本文選題：Mn-Fe尖晶石 + NH_3-SCR反應(yīng)��； 參考：《南京理工大學(xué)》2015年碩士論文

【摘要】：大氣污染現(xiàn)階段已經(jīng)成為我國環(huán)境污染最為突出的問題之一,與人們健康訴求的矛盾突出,其中燃煤煙氣導(dǎo)致的大氣污染較為嚴(yán)重。新修訂的《中華人民共和國大氣污染防治法(修訂草案)》重點(diǎn)提出了大氣污染的源頭治理和科技治霾,旨在改善我國大氣污染現(xiàn)狀。因此,開發(fā)出燃煤煙氣協(xié)同脫硝除汞技術(shù)顯得尤為重要。本論文選取鐵基尖晶石作為催化劑,考察了Mn-Fe尖晶石的氨選擇性催化還原氮氧化物(NH3-SCR)性能,并通過模擬L-H和E-R反應(yīng),初步探究其NH3-SCR反應(yīng)機(jī)理。同時,研究氣態(tài)零價汞在Mn-Fe尖晶石表面的化學(xué)吸附以及煙氣組分影響其吸附零價汞的作用機(jī)制。最后,通過水洗和熱再生方法,恢復(fù)Mn-Fe尖晶石的NH3-SCR反應(yīng)活性,同時對化學(xué)還原的零價汞集中回收處理,實現(xiàn)催化劑的再生。(1) Mn-Fe尖晶石在100℃～200℃范圍內(nèi),具有良好的NH3-SCR反應(yīng)活性,但其抗水性不理想。在Mn-Fe尖晶石表面,吸附態(tài)的NH3以及吸附態(tài)的NO均參與NH3-SCR反應(yīng),Mn-Fe尖晶石NH3-SCR反應(yīng)通過L-H機(jī)制和E-R機(jī)制兩種途徑還原NO。(2) Mn-Fe尖晶石在100℃～200℃范圍內(nèi),具有較高的零價汞吸附容量,低溫會促進(jìn)零價汞的吸附。一定量的S02在其表面形成新的反應(yīng)活性位,會促進(jìn)零價汞的吸附。而H2O會與零價汞競爭吸附活性位,從而抑制零價汞的吸附。(3) Mn-Fe尖晶石在100℃～200℃溫度范圍內(nèi)可以實現(xiàn)NH3-SCR反應(yīng)和零價汞化學(xué)吸附的兼容性。通過水洗和熱處理的方法,可以實現(xiàn)Mn-Fe尖晶石催化劑的循環(huán)再生。
[Abstract]:Air pollution has become one of the most prominent problems in China's environmental pollution, and the contradiction between the people's health demands is prominent, and the air pollution caused by coal-fired flue gas is more serious. The newly revised People's Republic of China air pollution prevention and control law (Revised Draft) focuses on the source control of air pollution and scientific and technological haze treatment. In order to improve the current situation of air pollution in China, it is very important to develop the technology of co - denitrification and removal of nitric oxide from coal-fired flue gas. In this paper, iron based spinel was selected as a catalyst to investigate the performance of ammonia selective catalytic reduction of nitrogen oxides (NH3-SCR) of Mn-Fe spinel, and the mechanism of NH3-SCR reaction was preliminarily explored by simulating the reaction of L-H and E-R. The chemical adsorption of gaseous zero valent mercury on the surface of Mn-Fe spinel and the effect of flue gas composition on the adsorption of zero valent mercury were studied. Finally, the NH3-SCR reaction activity of Mn-Fe spinel was restored by water washing and thermal regeneration. At the same time, the concentration of zero valent mercury in chemical reduction was reclaimed to achieve the regeneration of the catalyst. (1) Mn-Fe spinel In the range of 100 ~ 200 c, it has good NH3-SCR reaction activity, but its water resistance is not ideal. On the surface of Mn-Fe spinel, the adsorbed NH3 and the adsorbed NO are all involved in the NH3-SCR reaction. The Mn-Fe spinel NH3-SCR reaction reduces the NO. (2) Mn-Fe spinel in the range of 100 to 200 c through the L-H mechanism and the E-R mechanism. Higher zero valent mercury adsorption capacity, low temperature will promote the adsorption of zero valent mercury. A certain amount of S02 forms a new reactive active site on its surface, which will promote the adsorption of zero valent mercury. And H2O will compete with zero valent mercury to adsorb active sites and inhibit the adsorption of zero valent mercury. (3) Mn-Fe spinel can achieve NH3-SCR reaction within the temperature range of 100 to 200. Compatibility with zero valent mercury chemisorption. Regeneration of Mn-Fe spinel catalyst can be achieved by washing and heat treatment.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X701

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 唐幸福;李俊華;魏麗斯;郝吉明;;氧化還原沉淀法制備MnO_x-SnO_2催化劑及其對NO的NH_3選擇催化還原性能[J];催化學(xué)報;2008年06期

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本文編號：1936483