摘要
采用浸渍法制备了 Ru O2 /γ- Al2 O3和 Ru O2 / Ce O2 /γ- Al2 O3催化剂 ,并利用 XRD、 SEM和 XPS对催化剂进行了表征 ,研究了 Ce的加入对 Ru O2 /γ- Al2 O3催化剂表面分散性和催化剂表面元素 Ru,O和 Ce化学态的影响 ,同时考察了 Ru O2 /γ- Al2 O3和 Ru O2 / Ce O2 /γ- Al2 O3催化剂湿式氧化降解苯酚的活性 ,并深入探讨了 Ce对 Ru O2 /γ- Al2 O3催化剂的助催化作用。结果表明 :Ce掺杂改性后 ,使催化剂表面 Ru的化学态降低、表面氧空位增加 ,并且活性组分Ru的分散性增加 ,从而使 Ru O2 / Ce O2 /γ- Al2 O3催化剂的活性提高 ,因此
RuO_2/γ-Al_2O_3 and RuO_2/CeO_2/γ-Al_2O_3 catalysts were prepared by impregnation of γ-Al_2O_3 with RuCl_3 and Ce(NO_3)_3.The catalysts were characterized by XRD, SEM and XPS.It was studied that adding Ce influenced of the chemical state of Ru, O and Ce on the surface of the catalysts.Catalytic wet air oxidation of phenol was investigated over RuO_2/γ-Al_2O_3 and RuO_2/CeO_2/γ-Al_2O_3 catalysts and the Ce-promoted catalyst was very active.Moreover the reason that Ce promoted the activity of RuO_2/γ-Al_2O_3 catalyst was stndied.The results show that the decrease of the chemical state of Ru,the increase in the surface contents of oxygen vacancies and the better dispersion of RuO_2 are responsible methods for the better activity of RuO_2/CeO_2/γ-Al_2O_3 catalyst.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2003年第11期32-35,39,共5页
Journal of Materials Engineering
