马璇璇
,
朱银华
,
李力成
,
王昌松
,
陆小华
,
杨祝红
催化学报
doi:10.1016/S1872-2067(11)60415-4
以二钛酸钾晶须为前驱体,通过固相烧结工艺制备了介孔 TiO2晶须,然后使用沉积沉淀法将 Au 纳米颗粒担载于其上,并采用低温 N2吸附-脱附、X 射线衍射及透射电镜等技术对催化剂的形貌和结构进行了表征,以 NaBH4还原对硝基苯酚(PNP)为探针反应,评价了催化剂的活性及稳定性.结果表明,500°C 热处理前后,介孔 TiO2负载的 Au 纳米颗粒的平均粒径变化不大,且催化 PNP 还原活性得到了很好的保持.这主要与介孔 TiO2晶须独特的双晶构型及介孔结构有关.
关键词:
纳米金
,
热稳定性
,
介孔氧化钛
,
双晶
,
对硝基苯酚
,
还原
李力成
,
王昌松
,
马璇璇
,
杨祝红
,
陆小华
催化学报
doi:10.1016/S1872-2067(11)60471-3
An Au-Cu bimetal catalyst was prepared by deposition-precipitation (urea) of gold and copper species on mesoporous TiO2 and activation with H2. The sample was characterized by N2 adsorption/desorption, X-ray diffraction, ultraviolet-visible spectroscopy, and high-resolution transmission electron microscopy. The results showed that the Au and Cu species formed an Au-Cu alloy and were well dis-persed on the mesoporous TiO2. According to CO oxidation test results, it was found that the catalytic activity of gold was enhanced by cop-per. The Au-Cu bimetal catalyst supported on mesoporous TiO2 showed better catalytic stability in CO oxidation than the Au catalyst sup-ported on mesoporous TiO2 and the nonporous TiO2-supported catalysts. This may be related to the effects of both Au-Cu alloying and the mesostructure of TiO2.
关键词:
gold
,
copper
,
mesoporous titania
,
stability
,
carbon monoxide
,
oxidation
