摘要
采用浸渍法制备了W质量分数分别为0%、5%、10%的Pt/ZSM-5催化剂,依次命名为Pt-ZSM-5、Pt-5%W/ZSM-5、Pt-10%W/ZSM-5,基于模拟气试验平台研究了不同掺W量对氢气选择性催化还原(hydrogen selective catalytic reduction,H_(2)-SCR)NO_(x)性能的影响,并利用X射线衍射(X-ray diffraction,XRD)、Brunauer Emmett Teller(BET)比表面积、X射线光电子能谱(X-ray photoelectron spectrometer,XPS)对其理化性能进行了表征。结果表明:在H_(2)体积分数0.2%下,Pt-5%W/ZSM-5的最高NO_(x)转化率比Pt/ZSM-5及Pt-10%W/ZSM-5均高出20%;在H_(2)体积分数0.3%下,Pt-5%W/ZSM-5的最高NO_(x)转化率比Pt/ZSM-5及Pt-10%W/ZSM-5分别高出20%和30%。Pt在Pt-5%W/ZSM-5中分散得更明显,WO_(3)的特征衍射峰更高。通过H_(2)程序升温还原(H_(2)-temperature programmed reduction,H_(2)-TPR)和NH_(3)程序升温脱附(NH_(3)-temperature programmed desorption,NH_(3)-TPD)对催化剂的还原性和酸性进行测试,结果表明,掺混了W的Pt/ZSM-5与纯Pt/ZSM-5酸性接近,H_(2)在Pt-5%W/ZSM-5中表现出更好的还原性。
Pt/ZSM-5 catalysts with W mass fractions of 0%,5%and 10%(denoted as Pt/ZSM-5,Pt-5%W/ZSM-5,and Pt-10%W/ZSM-5 in sequence)were prepared by impregnation method.The effects of varying tungsten content on the performance of hydrogen selective catalytic reduction(H_(2)-SCR)of NO_(x)were investigated on a simulated gas experimental platform.The physicochemical properties of the catalysts were characterized using X-ray diffraction(XRD),Brunauer-Emmett-Teller(BET)surface area analysis and X-ray photoelectron spectroscopy(XPS).The results showed that at the condition of 0.2%H_(2)by volume fraction,the NO_(x)conversion rate of Pt-5%W/ZSM-5 was 20%higher than that of Pt/ZSM-5 and Pt-10%W/ZSM-5 at the highest point.At the condition of 0.3%H_(2)concentration by volume fraction,it was 20%and 30%higher than Pt/ZSM-5 and Pt-10%W/ZSM-5.Pt was more clearly dispersed in Pt-5%W/ZSM-5 and the characteristic diffraction peaks of WO_(3) were higher.The reducibility and acidity of the catalysts were tested using H_(2)-temperature programmed reduction(H_(2)-TPR)and NH_(3)-temperature programmed desorption(NH_(3)-TPD).The results indicated that the acidity of tungsten-doped Pt/ZSM-5 was similar to that of pure Pt/ZSM-5,while the reducibility of H_(2)was significantly enhanced in the Pt-5%W/ZSM-5.
作者
叶泉鑫
王攀
成龙伟
赵虹钰
雷利利
赵海林
YE Quanxin;WANG Pan;CHENG Longwei;ZHAO Hongyu;LEI Lili;ZHAO Hailin(School of Automotive and Traffic Engineering,Jiangsu University,Zhenjiang 212013,China;Kailong Lanfeng New Material Technology Co.,Ltd.,Zhenjiang 212000,China)
出处
《内燃机工程》
北大核心
2025年第6期74-81,共8页
Chinese Internal Combustion Engine Engineering
基金
国家自然科学基金项目(52076104)。
关键词
选择性催化还原
氮氧化物
W改性
氢气
分子筛
selective catalytic reduction(SCR)
NO_(x)
W modification
hydrogen
molecular sieve
