La_(2)O_(3)修饰V_(2)O_(5)-WO_(3)/TiO_(2)催化剂的低温脱硝性能  

Low-temperature NH_(3)-SCR performance of La_(2)O_(3)-modified V_(2)O_(5)5-WO_(3)/TiO_(2) catalyst

作　　者：孔杨 张泽凯[1] 李浙飞 赵博 卢晗锋[1] Kong Yang;Zhang Zekai;Li Zhefei;Zhao Bo;Lu Hanfeng(Institute of Catalytic Reaction Engineering,Industrial Catalysis,School of Chemistry and Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,Zhejiang,China;Zhejiang Tuna Environmental Science&Technology Co.,Ltd.,Shaoxing 312000,Zhejiang,China)

机构地区：[1]浙江工业大学化学工程学院工业催化学科催化反应工程研究所,浙江杭州310014 [2]浙江德创环保科技股份有限公司,浙江绍兴312000

出　　处：《工业催化》2024年第6期50-56,共7页Industrial Catalysis

基　　金：绍兴市科技计划—产业关键技术攻关计划项目(2022B41007)。

摘　　要：采用稀土金属氧化物La_(2)O_(3)来修饰V_(2)O_(5)-WO_(3)/TiO_(2)催化剂,改善其低温催化性能。通过改变La_(2)O_(3)含量及焙烧温度,并借助XRD、BET、SEM、TEM、NH_(3)-TPD、H_(2)-TPR及XPS等表征手段,讨论了La_(2)O_(3)-V_(2)O_(5)-WO_(3)/TiO_(2)催化剂结构与NH_(3)-SCR低温性能之间的内在关联。结果发现,La_(2)V_(6)W_(5)/TiO_(2)催化剂活性最佳,以NO转化率90%为标准,其工作窗口温度范围下限低至160℃。La_(2)O_(3)的加入提升了催化剂中V^(4+)浓度,改善了氧化还原能力,同时使表面的氧空位吸附氧物种得到增加,进而提升了La_(2)O_(3)-V_(2)O_(5)-WO_(3)/TiO_(2)催化剂的低温脱硝性能。The rare earth metal oxide La_(2)O_(3)was introduced to modify the V_(2)O_(5)-WO_(3)/TiO_(2)catalyst to improve its low-temperature catalytic performance.By adjusting the La_(2)O_(3)content and calcined temperature,and using a series of characterization methods such as XRD,BET,SEM,TEM,NH_(3)-TPD,H_(2)-TPR and XPS,the intrinsic correlation between the structure of La_(2)O_(3)-V_(2)O_(5)-WO_(3)/TiO_(2)catalyst and its NH_(3)-SCR performance in the low temperature range was discussed.The results showed that the La_(2)V_(6)W_(5)/TiO_(2)catalyst had the best activity.Using 90%NO conversion as the criteria,the lower limit of the temperature window extended to 160℃.Its activity improvement was attributed to the addition of La_(2)O_(3),which increased the concentration of V^(4+)in the catalyst to improve the redox capacity and increase the oxygen vacancies on the surface,thereby improving the low-temperature performance of the catalyst.

关 键 词：催化剂工程 脱硝 低温 钒基催化剂 La_(2)O_(3) 氧空位 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]