介孔TiO_2晶须担载Au的热稳定性(英文)  

Thermal Stability of Gold Catalyst Supported on Mesoporous Titania Nanofibers

作　　者：马璇璇[1] 朱银华 李力成[1] 王昌松[1] 陆小华[1] 杨祝红[1] 

机构地区：[1]南京工业大学材料化学工程国家重点实验室,江苏南京210009 [2]江苏华兰药用新材料股份有限公司技术研究中心,江苏无锡214443

出　　处：《催化学报》2012年第9期1480-1485,共6页

基　　金：国家自然科学基金(20736002,20976080,21136001);国家高技术研究发展计划(863计划,2006AA03Z455)~~

摘　　要：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.By deposition-precipitation with urea method, gold was loaded on mesoporous TiO2 whisker, which was prepared from a potas- sium titanate whisker precursor through solid phase sintering process. The morphology and structure of these as-prepared catalysts were characterized by N2 adsorption-desorption, X-ray diffraction, and transmission electron microscopy. The reduction of 4-nitrophenol to 4-aminophenol by NaBH4 was evaluated as a probe reaction. After calcination at high temperature, the activity of the catalysts supported on mesoporous TiO2 nanofiber was well maintained, and the particle size of gold nanoparticles was hardly changed. This might be attributed to the peculiar crystallographic structure and mesoporous nanoarchitecture of the mesoporous TiO2 whisker.

关 键 词：纳米金 热稳定性 介孔氧化钛 双晶 对硝基苯酚 还原 

分 类 号：O643.36[理学—物理化学]