【摘 要】
：
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 conv
【机 构】
：
Energy Research Institute,Nanjing Institute of Technology,Nanjing,211167,China;Institute of Catalysi
论文部分内容阅读
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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