高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (12): 2072.

• 研究论文 • 上一篇    下一篇

SO2对NO催化氧化过程的影响(Ⅱ)载体γ-Al2O3与SO2的相互作用

李平1, 赵越1, 卢冠忠1, 赵秀阁2, 鲁文质2, 肖文德2   

  1. 1. 华东理工大学工业催化研究所;
    2. 华东理工大学联合反应工程研究所, 上海 200237
  • 收稿日期:2000-10-25 出版日期:2001-12-24 发布日期:2001-12-24
  • 通讯作者: 卢冠忠(1956年出生),男,博士,教授,博士生导师,从事催化研究.E-mail:gzhlu@ecust.edu.cn E-mail:gzhlu@ecust.edu.cn
  • 基金资助:

    国家自然科学基金九五重点项目(批准号:29633030)资助

Effect of SO2 on NO Catalytic Oxidation(Ⅱ) Interaction Betweenγ-Al2O3 Support and SO2

LI Ping1, ZHAO Yue1, LU GuanZhong1, ZHAO XiuGe2, LU WenZhi2, XIAO WenDe2   

  1. 1. Research Instituteof Industrial Catalysis;
    2. United Research Instituteof Chemical Reaction Engineering, East China Universityof Scienceand Technology, Shanghai 200237, China
  • Received:2000-10-25 Online:2001-12-24 Published:2001-12-24

摘要: 考察了423K时SO2在γ-Al2O3上反复作用对NO氧化过程的影响.结果显示,SO2的存在在一段时间内促进了γ-Al2O3对NO的催化氧化.用TPD,FTIR,XRD,BET及固体酸度测定等多种表征讨论了γ-Al2O3和SO2之间的相互作用.研究表明,SO2在γ-Al2O3表面与NO等吸附物结合形成活性吸附物种是γ-Al2O3在SO2气氛中显示氧化活性的重要原因,但当其表面被强吸附的SO2逐步覆盖后,则活性下降.

关键词: NO催化氧化, SO2影响, &gamma, -Al2O3, 催化剂失活

Abstract: The effect of SO2 on the catalytic oxidation of NOover γAl2O3 support was studied at temperature of 423 K. It was found that the activity of γAl2O3 for the oxidation of NOto NO2 was enhanced temporarily in the presence of SO2. The adsorption capacity of NOand SO2 was also promoted by each other. The interaction between γAl2O3 and SO2 was discussed by using of various material characterization techniques such as TPD, FTIR, XRD, BET, solid acid detection and so on. After long time reaction in the presence of SO2, no solid nitrate and sulfate were detected in γAl2O3, but the Lacid and Bacid concentrations were increased. TPDspectra show that the desorption peak of NO2 species in the range of higher temperatures mounts up after SO2 coadsorption with NOand O2 on γAl2O3. FTIRresults indicate that different kinds of adsorption species are present on the surface of γAl2O3 and the main NOadsorption species are changed by SO2 coadsorption. An active surface species, which may be responsible for the higher oxidation activity of γAl2O3 in the presence of SO2, is supposed to be formed on the surface of γAl2O3 via SO2, NO, O2 and surfaceadsorbed hydroxide. The activity of γAl2O3 decreases while the surface of γAl2O3 is covered gradually by a strong adsorption of SO2.

Key words: Catalytic oxidation of NO, Effect of SO2, γAl2O3, Deactivation of catalyst

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