TiOx/SiO2复合载体上高分散Au催化剂的CO氧化性能

引用本文: 李晓坤, 马冬冬, 郑燕萍, 张宏, 丁丁, 陈明树, 万惠霖. TiO_x/SiO₂复合载体上高分散Au催化剂的CO氧化性能[J]. 物理化学学报, 2015, 31(9): 1753-1760. doi: 10.3866/PKU.WHXB201507091 shu

Citation: LI Xiao-Kun, MA Dong-Dong, ZHENG Yan-Ping, ZHANG Hong, DING Ding, CHEN Ming-Shu, WAN Hui-Lin. Performance of CO Oxidation over Highly Dispersed ld Catalyst on TiO_x/SiO₂ Composite Supports[J]. Acta Physico-Chimica Sinica, 2015, 31(9): 1753-1760. doi: 10.3866/PKU.WHXB201507091 shu

TiO_x/SiO₂复合载体上高分散Au催化剂的CO氧化性能

基金项目:
国家重点基础研究发展规划项目(973) (2010CB732303, 2013CB933102) (973) (2010CB732303, 2013CB933102)

教育部重大研究计划(309019) (309019)

国家自然科学基金(20923004,21033006, 21073149, 21273178) (20923004,21033006, 21073149, 21273178)

教育部创新研究团队项目(IRT1036)资助 (IRT1036)

摘要:

负载型Au催化剂中金与载体间存在相互作用, 载体性质能够影响Au纳米颗粒分散度及稳定性. 本文通过表面溶胶-凝胶(SSG)法制备了TiO_x/SiO₂复合载体, 以期增加氧化物载体表面配位不饱和度从而使其具有较高的金属分散性, 并利用低能离子散射(LEIS)谱、X射线光电子能谱(XPS)、X射线衍射(XRD)、透射电子显微镜(TEM)及N₂物理吸附(BET)等手段对载体及催化剂进行表征分析. 实验表明TiO_x/SiO₂复合载体表面TiO_x分散性良好, 没有形成明显的TiO₂晶相, 且与SiO₂间形成Ti―O―Si键. 与Au/TiO₂相比, Au/TiO_x/SiO₂催化剂中Au纳米颗粒的分散性更好, 因而CO氧化活性显著提高. TiO_x/SiO₂复合载体上的TiO₂膜是Au的主要表面键合位, 导致Au与载体间相互作用增强, 从而使得Au纳米颗粒抗烧结能力提高, 同时催化剂反应稳定性得到改善.

关键词:

English

Performance of CO Oxidation over Highly Dispersed ld Catalyst on TiO_x/SiO₂ Composite Supports

1.
College of Chemistry and Chemical Engineering, Xiamen University, State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, Xiamen 361005, Fujian Province, P. R. China
Received Date: 16 April 2015
Available Online: 06 September 2015
Fund Project:
国家重点基础研究发展规划项目(973) (2010CB732303, 2013CB933102)

教育部重大研究计划(309019)

国家自然科学基金(20923004,21033006, 21073149, 21273178)

教育部创新研究团队项目(IRT1036)资助

Abstract:

Supports have a significant effect on the dispersion and stability of Au nanoparticles because of the support-metal interaction. In the present work, TiO_x/SiO₂ composite supports were prepared by the surface sol-gel (SSG) method to enhance the binding strength between the metal and the support. The samples were characterized by low-energy ion scattering (LEIS) spectroscopy, X-ray photoelectron spectroscopy (XPS), Xray diffraction (XRD), transmission electron microscopy (TEM), and N₂ physisorption (BET). The results showed that the TiO_x species in TiO_x/SiO₂ were highly dispersed on SiO2 with the formation of Ti―O―Si linkages. The catalytic activity and stability for CO oxidation on Au/TiO_x/SiO₂ were significantly enhanced, because of the better dispersion of Au nanoparticles compared with Au/TiO₂.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

TiO_x/SiO₂复合载体上高分散Au催化剂的CO氧化性能

English

Performance of CO Oxidation over Highly Dispersed ld Catalyst on TiO_x/SiO₂ Composite Supports

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