Journal
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
Volume 31, Issue 5, Pages 656-663Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.pnsc.2021.08.002
Keywords
Three-way catalysts; Palladium; CeO2-ZrO2; Morphology; Structure-activity relationship
Funding
- Key Program of Science Technology Department of Zhejiang Province [2018C03037]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [20KJB610005]
- Natural Science Foundation of Jiangsu Province [BK20201037]
- Scientific Research Fund of Nanjing Institute of Technology [YKJ2019111, YKJ2019110]
- Key Research and Development Program of Anhui Province [202104g01020006]
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The morphology of CeO2-ZrO2 mixed oxides affects the three-way catalytic performance of Pd/CeO2-ZrO2 catalysts, with different crystal planes exposure contributing to the formation of surface oxygen vacancies and enhancing catalytic activity.
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.
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