Hydrodehalogenation of 4-chlorophenol and 4-bromophenol over Pd–Fe/Al2O3: influence of catalyst reduction conditions

[Display omitted] The reduction of monometallic Pd/Al2O3 and bimetallic PdFe/Al2O3 catalysts produced by co-impregnation or sequential impregnation of the support with metal salts was possible not only under high temperature hydrogen treatment but also at 30 °C under the action of aqueous phenol sol...

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Bibliographic Details
Published in:Mendeleev communications 2022-03, Vol.32 (2), p.249-252
Main Authors: Lokteva, Ekaterina S., Shishova, Vera V., Tolkachev, Nikolay N., Maslakov, Konstantin I., Kamaev, Alexey O., Maksimov, Sergey V., Golubina, Elena V.
Format: Article
Language:English
Subjects:
4-bromophenol
4-chlorophenol
alumina
catalyst reduction
catalytic hydrodechlorination
hydrodebromination
iron
palladium
water purification
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Summary:[Display omitted] The reduction of monometallic Pd/Al2O3 and bimetallic PdFe/Al2O3 catalysts produced by co-impregnation or sequential impregnation of the support with metal salts was possible not only under high temperature hydrogen treatment but also at 30 °C under the action of aqueous phenol solution and hydrogen. According to the XPS data, both reduction routes provided sufficient degrees of Pd reduction required for fast hydrodehalogenation of 4-chlorophenol and 4-bromophenol to phenol in aqueous solutions. The degree of Pd reduction was higher in the co-impregnated bimetallic PdFe catalyst, which was more efficient in transformation of 4-bromophenol; the bimetallic catalysts were more stable than the monometallic Pd one in the conversion of 4-chlorophenol.
ISSN:0959-9436
DOI:10.1016/j.mencom.2022.03.032