金溶液pH值及浸泡处理对Au/Al_2O_3催化剂上CO氧化反应活性的影响  

Influence of Gold Solution pH Value and Steeping Treatment on CO Oxidation Reactivity over Au/Al_2O_3 Catalyst

作　　者：索掌怀[1] 翁永根[1] 金明善[1] 吕爱花[1] 徐金光[1] 安立敦[1] 

机构地区：[1]烟台大学应用催化研究所,山东烟台264005

出　　处：《催化学报》2005年第11期1022-1026,共5页

基　　金：国家自然科学基金资助项目(20273057;20473070);山东省自然科学基金资助项目(Y2004B07)

摘　　要：采用阴离子浸渍法制备了Au/Al2O3催化剂,考察了溶液pH值及浸泡处理对催化剂上CO氧化反应的影响.结果表明,催化剂的活性随着浸渍液氯金酸溶液pH值的升高而升高.对于经300℃下H2还原处理的Au/Al2O3催化剂,无论用水浸泡还是用氨水浸泡,室温下CO转化率均可达到100%,且催化剂具有良好的稳定性.用氨水浸泡的催化剂经氧化处理后依然保持高活性,但用水浸泡的催化剂活性大幅度下降.XPS结果表明,用氨水浸泡的Au/Al2O3催化剂表面含有Al,O,C,N,Na和Au原子,但没有Cl原子存在.这说明用氨水浸泡催化剂可有效除去Cl-离子而提高其催化活性.The Au/Al2O3 catalyst was prepared by anionic impregnation with HAuC14 solution. The effects of pH value of the solution and washing treatment on CO oxidation were studied. The CO oxidation reactivity at room temperature increased with the pH value of the solution. The catalyst reduced in H2 at 300℃, whether steeping in H20 or NH3·H2O, showed high activity and good stability. For the catalyst calcined in air at 300℃, steeping in NH3·H2O retained high activity but steeping in H2O made the activity decrease rapidly. XPS was employed to determine the surface composition of the catalyst. The catalyst surface contained Al, O, C, N, Na and Au atoms. However, no Cl atoms were present on the surface of the catalyst steeped by NH3·H2O, indicating that the treatment could effectively eliminate Cl^- ions and improve the catalyst activity.

关 键 词：金 氧化铝 负载型催化剂 一氧化碳 氧化 

分 类 号：O643.36[理学—物理化学]