[Preparation method of Pd/Ce0.5Zr0.5O2 three-way catalysts].
1% Pd/Ce0.5Zr0.5O2(CZ) catalysts were prepared by deposition-precipitation (DP), mixing (MIX) and conventional impregnation (IMP) methods, and the effects of the preparation methods on the three-way catalytic behaviors were investigated. Hydrogen temperature-programmed reduction (H2-TPR) and in situ diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) were performed to understand the Pd-support interaction and the three-way catalytic reaction mechanisms. The experiments results reveal that the catalyst prepared by deposition-precipitation (DP) method shows the strongest Pd-support interaction and the best light-off performance. In situ DRIFTS results suggest that there exists alternative route of NOx reduction over Pd-DP catalyst. And it is supposed that Pd-support interaction leads to the difference of reaction mechanism and then the diversity of light-off performances.
Zhu
Bao-wei
BW
Research Center for Eco-Environmental Sciences, Chinese Academy of Scinences, Bejing 100085, China.
Chen
Hong-de
HD
Tian
Qun
Q
Fang
Shi-ping
SP
D000327:Adsorption; D000393:Air Pollutants / Q000737:chemistry*; D000397:Air Pollution / Q000517:prevention & control*; D002384:Catalysis; D002563:Cerium / Q000737:chemistry*; D007854:Lead / Q000737:chemistry*; D009569:Nitric Oxide / Q000737:chemistry; D010084:Oxidation-Reduction; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D015040:Zirconium / Q000737:chemistry*
D000393:Air Pollutants; D007854:Lead; D002563:Cerium; D009569:Nitric Oxide; D015040:Zirconium; C028541:zirconium oxide