期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 105, 期 1-2, 页码 151-162出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2011.04.006
关键词
CeO2-ZrO2; Oxygen storage capacity; Supercritical drying; Pd-only three-way catalysts
资金
- Ministry of Science and Technology of China [2009AA064804]
CeO2-ZrO2 doped by nickel oxide (CZN) with different method and Pd-only three-way catalysts (Pd/CZN) were prepared and characterized. The catalyst prepared by co-precipitation and supercritical drying process (Pd/CZN-s) exhibits the best catalytic activity and the widest operation working window before and after aging. Compared with other samples. CZN-s shows the formation of more homogeneous ternary solid solution with the smallest lattice parameter and crystallite size. Moreover. CZN-s maintains the high thermal and structural stability with higher surface area and larger pore volume after aging. Pd/CZN-s exhibits higher relative concentration of Ce3+ associated with the formation of more oxygen vacancies before and after aging, confirmed by X-ray photoelectron spectroscopy and Raman results. The more concentration of Ce3+ or oxygen vacancies leads to the enhancement of oxygen storage complete capacity of CZN-s. Moreover, the higher the oxygen storage capacity, the wider the working ranges of air/fuel variations. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.
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