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Morphology controllable synthesis of Pd/CeO2–ZrO2 catalysts and its structure-activity relationship in three-way catalytic performance
- Source :
- Progress in Natural Science: Materials International, Vol 31, Iss 5, Pp 656-663 (2021)
- Publication Year :
- 2021
- Publisher :
- Elsevier, 2021.
-
Abstract
- CeO2–ZrO2 mixed oxides with controlled morphologies (i.e., nanorod, nano-polyhedral and disordered shape) were synthesized through either hydrothermal or coprecipitation method, and the corresponding supported Pd/CeO2–ZrO2 catalysts were also prepared by conventional impregnation. The obtained catalysts were subjected to systematic structural/physio-chemical characterizations as well as three-way catalytic performance evaluations. The results showed that CeO2–ZrO2 mixed oxides presented different exposed crystal planes: namely disordered CZ-di mainly exposed (111) crystal planes, nanorod CZ-ro mainly exposed (111) crystal planes and few (100) crystal planes, while nano-polyhedral CZ-po exposed both (111) and (100) crystal planes. Clear structure-activity relationship could be demonstrated between the TWC (Three-way catalysts) performance of Pd/CeO2–ZrO2 and such different microstructures, as (100) and (111) crystal planes exposed by CZ-ro and CZ-po were beneficial for the surface oxygen vacancies formation, thus increasing the Pd-support interaction and effectively decreasing the light-off temperature of HC and NO elimination. On the other hand, the disordered CZ-di retained more lattice oxygen content, leading to better catalytic activity of CO elimination for the corresponding Pd/CZ-di catalyst.
- Subjects :
- Morphology
Materials science
Morphology (linguistics)
Coprecipitation
Three-way catalysts
Microstructure
Structure-activity relationship
Hydrothermal circulation
Catalysis
Crystal
Crystallography
TA401-492
Structure–activity relationship
CeO2–ZrO2
General Materials Science
Nanorod
Materials of engineering and construction. Mechanics of materials
Palladium
Subjects
Details
- Language :
- English
- ISSN :
- 10020071
- Volume :
- 31
- Issue :
- 5
- Database :
- OpenAIRE
- Journal :
- Progress in Natural Science: Materials International
- Accession number :
- edsair.doi.dedup.....905973bd74e2416942ff4bf66274a311