Construction of bimetallic Pt-Pd/CeO2-ZrO2-La2O3 catalysts with different Pt/Pd ratios and its structure-activity correlations for three-way catalytic performance

被引：12

作者：

Chen, Kai ^{[1
]}

Wan, Jie ^{[1
,2
]}

Wang, Ting ^{[1
]}

Sun, Qi ^{[2
,3
]}

Zhou, Renxian ^{[1
]}

机构：

[1] Zhejiang Univ, Inst Catalysis, Hangzhou 310028, Peoples R China

[2] Nanjing Inst Technol, Energy Res Inst, Nanjing 211167, Peoples R China

[3] Nanjing Inst Technol, Sch Environm Engn, Nanjing 211167, Peoples R China

来源：

JOURNAL OF RARE EARTHS | 2023年 / 41卷 / 06期

关键词：

Three-way catalyst; Bimetallic; Metal-support interaction; Dispersion; Dynamic oxygen storage; release capacity; Rare earths; IN-SITU DRIFTS; PD; SUPPORT; REDUCTION; NO; CO; OXIDATION; COMBUSTION; CHALLENGES; MORPHOLOGY;

D O I：

10.1016/j.jre.2022.10.014

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

A series of Pt-Pd bimetallic catalysts supported on CeO2-ZrO2-La2O3 mixed oxides were synthesized through the conventional impregnation method. Three-way catalytic performance evaluations along with detailed physio-chemical characterizations were carried out to establish possible structure-activity correlations. Results show that on the one hand, different Pt/Pd ratios can strongly affect the TWC behaviors of Pt-Pd/CZL catalysts by modulating the synergistic effect between Pt and Pd. On the other hand, higher Pt/Pd ratio also favors better dispersion of precious metals. Such improved precious metals (PM) dispersion can promote the metal-support interaction and increase the surface oxygen vacancies concentration, thereby raising the dynamic oxygen storage/release capacity, improving the redox ability as well as enhancing the thermal stability of the Pt-Pd/CZL catalyst. Moreover, the strong metal-support interaction can augment surface oxygen vacancy concentration, thereby benefiting low temperature CO and NO reaction via augmented NOx adsorption and nitrate conversion.(c) 2022 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.

引用

页码：896 / 904

页数：9

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