The effect of H2 treatment at 423–573 K on the structure and synergistic activity of Pd–Cu alloy catalysts for low-temperature CO oxidation

Nikolaev, S.A.; Golubina, Е.V.; Shilina, М.I.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Web of Science, Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 3 мая 2017 г.

Авторы: Nikolaev S.A., Golubina Е.V., Shilina М.I.
Журнал: Applied Catalysis B: Environmental
Том: 208
Год издания: 2017
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 116
Последняя страница: 127
DOI: 10.1016/j.apcatb.2017.02.038
Аннотация: The effect of H2 treatment at 423–573K on the structure of Cu/Pd/Al2O3 catalysts for low-temperature CO oxidation was studied by means of XRD, TEM, EDS, FFT, DRIFTS, and XPS methods. The formation of 5-nm alloy particles in the Cu/Pd catalyst reduced at 423 K was detected. The reaction on Cu/Pd, Pd, and Cu catalyst reduced at 423 K starts at 275, 400, and 475 K, respectively. The activation energy for CO oxidation on Cu/Pd, Pd and Cu catalyst is 30, 90 and 110 kJ/mol, respectively. The enhanced activity of Cu/Pd catalyst is explained by oxidation on Pd0-MOx interfaces (M=Pd, Cu). The key steps of this process are: oxidation of CO molecules strongly bound to Pd0 by lattice oxygen of MOx; fast desorption of CO2 molecules; replenishment of oxygen vacancies in MOx by oxygen molecules from reaction media. As a result, a substantial part of “blocked” Pd0 sites become available for adsorption and dissociation of O2 molecules. This is favorable for low-temperature oxidation via Langmuir-Hinshelwood mechanism. The increase in the reduction temperature results in a separation of alloy particles into metallic particles. As a result, Cu/Pd catalysts reduced at high temperatures are characterized with a decreased content of Pd0-MOx interfaces; an essential amount of “blocked” Pd0 sites and a decreased light-off activity.
Добавил в систему: Николаев Сергей Александрович

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The effect of H2 treatment at 423–573 K on the structure and synergistic activity of Pd–Cu alloy catalysts for low-temperature CO oxidationстатья

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