Preparation and Properties of Pt/ZrxTi1-xO2 Catalysts with Low-Level SO2 Oxidation Activity for Diesel Oxidation

doi:10.3724/SP.J.1088.2012.11108

Abstract

Abstract: A series of Zr_xTi_1-xO₂ (x = 0, 0.1, 0.5, 0.9, 1.0) mixed oxides were prepared by the co-precipitation method and were used as supports to prepare Pt/Zr_xTi_1-xO₂ catalysts by impregnation with H₂PtCl₆ solution. The catalysts were characterized by N₂ adsorption, X-ray diffraction-desorption, X-ray photoelectron spectroscopy, H₂ temperature-programmed reduction, and NH₃ temperature-programmed desorption. The results indicated that the dominative crystalline phase of Zr_0.1Ti_0.9O₂ is anatase and it has higher specific surface area (94 m²/g) and larger pore volume (0.33 cm³/g). Compared with the Pt/Zr_xTi_1-xO₂(x = 0, 0.5, 0.9, 1.0) catalysts, Pt/Zr_0.1Ti_0.9O₂ shows excellent catalytic activity (T₅₀ of HC and CO are 185 and 174 ^oC, respectively, and T₉₀ of HC and CO are 197 and 201 ^oC, respectively) and low-level oxidation activity of SO₂ (the SO₂ conversion at 350 ^oC is only 25.5%).

Key words: zirconium, titanium, mixed oxide, co-precipitation, supported catalyst, impregnation

YANG Zheng-Zheng, CHEN Yong-Dong, ZHAO Ming, ZHOU Ju-Fa, GONG Mao-Chu, CHEN Yao-Qiang. Preparation and Properties of Pt/Zr_xTi_1-xO₂ Catalysts with Low-Level SO₂Oxidation Activity for Diesel Oxidation[J]. Chinese Journal of Catalysis, 2012, 33(5): 819-826.

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Preparation and Properties of Pt/Zr_xTi_1-xO₂ Catalysts with Low-Level SO₂Oxidation Activity for Diesel Oxidation

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