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本文主要讨论了低温等离子体净化NOx技术,阐述了等离子体净化NOx的原理,并结合光谱分析仪浅析了低温等离子体、还原催化剂对NOx的作用以及混合气成分对NOx净化的影响规律。本文还论述了低温等离子体(NTP)与选择催化还原(SCR)相结合的系统处理柴油机NOx的优势,以及SCR与NTP技术相互结合后的NTP助SCR技术的运用及发展前景。 相似文献
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低温等离子体协同催化技术在挥发性有机物(VOCs)治理中因具有反应高效、反应条件温和、设备简易等优点而受到广泛的研究和应用。文章介绍了低温等离子体协同催化降解VOCs的基本原理、技术研究进展,简述了低温等离子体的高反应活性在与催化剂的高反应选择性结合后所产生的协同作用,二者的结合不但提高了VOCs的降解效率、减少有害副产物生成,还弥补了单一使用低温等离子体技术的高能耗、副产物多的缺陷。此外,分析了低温等离子体与催化剂的联合方式及特点、低温等离子体与催化剂之间的相互作用和影响以及低温等离子体联合不同类型催化剂的协同原理。指出了研究中对完整机理分析的欠缺以及应用过程中对中间过程监测分析的困难,这也是低温等离子体协同催化降解挥发性有机物研究中的重要内容。 相似文献
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综述了空气中氮氧化物的类型、危害及脱除方法。空气中氮氧化物主要为NO、N2O和NO2,化石燃料和植物体的燃烧以及土壤和动物排泄物中含氮化合物的转化是其主要来源,NOx是酸雨和雾霾天气形成的主要原因之一,严重影响人类健康。选择性催化还原技术通过氨等还原剂和催化剂的共同作用将NOx还原成N2和H2O,选择性非催化还原技术利用氨等还原剂在高温环境下的还原能力实现NOx的脱除。传统NOx脱除技术存在脱除效率不高和易产生二次污染的缺点。微波放电技术利用微波放电产生高能电子使NOx直接分解生成N2,微波碳热还原技术利用微波辐照活性炭的热效应可以显著提高炭对NOx的脱除能力,对NO脱除率高于96%。以微波为基础的脱硝技术在工业催化脱硝领域中的应用研究表明,结合催化剂、微波作用等手段实现工业高效脱除氮氧化物是一种较为理想的实现方式,应用前景良好。 相似文献
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稀燃汽车尾气中氮氧化物的催化消除技术 总被引:3,自引:0,他引:3
稀薄燃烧(简称稀燃)技术能够使燃料在发动机内充分燃烧,既提高了燃油的经济性,同时又减少了温室气体CO2的排放,因而是一项节能减排的重要技术.但在稀燃条件下氧气大量过剩,加剧了三效催化剂对还原剂的催化氧化,降低了还原剂对NOx催化还原的效率.目前,国际上对稀燃气氛下NOx的消除主要采用NO直接分解、选择性催化还原(SCR... 相似文献
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Zhenzhen Guan Jianxing Ren Dezhen Chen Liu Hong Fangqin Li Du Wang Yuanhuang Ouyang Yang Gao 《Korean Journal of Chemical Engineering》2016,33(11):3102-3108
NOx removal from flue gas using direct current (DC) narrow pulsed discharge-induced non-thermal plasma (NTP) was experimentally investigated. Factors such as additives, NOx initial concentrations, residence time, reaction temperatures inside the NTP reactor, and so on were investigated to evaluate their effects on NOx removal efficiencies. The focus was on the effects of additives containing amino groups. The results showed that H2O addition enhanced NOx removal, NH3 could further increase the NOx removal efficiencies under the same conditions without an obvious NH3 slip, and N2H4 was the most effective additive by reducing NO x to N2. X-Ray diffraction (XRD) analysis of the products collected from the NTP reactor demonstrated that NOx removal inside the NTP reactor was mainly based on NOx oxidation when ammonia or H2O was used as an additive, while NOx removal was mainly based on NOx reduction with the N2H4 additive. 相似文献
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Catalytic Reduction of Nitrogen Oxides in Automotive Exhaust Containing Excess Oxygen by NOx Storage-Reduction Catalyst 总被引:2,自引:0,他引:2
Shin'ichi Matsumoto 《CATTECH》2000,4(2):102-109
Automotive catalyst technology is now faced with very difficult problems. As a result of automakers' efforts to produce more efficient and lower-emission vehicles, lean-burn gasoline engines have been introduced into the market. While these are much more efficient than the conventional engines, the NOx removal has become significantly more difficult. After enormous efforts, we succeeded to solve the problem by inventing a new class of catalyst. Here, our challenge to develop the new catalyst that stores and then reduces NOx is described. The catalyst made it possible for emissions of lean-burn engines to meet the strict NOx regulations. 相似文献
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燃煤锅炉烟道气产生的烟尘是造成大气污染的主要原因之一,其主要成份是有害的SO2和NOX。但是脱硫脱硝两个催化过程相互影响,所以烟道气治理的发展方向是脱硫脱硝一体化技术。按机理的不同,将烟道气脱硫脱硝一体化技术分为两类:联合脱硫脱硝技术和同时脱硫脱硝技术,文章综述了目前国内外开发的各种一体化工艺。 相似文献
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Yunxiang Nie Xujun Wang Jinfeng Dai Chi Wang Dedong He Yi Mei 《American Institute of Chemical Engineers》2021,67(8):e17236
Removing SO2 and NOx released from middle and small-scaled coal-burning boiler is one important strategy for air pollution control. Herein, we first report a novel process on simultaneous eliminating SO2 and NOx at low temperature, by employing large scale and cheap sources of phosphorus sludge and phosphate rock slurry. The results showed that 100% desulfurization and denitrification efficiency can be obtained, and there exhibited a significant mutual-promoting effect between SO2 and NOx abatement processes. Based on characterizations and theoretical calculation results, it was found that the active substances produced by the interaction of sulfur and nitrogen species played a significant role in promoting the removal of SO2 and NOx. Compared with traditional purification technology, this process can achieve simultaneous desulfurization and denitrification with no discharge of secondary pollutants, and can be regarded as a new and economic technology for efficient removal of SO2 and NOx in industrial scale. 相似文献
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