CeO2-WO3/TiO2催化剂中Ce-W相互作用对NH3-SCR反应性能的影响
Synergistic Effect of Ce-W in CeO2-WO3/TiO2 Catalyst on Performance of NH3-SCR Reaction
蒋鹏 1王阳慧 1陈勇 2杨亚萍 1李佳盈 1徐鑫涛 1金璐瑶 1范楷浩 1胡波 3冯淼 2王耀光 2刘雪松1
作者信息
- 1. 绍兴文理学院化学化工学院,浙江绍兴 312000
- 2. 浙江海亮环境材料有限公司,浙江诸暨 311814
- 3. 杭州玺富环保科技有限公司,浙江杭州 310016
- 折叠
摘要
利用浸渍法将15％(质量分数)的CeO2和WO3负载于不同比表面积的Ti02载体上制得3种CeO2-WO3/TiO2催化剂,并考察其在氨选择性催化还原NOx(NH3-SCR)反应中的活性.通过各种表征手段,对催化剂的结构、形貌以及Ce-W物种的状态等物理、化学性能进行了系统的研究.结果表明,低比表面积TiO2载体上富集了更多的Ce和W物种,两者之间显著的相互作用使催化剂中产生了更多的Cen+-O2--Wn+氧桥键.Cen+-O2--Wn+能够促进Ce3+和氧缺位的生成,进而提升催化剂的低温脱硝性能.而Ce和W物种则更易进入高比表面积TiO2载体内部,或高分散于载体表面,这会导致Ce-W间相互作用减弱,因此所得催化剂的低温活性相对较差.
Abstract
Three kinds of CeO2-WO3/TiO2 catalysts were prepared by impregnating 15％CeO2 and WO3 on TiO2 supports with different specific surface areas,and their activities in ammonia selective catalytic reduction of NOx(NH3-SCR)were investigated.The physical and chemical properties of the catalysts,such as the structure,mor-phology and the state of Ce-W species,were systematically studied by means of various characterization meth-ods.The results show that more Ce and W species are enriched on the low specific surface area TiO2 support,and the significant synergistic effect between them results in more Cen+-O2--Wn+oxygen bridge bonds in the cata-lyst.Cen+-O2--Wn+can promote the formation of Ce3+and oxygen deficiency,and then improve the low tempera-ture denitration performance of the catalyst.However,Ce and W species are more likely to enter into the TiO2 support with high specific surface area,or highly disperse on the surface of the carrier,which will lead to weak-ened interaction,so the low temperature activity of the obtained catalyst is relatively poor.
关键词
CeO2-WO3/TiO2/相互作用/比表面积/NH3-SCR/活性氧物种Key words
CeO2-WO3/TiO2/synergistic effect/specific surface area/NH3-SCR/active sites引用本文复制引用
基金项目
浙江省重点研发科技项目(2020C01134)
国家级大学生创新创业训练计划(202010349023)
浙江省公益科技项目(LGG19B070002)
出版年
2024
NETL
NSTL
万方数据