载体对Mn-Ce催化剂低温选择性催化还原脱硝性能的影响
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摘要
使用3种组成不同的钛白粉作为载体,采用浸渍法制备Mn-Ce/TiO_2,Mn-Ce/TiO_2-SiO_2,Mn-Ce/TiO_2-WO_3催化剂,采用XRD,BET,SEM等方法对催化剂的微观结构及形貌进行表征,探索SiO_2、WO_3的掺加对催化剂脱硝活性和抗硫性能的影响。结果表明:掺加SiO_2、WO_3有助于增大载体的比表面积及催化剂表面活性酸中心数量,催化剂的脱硝活性和抗硫性能得到提高;在空速为10 000 h~(-1)、反应温度为100℃的条件下,Mn-Ce/TiO_2催化剂上NO去除率仅为30%,Mn-Ce/TiO_2-SiO_2和Mn-Ce/TiO_2-WO_3催化剂上NO去除率分别为45%和50%;当反应气中含有150μL/L的SO_2时,在反应温度为150℃、反应时间为270 min的条件下,与不含SO_2时相比,Mn-Ce/TiO_2催化剂上NO去除率从80%降低至40%,Mn-Ce/TiO_2-SiO_2和Mn-Ce/TiO_2-WO_3催化剂上NO去除率从84%降至55%和70%。
Using three different kinds of titanium dioxide composites as carriers,Mn-Ce/TiO_2,Mn-Ce/TiO_2-SiO_2,Mn-Ce/TiO_2-WO_3 catalysts were prepared by impregnation and characterized by XRD,BET and SEM techniques.The effects of SiO_2 and WO_3 on denitration activity in low temperature SCR reaction and the sulfur resistance of the catalyst were investigated.The results showed that the addition of SiO_2 and WO_3 increased the specific surface area of the supports and the number of the surface active acidic sites of the catalyst,and the denitration efficiency and the sulfur resistance of the catalyst were improved.At the conditions of the space velocity of 10 000 h~(-1) and 100 ℃,the NO removal rate on Mn-Ce/TiO_2 catalysts was only about 30%,and the NO removal rate on Mn-Ce/TiO_2-SiO_2 and Mn-Ce/TiO_2-WO_3 catalyst was 45% and 50%,respectively.Within 270 min reaction,the NO removal rate on Mn-Ce/TiO_2 catalysts were reduced from 80% to 40% at 150℃ in presence of 150 μL/L SO_2,and Mn-Ce/TiO_2-SiO_2 and Mn-Ce/TiO_2-WO_3 catalyst decreased from 84% to 55% and 70%,respectively.
Using three different kinds of titanium dioxide composites as carriers,Mn-Ce/TiO_2,Mn-Ce/TiO_2-SiO_2,Mn-Ce/TiO_2-WO_3 catalysts were prepared by impregnation and characterized by XRD,BET and SEM techniques.The effects of SiO_2 and WO_3 on denitration activity in low temperature SCR reaction and the sulfur resistance of the catalyst were investigated.The results showed that the addition of SiO_2 and WO_3 increased the specific surface area of the supports and the number of the surface active acidic sites of the catalyst,and the denitration efficiency and the sulfur resistance of the catalyst were improved.At the conditions of the space velocity of 10 000 h~(-1) and 100 ℃,the NO removal rate on Mn-Ce/TiO_2 catalysts was only about 30%,and the NO removal rate on Mn-Ce/TiO_2-SiO_2 and Mn-Ce/TiO_2-WO_3 catalyst was 45% and 50%,respectively.Within 270 min reaction,the NO removal rate on Mn-Ce/TiO_2 catalysts were reduced from 80% to 40% at 150℃ in presence of 150 μL/L SO_2,and Mn-Ce/TiO_2-SiO_2 and Mn-Ce/TiO_2-WO_3 catalyst decreased from 84% to 55% and 70%,respectively.
引文
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[7] 赵梦梦,陈梦寅,张鹏举,等.共沉淀法掺杂SiO2对V2O5-WO3/TiO2催化剂SCR性能的影响[J].分子催化,2017,31(3):223-234
[8] 沈伯雄,邓黎丹,马娟,等.Mn-CeOx/钛基层柱黏土低温选择性催化还原催化剂的钙中毒研究[J].环境污染与防治,2011,33(3):1-5
[9] 邱赟,秦剑锋,鲁谦怀,等.脱硝催化剂载体WO3/TiO2的制备及表征[J].精细与专用化学品,2013,21(5):33-36
[10] 钟柳成,林赫,黄震.添加SiO2对钛基锰铈氧化物SCR催化剂性能的影响[J].现代车用动力,2013(1):35-42
[11] 刘树军,闫东杰,黄学敏,等.掺杂改性对Mn-Ce/TiO2低温SCR催化剂性能的影响[J].环境工程学报,2016,10(8):4403-4406
[2] 祝社民,李伟峰,陈英文,等.烟气脱硝技术研究新进展[J].环境污染与防治,2005,27(9):699-703
[3] Sreekanth P M,Peňa D A,Smirniotis P G.Titania supported bimetallic transition metal oxides for low-temperature SCR of NO with NH3[J].Industrial & Engineering Chemistry Research,2006,45(19):6444-6449
[4] 房晶瑞,吴彦霞,雷本喜,等.负载型Mn-Ce/TiO2催化剂的制备及其低温脱硝活性[J].环境工程学报,2014,8(2):636-640
[5] 吴碧君,肖萍,马进,等.MnOx-WO3/TiO2 用于NH3选择性催化还原NOx的性能与抗SO2毒性研究[J].中国电机工程学报,2010,30(11):62-67
[6] 马腾坤,房晶瑞,孙勇,等.TiO2载体掺杂对Mn-Ce/TiO2催化剂低温脱硝性能影响研究[J].燃料化学学报,2017,45(4):491-496
[7] 赵梦梦,陈梦寅,张鹏举,等.共沉淀法掺杂SiO2对V2O5-WO3/TiO2催化剂SCR性能的影响[J].分子催化,2017,31(3):223-234
[8] 沈伯雄,邓黎丹,马娟,等.Mn-CeOx/钛基层柱黏土低温选择性催化还原催化剂的钙中毒研究[J].环境污染与防治,2011,33(3):1-5
[9] 邱赟,秦剑锋,鲁谦怀,等.脱硝催化剂载体WO3/TiO2的制备及表征[J].精细与专用化学品,2013,21(5):33-36
[10] 钟柳成,林赫,黄震.添加SiO2对钛基锰铈氧化物SCR催化剂性能的影响[J].现代车用动力,2013(1):35-42
[11] 刘树军,闫东杰,黄学敏,等.掺杂改性对Mn-Ce/TiO2低温SCR催化剂性能的影响[J].环境工程学报,2016,10(8):4403-4406