Optimized synthesis of highly thermal stable CeO2 -ZrO2 /Al2 O3 composite for improved Pd-only three-way catalyst
As is well known, impregnation of precursors of Ce and Zr onto as-prepared Al2O3 powders is a commonly used approach to prepare CeO2-ZrO2/Al2O3 composite. In this work, a highly thermal stable CeO2-ZrO2/Al2O3 composite was synthesized by modifying the conventional preparation procedure, i.e., the precursor of Al2O3 thermal treated at comparatively lower temperature (200 °C) was applied to conduct the impregnation process. The characterization results of the supported Pd-only three-way catalysts reveal that in the modified sample, stronger interaction between CeO2-ZrO2 and Al2O3 is achieved, which consequently gives rise to higher thermal stability of the catalyst. Upon hydrothermal aging treatment, only slight aggregation of the CeO2-ZrO2 and Al2O3 particles takes place, meanwhile phase transformation of γ-Al2O3 and phase separation of CeO2-ZrO2 component are successfully suppressed. As a consequence, Pd species supported on the modified CeO2-ZrO2/Al2O3 composite remain finely dispersed, and more oxidative PdO species are maintained owing to the intimate interaction between Pd and CeO2-ZrO2. Therefore, improved reduction capability and superior three-way catalytic performance are achieved for the modified Pd/CeO2-ZrO2/Al2O3 catalyst after aging treatment.
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- Materials
- 4017 Mechanical engineering
- 4016 Materials engineering
- 0913 Mechanical Engineering
- 0912 Materials Engineering
- 0910 Manufacturing Engineering
Citation
Published In
DOI
EISSN
ISSN
Publication Date
Volume
Start / End Page
Related Subject Headings
- Materials
- 4017 Mechanical engineering
- 4016 Materials engineering
- 0913 Mechanical Engineering
- 0912 Materials Engineering
- 0910 Manufacturing Engineering