Studies on High-Temperature Evolution of Low-Loaded Pd Three-Way Catalysts Prepared by Laser Electrodispersion

Rostovshchikova, T.N.; Shilina, M.I.; Gurevich, S.A.; Yavsin, D.A.; Veselov, G.B.; Stoyanovskii, V.O.; Vedyagin, A.A.

Авторы: Rostovshchikova Tatiana N., Shilina Marina I., Gurevich Sergey A., Yavsin Denis A., Veselov Grigory B., Stoyanovskii Vladimir O., Vedyagin Aleksey A.
Журнал: Materials
Том: 16
Номер: 9
Год издания: 2023
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Номер статьи: 3501
DOI: 10.3390/ma16093501
Аннотация: Pd/Al2O3 catalyst of the “crust” type with Pd loading of 0.03 wt.% was prepared bythe deposition of 2 nm Pd particles on the outer surface of the alumina support using laser electrodispersion (LED). This technique differs from a standard laser ablation into a liquid in that the formation of monodisperse nanoparticles occurs in the laser torch plasma in a vacuum. As is found,the LED-prepared catalyst surpasses Pd-containing three-way catalysts, obtained by conventional chemical synthesis, in activity and stability in CO oxidation under prompt thermal aging conditions.Thus, the LED-prepared Pd/Al2O3 catalyst showed the best thermal stability up to 1000 C. The present research is focused on the study of the high-temperature evolution of the Pd/Al2O3 catalyst in two reaction mixtures by a set of physicochemical methods (transmission electron microscopy, X-ray photoelectron spectroscopy, and diffuse reflectance UV-vis spectroscopy). In order to follow the dispersion of the Pd nanoparticles during the thermal aging procedure, the testing reaction of ethane hydrogenolysis was also applied. The possible reasons for the high stability of LED-preparedcatalysts are suggested.
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