Fe_2O_3/沸石催化剂非均相类Fenton湿法脱硝实验研究
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摘要
为开发一种简单经济的湿法脱硝新工艺,采用浸渍法制备沸石载体负载Fe_2O_3的非均相类Fenton催化剂,并对其进行表征,同时考察了H_2O_2浓度、初始pH、催化剂质量浓度和反应温度对Fe_2O_3/沸石催化剂非均相类Fenton湿法脱硝效率的影响。结果表明,Fe_2O_3/沸石催化剂具有较大的比表面积,载体结构没有改变,活性组分Fe_2O_3均匀分散在载体上; Fe_2O_3/沸石催化剂具有明显的催化活性; H_2O_2浓度、初始p H、催化剂质量浓度和反应温度在最佳条件下,NO的脱除效率达52%;催化剂具有较好的稳定性,循环使用5次依然有48%左右的NO脱除效率。
In order to develop a simple and economical wet denitrification process,zeolite supported Fe_2O_3,a heterogeneous Fenton-like catalyst,is prepared through impregnation method and is then characterized. Meanwhile,the effects of H_2O_2 concentration,initial p H,catalyst dosage and reaction temperature on the efficiency of Fe_2O_3/zeolite catalyst in wet denitrification by heterogeneous Fenton-like method are investigated.The results show that the catalyst has a larger specific surface area,the structure of the carrier remains unchanged,and the active component Fe_2O_3 disperses evenly on the supporter. The of Fe_2O_3/zeolite catalyst has obvious catalytic activity. The removal efficiency of NO will reach 52% if H_2O_2 concentration,initial p H,catalyst dosage and reaction temperature all are set at theie own optimal values.NO removal efficiency is still around 48% after the catalyst has been used for 5 times,representing a good stability.
In order to develop a simple and economical wet denitrification process,zeolite supported Fe_2O_3,a heterogeneous Fenton-like catalyst,is prepared through impregnation method and is then characterized. Meanwhile,the effects of H_2O_2 concentration,initial p H,catalyst dosage and reaction temperature on the efficiency of Fe_2O_3/zeolite catalyst in wet denitrification by heterogeneous Fenton-like method are investigated.The results show that the catalyst has a larger specific surface area,the structure of the carrier remains unchanged,and the active component Fe_2O_3 disperses evenly on the supporter. The of Fe_2O_3/zeolite catalyst has obvious catalytic activity. The removal efficiency of NO will reach 52% if H_2O_2 concentration,initial p H,catalyst dosage and reaction temperature all are set at theie own optimal values.NO removal efficiency is still around 48% after the catalyst has been used for 5 times,representing a good stability.
引文
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[15]Sun S,Lemley A T.p-Nitrophenol degradation by a heterogeneous Fenton-like reaction on nano-magnetite:Process optimization,kinetics,and degradation pathways[J].Journal of Molecular Catalysis A:Chemical,2011,349:71-79.
[2]赵毅,韩育宏,王涵.H_2O_2氧化技术在燃煤烟气净化中的研究进展[J].河北大学学报(自然科学版),2016,(6):614-619.
[3]Chien T W,Chu H.Removal of SO2and NO from flue gas by wet scrubbing using an aqueous Na ClO2solution[J].Journal of Hazardous Materials B,2000,80:43-57.
[4]Fang Ping,Cen Chaoping,Wang Xinming,et al.Simultaneous removal of SO2,NO and Hg0by wet scrubbing using urea+KMn O4solution[J].Fuel Processing Technology,2013,106:645-653.
[5]Wang Zhihua,Zhou Junhu,Zhu Yanqun,et al.Simultaneous removal of NOx,SO2and Hg in nitrogen flow in a narrow reactor by ozone injection:Experimental results[J].Fuel Processing Technology,2007,88(8):817-823.
[6]Khan N E,Adewuyi Y G.Absorption and oxidation of nitric oxide(NO)by aqueous solutions of sodium persulfate in a bubble column reactor[J].Industrial&Engineering Chemistry Research,2010,49(18):8749-8760.
[7]Liu Yangxian,Zhang Jun,Sheng Changdong,et al.Simultaneous removal of NO and SO2from coal-fired flue gas by UV/H_2O_2advanced oxidation process[J].Chemical Engineering Journal,2010,162(3):1006-1011.
[8]Liu Yangxian,Zhang Jun,Pan Jianfeng,et al.Investigation on the removal of NO from SO2-containing simulated flue gas by an ultraviolet/Fenton-like reaction[J].Energy&Fuels,2012,26(9):5430-5436.
[9]Guo Ruitang,Pan Weiguo,Zhang Xiaobo,et al.Removal of NO by using Fenton reagent solution in a lab-scale bubbling reactor[J].Fuel,2011,90(11):3295-3298.
[10]Zhao Yi,Wen Xueyou,Guo Tianxiang,et al.Desulfurization and denitrogenation from flue gas using Fenton reagent[J].Fuel Processing Technology,2014,128:54-60.
[11]Zhao Yi,Guo Tianxiang,Chen Zhouyan.Experimental study on simultaneous desulfurization and denitrification from flue gas with composite absorbent[J].Environmental Progress&Sustainable Energy,2011,30(2):216-220.
[12]Zhou C S,Sun L S,Zhang A C,et al.Elemental mercury(Hg0)removal from containing S02/NO flue gas by magnetically separable Fe2.45Ti0.5504/H202advanced oxidation processes[J].Chemical Engineering Journal,2015,273:381-389.
[13]Zhou C S,Sun L S,Zhang A C,et al.Fe3-xCuxO4as highly active heterogeneous Fenton-like catalysts toward elemental mercury removal[J].Chemosphere,2015,125:16-24.
[14]Zhou C S.Wang B,Ma C,et al.Gaseous elemental mercury removal through heterogeneous Fenton-like processes using novel magnetically separable Cu0.3Fe2.7-xTixO4catalysts[J].Fuel,2015,161:254-261.
[15]Sun S,Lemley A T.p-Nitrophenol degradation by a heterogeneous Fenton-like reaction on nano-magnetite:Process optimization,kinetics,and degradation pathways[J].Journal of Molecular Catalysis A:Chemical,2011,349:71-79.