文献类型：期刊文献

中文题名：CeO_(2)对钒基催化剂NH_(3)-SCR反应性能的影响

英文题名：Effect of CeO_(2) on Performance of Vanadia-based Catalyst for Selective Catalytic Reduction of NO with NH_(3)

作者：蒋旻[1];邵迅哲[2];王丽[2];韩玉峰[2];郭耘[2]

机构：[1]中国船舶重工集团公司第七二三研究所,江苏扬州225101;[2]华东理工大学工业催化研究所,上海200237

年份：2021

卷号：39

期号：5

起止页码：750

中文期刊名：中国稀土学报

外文期刊名：Journal of the Chinese Society of Rare Earths

收录：CSTPCD;;Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：江苏省科技厅产业前瞻与共性关键技术开发应用项目(SBE2016000218)资助。

语种：中文

中文关键词：V_(2)O_(5)/TiO_(2)催化剂;CeO_(2);氮氧化物;NH_(3)-SCR

外文关键词：V2O5/TiO2 catalyst;CeO2;NOx;NH3-SCR

摘要：氮氧化物(NO_(x))是一种主要的大气污染物,采用氨选择性催化还原(NH_(3)-SCR)是实现NOx排放控制的最有效手段。以V_(2)O_(5)/TiO_(2)为研究对象,通过引入CeO_(2)对其结构及表面性质进行改性,显著提高了V_(2)O_(5)/TiO_(2)催化剂的NH_(3)-SCR反应性能,其中1%(质量分数)V_(2)O_(5)/Ce_(0.1)Ti_(0.9)O_(2)催化剂在180~470℃内NO_(x)的转化率在80%以上,具有较宽的温度操作窗口和良好的抗硫稳定性。表征结果表明:CeO_(2)的引入可抑制TiO_(2)晶体的长大,产生更多的结构畸变,并显著增大催化剂的比表面积。V和Ce物种之间的相互作用促进了催化剂表面V5+物种的形成,增强了催化剂对NO的吸附和氧化能力,并提供较多的弱和中等强度的酸性位,导致其低温SCR反应性能的显著升高;但同时表面强酸中心数量的减少以及NH_(3)非选择性氧化能力的升高,使其高温区SCR的活性明显降低。
Nitrogen oxides(NO_(x)),as a main atmospheric pollutant,has caused fearful harm for human health and environment.The selective catalytic reduction of NO_(x) by ammonia(NH3-SCR)is the most effective technology for the removal of NO_(x).In this paper,the CeO_(2) was used to modify the structure and surface properties of V_(2)O_(5)/TiO_(2) catalyst,which promoted the SCR activity significantly.Among them,1% V_(2)O_(5)/Ce_(0.1)Ti_(0.9)O_(2) catalyst exhibited the best catalytic performance of NH3-SCR reaction and obtained more than 80% NO_(x) conversion in the temperature range of 180~470℃,it also showed the high sulfur resistance.The characterization results showed that the doped CeO_(2) blocked the growth of TiO_(2) crystallite and obviously increased the surface area.The synergy between V and Ce species promoted the formation of surface V5+species,enhanced the adsorption and oxidation of NO and provided more weak/medium acid sites,which improved the SCR activity in the low temperature range.However,the enhanced oxidation ability and reduced the strong surface acid sites decreased the SCR activities of V_(2)O_(5)/CexTi1-xO_(2) in the high temperature range.