催化学报 ›› 2012, Vol. 33 ›› Issue (9): 1480-1485.DOI: 10.1016/S1872-2067(11)60415-4

• 研究论文 • 上一篇    下一篇

介孔 TiO2 晶须担载 Au 的热稳定性

马璇璇1, 朱银华2, 李力成1, 王昌松1, 陆小华1, 杨祝红1,*   

  1. 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
  • 收稿日期:2012-03-30 修回日期:2012-05-26 出版日期:2012-09-11 发布日期:2012-09-11

Thermal Stability of Gold Catalyst Supported on Mesoporous Titania Nanofibers

MA Xuanxuan1, ZHU Yinhua2, LI Licheng1, WANG Changsong1, LU Xiaohua1, YANG Zhuhong1,*   

  1. 1State Key Laboratory of Materials-oriented Chemical Engineering, Nanjing University of Technology, Nanjing 210009, Jiangsu, China; 2Technology Research Institute, Jiangsu Hualan New Pharmaceutical Material Co. Ltd., Wuxi 214443, Jiangsu, China
  • Received:2012-03-30 Revised:2012-05-26 Online:2012-09-11 Published:2012-09-11

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.

关键词: 纳米金, 热稳定性, 介孔氧化钛, 双晶, 对硝基苯酚, 还原

Abstract: By deposition-precipitation with urea method, gold was loaded on mesoporous TiO2 whisker, which was prepared from a potassium 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.

Key words: nanogold, thermal stability, mesoporous titania, bicrystal, p-nitrophenol, reduction