Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 285, Issue -, Pages 182-189Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2014.10.062
Keywords
Pr; CZP molar ratio; Thermal stability; Pd-only TWCs; In situ diffuse reflectance infrared Fourier transform spectroscopy
Categories
Funding
- Ministry of Science and Technology of China [2011AA03A406]
- Zhejiang Leading Team of Science and Technology Innovation [2009R50020]
Ask authors/readers for more resources
Pd/CeO2-ZrO2-Pr2O3 (CZP) catalysts with different Ce/Zr molar ratios were synthesized and systematically ;investigated by XRD, N-2 adsorption-desorption, XPS, H-2-TPR, OSC and in situ DRIFTS techniques. The results of XPS, in situ DRIFTS, etc., show that the number of oxygen vacancies increases with the increasing Zr content and thus leads to the enhanced metal-support interaction and the accelerative formation rate of nitrate, formate, acetate and carbonate species, resulting in improving catalytic performance for HC and NO elimination, especially for Pd/CZP catalysts with Ce/Zr from 1/2 to 1/3. While Pd/CZP catalysts with higher OSC value (Ce/Zr=4/1-1/2) exhibit better catalytic activity of CO and NO2 elimination. An appropriate concentration of Zr facilitates the diffusion of Pr from the surface to the bulk of the CZP supports, thus forming more homogeneous CZP solid solution and improving the structure/textual stability, which promotes the thermal stability of catalysts. Pd/CZP catalysts with Ce/Zr from 2/1 to 1/2 exhibit good thermal stability. (C) 2014 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available