制备方法对V2O5/WO3-TiO2催化剂脱除柴油车尾气中NOx的影响

doi:10.1016/S1872-2067(14)60218-7

催化学报 ›› 2014, Vol. 35 ›› Issue (12): 2020-2028.DOI: 10.1016/S1872-2067(14)60218-7

制备方法对V₂O₅/WO₃-TiO₂催化剂脱除柴油车尾气中NO_x的影响

庞磊^a,b, 范驰^a, 邵丽娜^a, 易俊霞^b, 蔡星^b, 王健^b, 康明^b, 李涛^a,c

a. 华中科技大学化学与化工学院, 湖北武汉430074;
b. 东风汽车有限公司商用车技术中心, 湖北武汉430056;
c. 华中科技大学大型电池关键材料与系统教育部重点实验室, 湖北武汉430074

收稿日期:2014-06-20 修回日期:2014-09-02 出版日期:2014-11-29 发布日期:2014-11-29
通讯作者: 李涛

Effect of V₂O₅/WO₃-TiO₂ catalyst preparation method on NO_x removal from diesel exhaust

Lei Pang^a,b, Chi Fan^a, Lina Shao^a, Junxia Yi^b, Xing Cai^b, Jian Wang^b, Ming Kang^b, Tao Li^a,c

a. School of Chemistry & Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China;
b. Technical Center of Dongfeng Commercial Vehicle Co., Ltd, Wuhan 430056, Hubei, China;
c. Key Laboratory for Large-Format Battery Materials and System, Ministry of Education, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China

Received:2014-06-20 Revised:2014-09-02 Online:2014-11-29 Published:2014-11-29

摘要/Abstract

摘要：

分别采用普通浸渍法(VWTi-con)和超声辅助浸渍法(VWTi-HUST)制备了V₂O₅/WO₃-TiO₂催化剂, 并用X射线衍射、扫描电镜、拉曼光谱和X射线光电子能谱等技术对催化剂进行了表征, 评价了水热老化前后两种催化剂的NH₃-SCR脱除模拟柴油车尾气中NO_x的反应活性, 并与国外成熟商品催化剂进行了比较.结果表明, 制备方法可影响V₂O₅/WO₃-TiO₂催化剂的水热稳定性, VWTi-con催化剂老化后几乎完全失活, 而VWTi-HUST具有优异的水热稳定性, 与国外成熟商品催化剂性能相当.与传统浸渍法相比, 超声辅助浸渍法增强了活性物种和载体的相互作用, 提高了活性组分的分散性等.采用该法制备的VWTi-HUST催化剂将具有较强的商业应用性; 台架试验正在进行中, 以期满足柴油车国IV排放标准的要求.

关键词: 选择性催化还原, 氮氧化合物, 钒基催化剂, 水热稳定性, 柴油机

Abstract:

V₂O₅/WO₃-TiO₂ catalysts were prepared by conventional impregnation (VWTi-con) and ultrasound-assisted impregnation methods (VWTi-HUST). Their catalytic performance was tested for the selective catalytic reduction (SCR) of NO with NH₃. The effects of the preparation methods on the catalyst properties were studied. The catalysts were characterized by X-ray diffraction, scanning electron microscopy, Raman and X-ray photoelectron spectroscopy. Both structural investigation and NH₃-SCR activity showed that the preparation method had a strong effect on the thermal behavior of the V₂O₅/WO₃-TiO₂ catalysts. After a hydrothermal treatment, a significant loss of NO reduction activity was observed for the VWTi-con catalyst, which suffered severe sintering and even formed a rutile V_xTi_1-xO₂ solid solution, while the VWTi-HUST catalyst had the same good hydrothermal stability as a commercial catalyst, indicating that the VWTi-HUST catalyst can be used in a commercial diesel after-treatment system. The ultrasound-assisted impregnation method produced a stronger interaction between the vanadium species and WTi support, which stabilized the vanadium species in the reduced state.

Key words: Selective catalytic reduction, Nitrogen oxide, Vanadium catalyst, Hydrothermal stability, Diesel engine

庞磊, 范驰, 邵丽娜, 易俊霞, 蔡星, 王健, 康明, 李涛. 制备方法对V₂O₅/WO₃-TiO₂催化剂脱除柴油车尾气中NO_x的影响[J]. 催化学报, 2014, 35(12): 2020-2028.

Lei Pang, Chi Fan, Lina Shao, Junxia Yi, Xing Cai, Jian Wang, Ming Kang, Tao Li. Effect of V₂O₅/WO₃-TiO₂ catalyst preparation method on NO_x removal from diesel exhaust[J]. Chinese Journal of Catalysis, 2014, 35(12): 2020-2028.

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制备方法对V₂O₅/WO₃-TiO₂催化剂脱除柴油车尾气中NO_x的影响

Effect of V₂O₅/WO₃-TiO₂ catalyst preparation method on NO_x removal from diesel exhaust

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