文章摘要
预处理条件对Pt/Al2O3催化氧化NO性能的影响
Influence of Temperature and Feed Gas on Degreening Effect during the NO Oxidation over Pt/Al2O3 Catalyst
投稿时间:2017-09-16  
DOI:
中文关键词: 催化化学  NO氧化  degreening效应  温度  反应气氛  Pt/Al2O3
英文关键词: analytical chemistry  NO oxidation  degreening effect  temperature  feed gas  Pt/Al2O3
基金项目:
作者单位E-mail
贾莉伟 无锡威孚环保催化剂有限公司江苏 无锡 214028 lwjia@tju.edu.cn 
万涛明 天津大学 化工学院天津 300350  
沈美庆 天津大学 化工学院天津 300350  
王军 天津大学 化工学院天津 300350  
王家明 无锡威孚环保催化剂有限公司江苏 无锡 214028;天津大学 化工学院天津 300350 liwei.jia@weifu.com.cn 
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中文摘要:
      考察了温度和反应气氛对新鲜态Pt/Al2O3催化剂上NO氧化过程中的degreening效应的影响。利用活性评价实验测试不同条件下NO氧化活性,用H2程序升温还原(H2-TPR)表征了degreening效应过程中催化剂中Pt的价态变化。在degreening效应过程中,新鲜态Pt/Al2O3催化剂中与载体结合较弱的PtOx物种在温度低于300℃时被NO还原为Pt0;与载体结合较强的PtOx物种在温度高于400℃时分解成Pt0。新鲜态Pt/Al2O3催化剂经过第一次程序升温反应后,NO氧化活性位Pt0的增加导致了其NO氧化能力提高。
英文摘要:
      The influence of temperature and feed gas on degreening effect during NO oxidation over Pt/Al2O3 catalyst was investigated by a single variable method. Activity measurements were carried out to evaluate NO conversion. Meanwhile, H2 -TPR experiments were performed to characterize the catalyst. It was found that PtOx, species which has weak interaction with support could be reduced by NO at temperatures blow 300oC whereas PtOx species having strong interaction with support were decomposed to Pt0 above 400oC. Indicating that the number of Pt0, as the NO oxidation active site, will increase after the first temperature programmed reaction.
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