Preparation and Characterization of Rh-Au/冏-Al2O3 Three-Way Nanocatalysts

Abstract

Abstract:

Rh/-Al2O3 and Rh-Au/-Al2O3 catalysts were prepared by the ultrasound-assisted membrane reduction (UAMR) and the incipient wetness impregnation (IMP) methods. The properties of the catalysts for three-way catalytic model reactions (CO and C3H8 oxidation, CO + NO, and C3H6+NO+O2) were investigated. The catalysts were characterized by inductively coupled plasma-optical emission spectrometry, H2-O2 titration, N2 adsorption, and transmission electron microscopy. The metal dispersion of the Rh/-Al2O3-UAMR and Rh-Au/ -Al2O3-UAMR catalysts was 45.3% and 40.1% with the metallic surface area of 199.6 and 133.0 m2/g, respectively, and the average metal particle size was smaller than 3 nm. Compared with Rh/-Al2O3-IMP and Rh-Au/-Al2O3-IMP, the Rh/-Al2O3-UAMR and RhAu/-Al2O3- UAMR catalysts possessed much higher catalytic activity for the model reactions. However, the activity of the Rh-Au/-Al2O3- UAMR catalyst was higher than or similar to that of the Rh/-Al2O3-IMP for the model reactions, indicating that the UAMR is a promising method for fabrication of three-way catalysts. The catalysts were deactivated to some extent by hydrothermal pretreatment at 1 000 oC.

Key words: three-way catalyst, rhodium, gold, alumina, membrane reduction, impregnation

LIU Licheng;ZI Xuehong;DAI Hongxing;ZHAO Zhen;WANG Xinping;HE Hong;*. Preparation and Characterization of Rh-Au/冏-Al2O3 Three-Way Nanocatalysts[J]. Chinese Journal of Catalysis, 2010, 31(7): 781-787.

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Preparation and Characterization of Rh-Au/冏-Al2O3 Three-Way Nanocatalysts

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