Citation: AO Ping, XU Xiang-Sheng, XU Xiao-Xiao, LI Jia-Heng, YAN Xin-Huan. Low-Temperature Total Oxidation of Toluene over Assembled Pt/TiO₂ Catalyst[J]. Acta Physico-Chimica Sinica, ;2014, 30(5): 950-956. doi: 10.3866/PKU.WHXB201403111 shu

Low-Temperature Total Oxidation of Toluene over Assembled Pt/TiO₂ Catalyst

1.
State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, P. R. China

Received Date: 6 December 2013
Available Online: 11 March 2014
Fund Project:

A highly active assembled Pt/TiO₂ catalyst (Pt/TiO₂-AS) was synthesized using a simple directadsorption method, in which uniformly dispersed Pt nanoparticles were directly loaded on a TiO₂ support. Compared with Pt/TiO₂ produced by wet impregnation (Pt/TiO₂-WI), the Pt/TiO₂-AS catalyst exhibited higher activity in the total oxidation of toluene, with a toluene conversion to CO₂ and H₂O of 100% at 150 ℃. The high activity remained even at high toluene concentrations and gas hourly space velocities. The properties of the synthesized catalysts were characterized using X- ray diffraction (XRD), N₂ adsorption- desorption (Brunauer-Emmett-Teller (BET) method), transmission electron microscopy (TEM), X- ray photoelectron spectroscopy (XPS), temperature-programmed reduction of H₂ (H₂-TPR), and Fourier-transform infrared (FTIR) spectroscopy. The results showed that the Pt/TiO₂-AS crystallites were smaller than those of Pt/TiO₂-WI, with fine dispersion, greater Pt⁰ exposure on the support surface, and more active Ti―O bands, giving more oxygen vacancies and reactive oxygen species. The valence states of the active centers changed significantly (Pt⁰→Pt^δ+) during stability tests; this is the main reason for the deactivation of the Pt/TiO₂-AS catalyst.
- Platinum,
- Titanium dioxide,
- Assembled catalyst,
- Toluene,
- Total oxidation
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Low-Temperature Total Oxidation of Toluene over Assembled Pt/TiO2 Catalyst

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Low-Temperature Total Oxidation of Toluene over Assembled Pt/TiO₂ Catalyst