叶泉鑫,王攀,成龙伟,等.钨对Pt/ZSM-5氢气选择性催化还原NOx的影响[J].内燃机工程,2025,46(6):74-81.
钨对Pt/ZSM-5氢气选择性催化还原NOx的影响
Effects of W on H2-Selective Catalytic Reduction of NOx by Pt/ZSM-5
DOI：10.13949/j.cnki.nrjgc.2025.06.008
关键词:选择性催化还原  氮氧化物  W改性  氢气  分子筛
Key Words:selective catalytic reduction（SCR）  NOx  W modification  hydrogen  molecular sieve
基金项目:国家自然科学基金项目（52076104）
作者单位E-mail
叶泉鑫* 江苏大学 汽车与交通工程学院，镇江 212013 1942053732@qq.com 
王攀* 江苏大学 汽车与交通工程学院，镇江 212013 wangpan@ujs.edu.cn 
成龙伟 江苏大学 汽车与交通工程学院，镇江 212013 2782406058@qq.com 
赵虹钰 江苏大学 汽车与交通工程学院，镇江 212013 18336624809@163.com 
雷利利 江苏大学 汽车与交通工程学院，镇江 212013 lll0817@ujs.edu.cn 
赵海林 凯龙蓝锋新材料科技有限公司，镇江 212000 zhaohl@kailongtec.com 
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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， H2-SCR）NOx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H2体积分数0.2%下，Pt-5%W/ZSM-5的最高NOx转化率比Pt/ZSM-5及Pt-10%W/ZSM-5均高出20%；在H2体积分数0.3%下，Pt-5%W/ZSM-5的最高NOx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，WO3的特征衍射峰更高。通过H2程序升温还原（H2-temperature programmed reduction， H2-TPR）和NH3程序升温脱附 （NH3-temperature programmed desorption， NH3-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，H2在Pt-5%W/ZSM-5中表现出更好的还原性。
Abstract: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 （H2-SCR） of NOx 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% H2 by volume fraction， the NOx 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% H2 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 WO3 were higher. The reducibility and acidity of the catalysts were tested using H₂-temperature programmed reduction （H₂-TPR） and NH₃-temperature programmed desorption （NH₃-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 H2 was significantly enhanced in the Pt-5%W/ZSM-5.
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