W掺入对Ti_(0.8)Zr_(0.2)Ce_(0.2)O_(2.4)/Al_2O_3-TiO_2-SiO_2催化脱硝性能的优化  

Promotional Effect of Tungsten Incorporation on Catalytic Performance of Ti_(0.8)Zr_(0.2)Ce_(0.2)O_(2.4)/Al_2O_3-TiO_2-SiO_2 for Selective Catalytic Reduction of NO_x by NH_3

作　　者：付伟良 沈岳松[1] 祝社民[1] 沈树宝[1] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009

出　　处：《无机材料学报》2014年第12期1294-1300,共7页Journal of Inorganic Materials

基　　金：江苏省环保科研课题(2012016);国家自然科学基金(21106071;51272105);国家科技支撑计划(2012BAE01B03);教育部博士点基金(20113221120004);江苏省社会发展科技支撑计划(BE2013718)~~

摘　　要：以Al2O3-TiO2-SiO2(ATS)为载体、Ti0.8Zr0.2Ce0.2O2.4(TZC)为催化活性组分,采用挤出成型法制备系列整体式TZC/ATS及W掺入催化剂样品。研究了W掺入对催化剂TZC/ATS的氨气选择性催化还原(NH3-SCR)脱除NO活性及抗K2O、CaO等毒性的影响,比较了Ti0.8Zr0.2Ce0.2W0.08O2.64/ATS(TZCW0.4/ATS)催化剂与V2O5(WO3)/TiO2催化剂的抗K2O、CaO等中毒性能,并采用N2-BET、XRD、SEM和NH3-TPD等技术手段分别表征了催化剂的比表面积、固相结构、微观形貌及表面酸性。结果表明,当活性组分中Ti/Zr/Ce/W元素摩尔比为4:1:1:0.4时,TZCW0.4/ATS催化剂NH3-SCR脱除NO的效率最高、稳定性最好。W掺入显著增强了催化剂的抗K2O及CaO毒性能力,且TZCW0.4/ATS催化剂抗K2O及CaO的中毒能力明显强于V2O5(WO3)/TiO2催化剂。分析表明,W掺入提高了TZCW0.4/ATS催化剂的比表面积,增加了催化剂的表面酸量,从而优化了催化剂的脱硝性能。Series TZC/ATS catalysts and the tungsten-added samples, with Ti0.8Zr0.2Ce0.2O2.4 （TZC for short） as active component and Al2O3-TiO2-SiO2 （ATS for short） as catalyst carrier, were prepared by extrusion method. Effects of tungsten incorporation on catalytic performance and tolerance towards K2O and CaO poisoning of TZC/ATS for deNOx by NH3 selective catalytic reduction （NH3-SCR） were mainly studied, and anti K2O and CaO poisoning abilities between the TZCW0.4/ATS and the V2O5（WO3）/TiO2 were comparatively analyzed. Moreover, the specific surface, solid-phase structure, morphology and surface acidity of the catalysts were characterized by techniques of N2-BET, XRD, SEM and NH3-TPD, respectively. Results showed that the TZCW0.4/ATS catalyst exhibited the highest catalytic activity and the best stability for deNOx by NH3-SCR when the Ti/Zr/Ce/W molar ratio of the active component was 4：1：1：0.4. Furthermore, tungsten incorporation greatly enhanced the anti K2O and CaO poisoning abilities of the TZCW0.4/ATS catalyst, and these anti-poisoning abilities of the TZCWo.a/ATS were muchstronger than those of the VEO5（WO3）/TiO2. The promotional effect on catalytic deNOx performance was caused by increased specific surface area and enhanced surface acidity of the TZCW0.4/ATS catalyst after tungsten incorporation.

关 键 词：Ti0.8Zr0.2Ce0.2O2.4/Al2O3-TiO2-SiO2催化剂 W掺入 水泥烟气脱硝 抗K2O中毒 抗CaO中毒 

分 类 号：TB34[一般工业技术—材料科学与工程]