SO2 poisoning and regeneration of Mn-Ce/TiO2 catalyst for low temperature NOx reduction with NH3

被引:108
作者
Sheng Zhongyi [1 ]
Hu Yufeng [1 ]
Xue Jianming [1 ]
Wang Xiaoming [1 ]
Liao Weiping [2 ]
机构
[1] Guodian Sci & Technol Res Inst, Ctr Res & Dev, Nanjing 210031, Jiangsu, Peoples R China
[2] Nanjing Normal Univ, Coll Energy & Mech Engn, Nanjing 210042, Jiangsu, Peoples R China
关键词
low temperature SCR; Mn-Ce/TiO2; deactivation; regeneration; water washing; rare earths; OXIDE CATALYSTS; MIXED OXIDES; PERFORMANCE; SCR; DEACTIVATION; OXIDATION; ADSORPTION; AMMONIA; CERIA; DRIFT;
D O I
10.1016/S1002-0721(12)60111-2
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
SO2 poisoning and regeneration of Mn-Ce/TiO2 catalyst prepared by a novel co-precipitation method for low temperature selective catalytic reduction (SCR) of NOx with ammonia were investigated in this study. When 700 ppm SO2 was fed in, the Mn-Ce/TiO2 catalyst had good resistance to SO2, but the deactivation of Mn-Ce/TiO2 poisoned by SO2 still occurred. The NO conversion of Mn-Ce/TiO2 (the molar ratio of Ce to Ti is 0.075) catalyst decreased from 92.5% to 34.6% in 13 h. Characterizations of fresh and SO2-poisoned Mn-Ce/TiO2 catalysts were carried out by Brunauer-Emmett-Teller method (BET), ion chromatography (IC), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). The characterized results indicated that the deposition of sulfates and nitrates on the surface made the catalyst deactivated. Water washing, thermal regeneration and reductive regeneration were used to regenerate the deactivated Mn-Ce/TiO2. And water washing showed best performance on the regeneration of poisoned catalysts, especially with ultrasonic vibration. The Mn-Ce/TiO2 catalyst showed high stability under a series of deactivation-regeneration experiments for ten cycles.
引用
收藏
页码:676 / 682
页数:7
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