Pt/MOx-SiO2 (M=Ce, Zr, Al)催化剂对CO和C3H8氧化性能的影响

doi:10.3866/PKU.WHXB201204011

Abstract

Abstract: MO_x-SiO₂ (M=Ce, Zr, Al) mixed oxides with a MO_x:SiO₂ mass ratio of 1:1 were prepared by co-precipitation. Pt-only diesel oxidation catalysts supported on these mixed oxides were obtained by the incipient wetness method. The catalytic activities in simplified diesel exhaust gas before and after SO₂ treatment were analyzed. The catalysts were characterized by X-ray diffraction, N₂ adsorption-desorption, NH₃/O₂/CO₂ temperature programmed desorption (NH₃/O₂/CO₂-TPD) and X-ray photoelectron spectroscopy (XPS). The results of NH₃-TPD suggested that the surface of the catalysts had multiple acidic sites, and the number of medium-strength acidic sites increased following treatment with SO₂. The results of O₂-TPD revealed that there were α and β oxygen species in the catalysts, and the amount of O₂ desorption decreased for the SO₂-treated catalysts. The Pt/Al₂O₃-SiO₂ catalyst exhibited the lowest surface acidity and the largest amount of oxygen desorption. XPS indicated that the binding energy of Pt 4f_5/2 decreased when the catalysts were treated with SO₂. All the catalysts showed excellent activity for CO and C₃H₈, and the Pt/ ZrO₂-SiO₂ catalyst exhibited the best SO₂ poisoning resistance, showing the potential for these catalysts to be applied in diesel oxidation.

Key words: Co-precipitation, Mixed oxide, Platinum, Oxidation catalyst, Diesel vehicle, Surface acidity, SO₂ poisoning

ZHOU Ju-Fa, ZHAO Ming, PENG Na, YANG Zheng-Zheng, GONG Mao-Chu, CHEN Yao-Qiang. Performance Effect of Pt/MO_x-SiO₂ (M=Ce, Zr, Al) Catalysts for CO and C₃H₈ Oxidation[J]. Acta Phys. -Chim. Sin. 2012, 28(06), 1448-1454. doi: 10.3866/PKU.WHXB201204011

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Performance Effect of Pt/MO_x-SiO₂ (M=Ce, Zr, Al) Catalysts for CO and C₃H₈ Oxidation

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Performance Effect of Pt/MOx-SiO2 (M=Ce, Zr, Al) Catalysts for CO and C3H8 Oxidation

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Performance Effect of Pt/MO_x-SiO₂ (M=Ce, Zr, Al) Catalysts for CO and C₃H₈ Oxidation