Preparation of Pt/MoO3/ZrO2 Catalyst and its Property of Three-Way Catalysts

doi:10.3724/SP.J.1077.2008.01267

Abstract

Abstract: MoO₃/ZrO₂ was prepared by impregnation method. Its specific surface area, pore size, pore volume and surface acidity were investigated by means of low temperature nitrogen adsorption-desorption and NH₃-temperature programmed desorption. By using MoO₃/ZrO₂ and La₂O₃/Al₂O₃ as catalyst support, Pt/MoO₃/ZrO₂ and Pt/La₂O₃/Al₂O₃ catalysts were prepared by wet impregnation method and the activity test of C₃H₈, CO, NO were also investigated in the simulated automotive gas. The results show that MoO₃/ZrO₂ has good texture(S_BET=106.8m²/g) and surface super-acidity. And the catalysts were also characterized by X-ray diffraction and H₂-temperature programmed reduction. Compared with traditional three-way catalyst Pt/La₂O₃/Al₂O₃, Pt/MoO₃/ZrO₂ exhibits lower light-off temperature of hydrocarbon (230℃), carbon monoxide (200℃), and nitrogen oxides
(210℃) and wider operational air-to-fuel ratio window, which especially improves C₃H₈ conversion under higher oxidative conditions. The results also show that Pt on the catalyst support has high dispersion and excellent redox properties.

Key words: MoO₃/ZrO₂, Pt/MoO₃/ZrO₂ catalyst, air-to-fuels ratio

CLC Number:

O643
TQ426

WEN Yi-Yun,LIU Zhi-Ming,CAI Li,GUO Jia-Xiu,GONG Mao-Chu,CHEN Yao-Qiang. Preparation of Pt/MoO₃/ZrO₂ Catalyst and its Property of Three-Way Catalysts[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.01267.

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Preparation of Pt/MoO₃/ZrO₂ Catalyst and its Property of Three-Way Catalysts

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