铁铈钛复合氧化物催化剂的制备及其选择性催化还原NO的性能
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摘要
采用共沉淀法制备了一种新型催化剂——铁铈钛复合氧化物催化剂,研究了Fe掺加量、体积空速以及H2O和SO2的加入对其选择性催化还原NO性能的影响;采用XRD和SEM等手段对催化剂的结构和形貌进行了表征。表征结果显示,Fe的掺加使催化剂表面的颗粒更均匀,提高了催化剂的分散度。实验结果表明:以Ce(NO3)3,Fe(NO3)3·9H2O,TiOSO4·2H2O为原料、按n(Ce)∶n(Fe)∶n(Ti)=0.2∶0.8∶1配比制得的Ce0.2Fe0.8TiOx为催化剂,在反应温度250℃、反应时间3 h、体积空速25 000 h-1的条件下,NO去除率为99.8%,N2选择性为100%;Fe的掺加显著提高了Ce0.2Fe0.8TiOx催化剂的抗H2O和SO2的能力。
Fe-Ce-Ti composite oxide catalyst was prepared by coprecipitation method. The effects of Fe dosage,volume space velocity,H2O and SO2 addition on its capability for selective catalytic reduction of NO were studied. The catalyst was characterized by XRD and SEM. The characterization results show that with the addition of Fe,the particles on the catalyst surface are more uniform and the dispersion degree of the catalyst is better. Using Ce(NO3)3,Fe(NO3)3·9H2O,TiOSO4·2H2O as raw material,the ironcerium-titanium composite oxide with n(Ce)∶n(Fe)∶n(Ti)=0.2∶0.8∶1(Ce0.2Fe0.8TiOx) was prepared and used as catalyst. Under the conditions of reaction temperature 250 ℃,reaction time 3 h and volume space velocity 25 000 h-1,the NO removal rate is 99.8% and the N2 selectivity is 100%. The resistant ability of Ce0.2Fe0.8TiOx to H2O and SO2 is signifi cantly improved with the addition of Fe.
Fe-Ce-Ti composite oxide catalyst was prepared by coprecipitation method. The effects of Fe dosage,volume space velocity,H2O and SO2 addition on its capability for selective catalytic reduction of NO were studied. The catalyst was characterized by XRD and SEM. The characterization results show that with the addition of Fe,the particles on the catalyst surface are more uniform and the dispersion degree of the catalyst is better. Using Ce(NO3)3,Fe(NO3)3·9H2O,TiOSO4·2H2O as raw material,the ironcerium-titanium composite oxide with n(Ce)∶n(Fe)∶n(Ti)=0.2∶0.8∶1(Ce0.2Fe0.8TiOx) was prepared and used as catalyst. Under the conditions of reaction temperature 250 ℃,reaction time 3 h and volume space velocity 25 000 h-1,the NO removal rate is 99.8% and the N2 selectivity is 100%. The resistant ability of Ce0.2Fe0.8TiOx to H2O and SO2 is signifi cantly improved with the addition of Fe.
引文
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[12]Liu Fudong,He Hong,Zhang Changbin.Novel iron titanate catalyst for the selective catalytic reduction of NO with NH3 in the medium temperature range[J].Chem Commun,2008,17:2043-2045.
[2]Lietti L,Ramis G,Berti F,et al.Chemical and mechanistic aspects of the selective catalytic reduction of NOxby ammonia over oxide catalysts:A review[J].Appl Catal,B,1998,18(1/2):1-36.
[3]Shan Wenpo,Liu Fudong,He Hong,et al.Novel cerium-tungsten mixed oxide catalyst for the selective catalytic reduction of NOx with NH3[J].Chem Commun,2011,47:8046-8048.
[4]Chen Xiongbo,Gao Shan,Wang Haiqiang,et al.Selective catalytic reduction of NO over carbon nanotubes supported CeO2[J].Catal Commun,2011,14(1):1-5.
[5]Wu Zhongbiao,Jiang Boqiong,Liu Yue.Effect of transition metals addition on the catalyst of manganese/titania for low-temperature selective catalytic reduction of nitric oxide with ammonia[J].Appl Catal,B,2008,79(4):347-355.
[6]Xu Wenqing,Yu Yunbo,Zhang Changbin,et al.Selective catalytic reduction of NO by NH3 over a Ce/TiO2catalyst[J].Catal Commun,2008,9(6):1453-1457.
[7]Liu Fudong,He Hong,Zhang Changbin,et al.Mechanism of the selective catalytic reduction of NO with NH3 over environmental-friendly iron titanate catalyst[J].Catal Today,2011,175(1):18-25.
[8]熊志波,路春美.铁铈复合氧化物催化剂SCR脱销的改性研究[J].燃料化学学报,2013,41(3):361-367.
[9]Liu Fudong,He Hong,Zhang Changbin,et al.Selective catalytic reduction of NO with NH3 over iron titanate catalyst:Catalytic performance and characterization[J].Appl Catal,B,2010,96(3/4):408-420.
[10]Pena D A,Uphade B S,Smirniotis P G.TiO2-supported metal oxide catalysts for low-temperature selective catalytic reduction of NO with NH3:I.Evaluation and characterization of fi rst row transition metals[J].J Catal,2004,221(2):421-431.
[11]Xu Wenqing,He Hong,Yu Yunbo.Deactivation of a Ce/TiO2 catalyst by SO2 in the Selective Catalytic Reduction of NO by NH3[J].J Phys Chem C,2009,113(11):4426-4432.
[12]Liu Fudong,He Hong,Zhang Changbin.Novel iron titanate catalyst for the selective catalytic reduction of NO with NH3 in the medium temperature range[J].Chem Commun,2008,17:2043-2045.