钒钨钛/堇青石基烟气脱硝催化陶瓷滤芯的研制  

Preparation of V_2O_5-WO_3-TiO_2/Cordierite Based Catalytic Filter for Removal of NO_x from Flue Gas

作　　者：张喻升 李长明[2] 曾红 于超[1] 余剑[2] 杨运泉[1] 许光文[2] 高士秋[2] 

机构地区：[1]湘潭大学化工学院,湖南湘潭411105 [2]中国科学院过程工程研究所,北京100190

出　　处：《过程工程学报》2017年第6期1249-1256,共8页The Chinese Journal of Process Engineering

基　　金：中国科学院STS计划资助项目(编号:KFJ-SW-STS-149);政府间国际创新合作项目(编号:2016YFE0128300);日本JSPS博士后项目(编号:P15758);国家自然科学基金资助项目(编号:21601192)

摘　　要：在钒钨钛/堇青石基烟气脱硝催化陶瓷滤芯复合工艺和催化剂浆液配方优化的基础上,考察了浆液固含量、催化剂担载量与应用性能的关联性.结果表明,以堇青石陶瓷膜滤芯为载体,在固含量为10%(w)的偏钒酸铵、偏钨酸铵和偏钛酸的均匀浆液(质量比V2O5/TiO2=0.1,WO3/TiO2=0.08)中进行真空涂覆,经烘干、焙烧后可制成催化剂担载量为4.2%(w)的V2O5-WO3/TiO2基催化陶瓷滤芯.在标准工况过滤速度1cm/s、温度250~350℃及NH3/NO体积比为1的条件下,该催化陶瓷滤芯具有稳定的抗硫抗水中毒能力,其脱硝转化率大于95%,N2O排放值低于25′10-6(j),压降不超过650Pa,达到了脱硝除尘工业应用要求.After optimization of preparation methods and catalyst slurry recipes, the correlation among the solid content of slurries, catalyst loading and catalytic performance were researched. The results showed that the catalytic filter with 4.2%（w） catalyst loading was obtained by being immersed a practical cordierite ceramic filter into the 10%（w, TiO2） aqueous catalyst slurry under vacuum condition, followed by drying and calcination process. The slurry was composed of metatitanic acid, ammonium metavanadate and ammonium metatungstate with mass ratios of V2O5/TiO2=0.1 and WO3/TiO2=0.08. The resulting catalytic filter was evaluated for NH3-SCR reaction at filtration velocity of 1 cm/s and NH3/NO=1（j） at standard conditons. It exhibited that the NO conversion rate was beyond 90%, N2 O escape is less than 25×10^-6（φ） and pressure drop was lower than 650 Pa at the temperature of 250-350 ℃. The catalytic filter also showed a excellent performance for resistance to steam and SO2 poisoning, which meets well the request of industrial application.

关 键 词：烟气脱硝 选择催化还原 催化陶瓷滤芯 V2O5-WO3/TIO2 

分 类 号：X511[环境科学与工程—环境工程]