The Effect of Surfactants with Different Carbon Chain Lengths on the Properties of CeO2-ZrO2-Y2O3-La2O3 Materials
Journal Title: Automobile Technology & Material - Year 2024, Vol 39, Issue 2
Abstract
The effects of alkyl acid surfactants with different carbon chain lengths (decanoic acid, dodecanoic acid, tetradecanoic acid, hexadecanoic acid, octadecanoic acid) on the properties of CeO2- ZrO2- Y2O3- La2O3 (CZ) materials were studied and analyzed, and the underlying mechanism of surfactants in building high performance CZ materials has also been revealed. The results of N2- adsorption/desorption, OSC, H2- TPR, and catalyst activity show that the addition of all surfactants with different carbon chain lengths during the nucleation stage of nanocrystals can increase the initial grain size of nanocrystals, thereby reducing the driving force of sintering. At the same time, the introduction of surfactants produces more oxygen vacancies in the material, thereby improving its redox performance.Among them, dodecanoic acid plays the most prominent effects improving the thermal stability and redox performance of CZ materials, the resultant CZ exhibits the lowest loss rate of specific surface area of 46.3%, the lowest reduction peak temperature of 497℃, the highest utilization rate of Ce of 39%, and consequently the best catalytic activity of its supported Pd-only TWC.
Authors and Affiliations
Xiong Feng, Chen Chao, Liu Dandan, Zhao Haoyuan, Zhang Xu
Keywords
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- EP ID EP731938
- DOI 10.19710/J.cnki.1003-8817.20230375
- Views 56
- Downloads 0
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