性炭進行評價。

關鍵詞：煙氣脫硝；活性炭；氮氧化物

Abstract：The high-speed development of economy brings about serious environment pollution, such as atmosphere pollution which is the most prominent one. Industrial gaseous emission such as S02, NOx（NO accouts for 90%）,CO and CO2 threatened people's living conditions, among which NOx is not only the cause of acid rain and photochemical smog but also a main kind of green-house gas. To remove NOx economically with efficiency without hurting the environment becomes a tough task that world-wide scientist should committed to. In this paper, we focus the main research on the NOx removal. 

　　　Selective catalytic reduction of NOx with NH3 (SCR) technique has been widely put into use, but problems still remain because of the leakage of NH3 which will result in pipe jam. Besides, high cost of equipment and hard operation conditions also restrict its use. Therefore, finding a better method of removing NOx become inevitable. Based on the previous research, we do research on dinitrification by active coke and get some good result. Active coke is a kind of material who has highly developed porous structure and plenty of hydrogen and oxygen functional groups on its surface, which provides better conditions as the catalyst of NOx removal. The main tasks of the paper are as followed: 

　　　With AC as catalyst, the NO conversion rate could reach 50% in the coexistence of NH3 and O2, and the effect is relatively stable.

　　　200℃ is the turning point for the efficiency of AC as catalyst. The NO conversion rate decreases with the increasing temperature, which reached 88.5% at 35℃.

　　　The existence of H2O will hinder the efficiency of AC as catalyst, but the rising temperature reduces the negative effects.

　　　When the flue gas has SO2 in it, the dinitrification efficiency would be quite different. When the concentration of SO2 is no more than 900ppm, the conversion rate is pleasant. Otherwise, the negative effect becomes greater.

　　　For AC, within a certain range, the greater the specific surface area, the higher efficiency of catalytic reduction of NO.

　　　According to the SEM graph, the larger surface area and pore structure, the better performance of AC as catalyst.

　　　Discuss about the significance of scientific research about controlling NOx emissions technology; review the development and the status of NOx emissions control technology.

　　　Using fixed bed reactor for experimental test to evaluate the performance of AC removing NOx in simulated flue gas atmosphere. The result indicate:

　　　Afterwards, do the same experiment with another kind of AC as compared experiment.

　　　Evaluate AC by scanning electron microscopy surface and other methods.

Keywords: flue gas denitrification; actived carbon(AC); nitrogen oxides