Effect of SO2 on catalytic performance of rare earth concentrate catalyst for NH3-SCR denitrification

被引：0
作者：
Jiao K. [1 ,2 ]
Zhao Y. [1 ]
Wu W. [1 ,2 ]
Wang Z. [2 ]
Gong Z. [1 ,2 ]
机构：
[1] School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, 014010, Inner Mongolia
[2] Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Baotou, 014010, Inner Mongolia
来源：
Huagong Xuebao/CIESC Journal | 2019年 / 70卷 / 12期
关键词：
Catalyst activity; NH[!sub]3[!/sub] adsorption; Rare earth concentrate catalyst; SO[!sub]2[!/sub; Sulfur resistance;
D O I：
10.11949/0438-1157.20190641
中图分类号：
学科分类号：
摘要：
Sulfur resistance is a key indicator for evaluating catalyst performance during denitration. It is important to study the effect of SO2 on the physicochemical properties of catalysts. The rare earth concentrate catalyst was obtained by roasting the Bayan Obo rare earth concentrate. Using the sulfur resistance test bed of the catalyst and combining scanning electron microscope (SEM), Brunner Emmett Teller(BET), X-ray diffraction (XRD) and in situ Fourier transform infrared spectroscopy (FT-IR), the adsorption of SO2 on the catalyst surface under the atmosphere of O2, NH3 and NO, as well as the influence of different SO2 concentrations on catalytic denitrification were analyzed. The results show that SO2 can significantly promote the denitrification performance of rare earth concentrate catalysts. The NO conversion rate increased from 28% to 50% at 300℃ and increased from 42% to 75% at 350℃. SEM, BET and XRD results illustrated that the surface structure and chemical composition of the catalyst remain unchanged before and after denitrification. The rare earth concentrate had good sulfur resistance. The FT-IR results verified that the adsorption of SO2 increased B acid sites on the surface of the rare earth concentrate catalyst. The adsorption capacity of the catalyst for NH3 was enhanced, contributing to increase catalyst activity. The results can provide valuable basic data reference for the anti-sulfur performance of the Bayan Obo rare earth concentrate catalyst NH3-SCR denitrification application process. © All Right Reserved.
引用
收藏
页码：4645 / 4653
页数：8
相关论文
共 32 条
[1]  
Zhang M.H., Huang B.J., Jiang H.X., Et al., Research progress in the SO<sub>2</sub> resistance of the catalysts for selective catalytic reduction of NO<sub>x</sub>, Chinese Journal of Chemical Engineering, 25, 12, pp. 1695-1705, (2017)
[2]  
Liu J.H., Yang X.B., Zhang C., Et al., Effect of Fe<sub>2</sub>O<sub>3</sub> on surface properties and activities of V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> catalysts, CIESC Journal, 67, 4, pp. 1287-1293, (2016)
[3]  
Guo F., Yu J., Li C.M., Et al., In situ preparation of mesoporous V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> catalyst by sol-gel method and its performance for NH<sub>3</sub>-SCR reaction, CIESC Journal, 68, 10, pp. 3747-3754, (2017)
[4]  
Li J.H., Chang H.Z., Ma L., Et al., Low-temperature selective catalytic reduction of NO<sub>x</sub> with NH<sub>3</sub> over metal oxide and zeolite catalysts-a review, Catalysis Today, 175, 1, pp. 147-156, (2011)
[5]  
Xiong Z.B., Peng B., Zhou F., Et al., Magnetic iron-cerium-tungsten mixed oxide pellets prepared through critic acid sol-gel process assisted by microwave irradiation for selective catalytic reduction of NO<sub>x</sub> with NH<sub>3</sub>, Powder Technology, 319, 1, pp. 19-25, (2017)
[6]  
Zhuang K., Zhang Y.P., Huang T.J., Et al., Sulfur-poisoning and thermal reduction regeneration of holmium-modified Fe-Mn/TiO<sub>2</sub>, catalyst for low-temperature SCR, Journal of Fuel Chemistry and Technology, 45, 11, pp. 1356-1364, (2017)
[7]  
Wu B.J., Liu X.Q., Xiao P., Catalytic performance of MnO<sub>x</sub>-WO<sub>3</sub>/TiO<sub>2</sub> catalyst for selective catalytic reduction of NO<sub>x</sub> with NH<sub>3</sub> and its tolerance towards SO<sub>2</sub>, Chemical Research in Chinese Universities, 25, 6, pp. 914-919, (2009)
[8]  
Kijlstra W.S., Biervliet M., Poels E.K., Et al., Deactivation by SO<sub>2</sub> of MnO<sub>x</sub>/Al<sub>2</sub>O<sub>3</sub> catalysts used for the selective catalytic reduction of NO with NH<sub>3</sub> at low temperatures, Applied Catalysis B: Environmental, 16, 4, pp. 327-337, (1998)
[9]  
Jiang B.Q., Wu Z.B., Liu Y., Et al., DRIFT study of the SO<sub>2</sub> effect on low-temperature SCR reaction over Fe-Mn/TiO<sub>2</sub>, The Journal of Physical Chemistry C, 114, 11, pp. 4961-4965, (2010)
[10]  
Wu Z.H., Jin R.B., Wang H.Q., Et al., Effect of ceria doping on SO<sub>2</sub> resistance of Mn/TiO<sub>2</sub> for selective catalytic reduction of NO with NH<sub>3</sub> at low temperature, Catalysis Communications, 10, 6, pp. 935-939, (2009)
1234