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Article Abstract
The high thermal stability of halloysite (H)-supported core-shell Pd@CeO endowed it with promising catalytic performance and superior sintering resistance as a three-way catalyst. In this work, the synthesis of Pd@CeO nanoparticles with various shell thicknesses was performed, and the properties of the shell and support were examined. From the results, the Pd@6CeO/H catalyst (Ce/Pd = 6) without any pretreatment or activation was achieved with a well-dispersed and optimal shell thickness of Pd@6CeO nanoparticles to inhibit sintering and aggregation via electrostatic attractions with halloysite. Moreover, the halloysite support imparted thermal stability for enhanced catalytic stability under long-term and high-temperature reaction conditions compared with Pd@6CZ/H (cerium-zirconium shell) and Pd@6CeO/AlO catalysts. To further ascertain the electronic effect on halloysite, Pd@6CeO/H-12 (halloysite solution at pH = 12) was prepared. The results showed that Pd@6CeO/H-12 enhanced the catalytic activity and decreased the light-off temperature compared with the other studied catalysts, and these results were attributed to the high content of Ce and oxygen vacancies and the strong interaction between Pd@6CeO and halloysite, making it a promising three-way catalyst.
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| http://dx.doi.org/10.1016/j.scitotenv.2019.136137 | DOI Listing |
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