贾莉伟,万涛明,王军,沈美庆,王建强,王家明.Pt/Al2O3催化剂用于NO氧化的活化效应研究[J].稀有金属材料与工程,2018,47(5):1562~1566.[JIA LIWEI,WAN TAOMING,WANG JUN,SHEN MEIQING,WANG JIANQIANG,WANG JIAMING.Degreening Effect during NO Oxidation over Pt/Al2O3 Catalyst[J].Rare Metal Materials and Engineering,2018,47(5):1562~1566.]
Pt/Al2O3催化剂用于NO氧化的活化效应研究
投稿时间:2017-09-27  修订日期:2017-11-15
中文关键词:  柴油机氧化催化剂  活化效应  Pt/Al2O3  NO氧化
基金项目:
中文摘要:
      柴油机氧化催化剂(DOC)能将尾气中部分NO氧化成NO2,一定浓度的NO2有利于柴油机颗粒捕集器(DPF)的连续再生和提高选择性催化还原催化剂(SCR)对NOx的转化效率。针对DOC的新鲜态Pt/Al2O3催化剂经过一次程序升温NO催化氧化活性明显提升的现象(活化效应),采用原位红外漫反射实验(in situ DRIFTS)、氢气程序升温还原(H2-TPR)和高分辨透射电子显微镜(HR-TEM)分析Pt/Al2O3催化剂相关过程的物理化学状态。分析结果表明,新鲜态Pt/Al2O3催化剂在300 ℃以下时载体上积累了大量的硝酸盐和亚硝酸盐物种,导致新鲜态催化剂活性不高;进一步的分析表明经一次程序升温后催化剂中与载体结合强的PtOx物种的分解是引起活化效应的主要原因;经过三次程序升温反应,催化剂中Pt粒子的大小没有发生明显改变。
Degreening Effect during NO Oxidation over Pt/Al2O3 Catalyst
英文关键词:Diesel oxidation catalysts  degreening effect  Pt/Al2O3 catalysts  NO oxidation
英文摘要:
      Partial NO is oxidized to NO2 during the emission gas through diesel oxidation catalysts (DOC). Proper NO2 /NOx ratio increases the low-temperature soot oxidation rate of diesel particulate filter (DPF) and the NOx conversion efficiency of selective catalytic reduction (SCR). In order to study the degreening effect of DOC, in-situ diffuse reflectance infrared Fourier transform spectroscopy (In-situ DRFTS), H2 temperature-programmed reduction (H2-TPR) and High-revolution transmission electron microscope (HR-TEM) were performed to characterize the Pt/Al2O3 catalyst. A larger amount of nitrate and nitrite species was observed in the fresh Pt/Al2O3 catalysts blow 300 oC. It is shown that PtOx species that interacted strongly with support are the main cause of degreening effect. The particle size of Pt has no significant change after 3-cycles temperature-programmed reaction.
作者单位E-mail
贾莉伟 无锡威孚环保催化剂有限公司 lwjia@tju.edu.cn 
万涛明 天津大学  
王军 天津大学  
沈美庆 天津大学  
王建强 天津大学  
王家明 无锡威孚环保催化剂有限公司  
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