SO_2对NO催化氧化过程的影响(Ⅱ)载体γ-Al_2O_3与SO_2的相互作用  

Effect of SO_2 on NO Catalytic Oxidation(Ⅱ) Interaction Betweenγ-Al_2O_3 Support and SO_2

作　　者：李平[1] 赵越[1] 卢冠忠[1] 赵秀阁[2] 鲁文质[2] 肖文德[2] 

机构地区：[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

出　　处：《高等学校化学学报》2001年第12期2072-2076,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金九五重点项目 (批准号 :2 96 330 30 )资助

摘　　要：考察了 4 2 3K时 SO2 在γ-Al2 O3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-Al2 O3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-Al2 O3和 SO2 之间的相互作用 .研究表明 ,SO2 在 γ-Al2 O3表面与 NO等吸附物结合形成活性吸附物种是γ-Al2 O3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 。The effect of SO\-2 on the catalytic oxidation of NO over \%γ\%\|Al\-2O\-3 support was studied at temperature of 423 K. It was found that the activity of \%γ\%\|Al\-2O\-3 for the oxidation of NO to NO\-2 was enhanced temporarily in the presence of SO\-2. The adsorption capacity of NO and SO\-2 was also promoted by each other. The interaction between \%γ\%\|Al\-2O\-3 and SO\-2 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 SO\-2, no solid nitrate and sulfate were detected in \%γ\%\|Al\-2O\-3, but the L\|acid and B\|acid concentrations were increased. TPD spectra show that the desorption peak of NO\-2 species in the range of higher temperatures mounts up after SO\-2 co\|adsorption with NO and O\-2 on \%γ\%\|Al\-2O\-3. FTIR results indicate that different kinds of adsorption species are present on the surface of \%γ\%\|Al\-2O\-3 and the main NO adsorption species are changed by SO\-2 co\|adsorption. An active surface species, which may be responsible for the higher oxidation activity of \%γ\%\|Al\-2O\-3 in the presence of SO\-2, is supposed to be formed on the surface of \%γ\%\|Al\-2O\-3 \%via\% SO\-2, NO, O\-2 and surface\|adsorbed hydroxide. The activity of \%γ\%\|Al\-2O\-3 decreases while the surface of \%γ\%\|Al\-2O\-3 is covered gradually by a strong adsorption of SO\-2.

关 键 词：NO 催化氧化 SO2 Γ-AL2O3 催化剂 失活 废气处理 二氧化硫 载体 负载型催化剂 氧化硅 一氧化氮 

分 类 号：X701[环境科学与工程—环境工程] O643.36[理学—物理化学]