Hydrodechlorination of 4-Chlorophenol on Pd-Fe Catalysts on Mesoporous ZrO2SiO2 Support

Lokteva, E.S.; Shishova, V.V.; Tolkachev, N.N.; Kharlanov, A.N.; Maslakov, K.I.; Kamaev, A.O.; Kaplin, I.Y.; Savina, I.N.; Golubina, E.V.

Авторы: Lokteva Ekaterina S., Shishova Vera V., Tolkachev Nikolay N., Kharlanov Andrey N., Maslakov Konstantin I., Kamaev Alexey O., Kaplin Igor Yu, Savina Irina N., Golubina Elena V.
Журнал: Molecules
Том: 26
Номер: 1
Год издания: 2021
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Номер статьи: 141
DOI: 10.3390/molecules26010141
Аннотация: A mesoporous support based on silica and zirconia (ZS) was used to prepare monometallic 1 wt% Pd/ZS, 10 wt% Fe/ZS, and bimetallic FePd/ZS catalysts. The catalysts were characterized by TPR-H2, XRD, SEM-EDS, TEM, AAS, and DRIFT spectroscopy of adsorbed CO after H2 reduction in situ and tested in hydrodechlorination of environmental pollutant 4-chlorophelol in aqueous solution at 30 °C. The bimetallic catalyst demonstrated an excellent activity, selectivity to phenol and stability in 10 consecutive runs. FePd/ZS has exceptional reducibility due to the high dispersion of palladium and strong interaction between FeOx and palladium, confirmed by TPR-H2, DRIFT spectroscopy, XRD, and TEM. Its reduction occurs during short-time treatment with hydrogen in an aqueous solution at RT. The Pd/ZS was more resistant to reduction but can be activated by aqueous phenol solution and H2. The study by DRIFT spectroscopy of CO adsorbed on Pd/ZS reduced in harsh (H2, 330 °C), medium (H2, 200 °C) and mild conditions (H2 + aqueous solution of phenol) helped to identify the reasons of the reducing action of phenol solution. It was found that phenol provided fast transformation of Pd+ to Pd0. Pd/ZS also can serve as an active and stable catalyst for 4-PhCl transformation to phenol after proper reduction.
Добавил в систему: Маслаков Константин Игоревич

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Hydrodechlorination of 4-Chlorophenol on Pd-Fe Catalysts on Mesoporous ZrO2SiO2 Supportстатья

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