TiOx/SiO2复合载体上高分散Au催化剂的CO氧化性能

doi:10.3866/PKU.WHXB201507091

Abstract

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: Gold, Nanoparticle, TiO_x/SiO₂ composite support, CO oxidation, Titania

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

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

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