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(SBET=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.
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, 2008
, 23(6)
: 1267
-1271
.
DOI: 10.3724/SP.J.1077.2008.01267
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