Chlorobenzene hydrodechlorination on bimetallic catalysts prepared by laser electrodispersion of NiPd alloy

Golubina, E.V.; Rostovshchikova, T.N.; Lokteva, E.S.; Maslakov, K.I.; Nikolaev, S.A.; Egorova, T.B.; Gurevich, S.A.; Kozhevin, V.M.; Yavsin, D.A.; Yermakov, A.Y.

Авторы: Golubina Elena V., Rostovshchikova Tatiana N., Lokteva Ekaterina S., Maslakov Konstantin I., Nikolaev Sergey A., Egorova Tolganay B., Gurevich Sergey A., Kozhevin Vladimir M., Yavsin Denis A., Yermakov Anatoly Ye
Журнал: Pure and Applied Chemistry
Том: 90
Номер: 11
Год издания: 2018
Издательство: International Union of Pure and Applied Chemistry
Местоположение издательства: United States
Первая страница: 1685
Последняя страница: 1701
DOI: 10.1515/pac-2018-0207
Аннотация: NiPd bimetallic systems were for the first time synthesized by laser electrodispersion (LED) of theNi77Pd23 alloy target followed by the deposition of produced bimetallic particles on a TEM copper grid and alumina granules. Selective area energy-dispersive analysis confirms the bimetallic nature of NiPd particles deposited on a TEM copper grid. Their mean size is 1.0 nm according to TEM. XPS data demonstrate that under deposition on alumina granules (total metal content of 0.005 wt.%), nickel in bimetallic particles nearly completely oxidizes to Ni2+ species predominantly in the form of aluminate. At the same time major part of palladium (84 %) exists in Pd0 but oxidizes to Pd2+ (80 %) during 6 months storage in air. Both metals are deposited on the external surface of alumina granules and localized in the same areas. In situ reduction of both metals by H2 in the catalytic cell of XPS spectrometer is hindered. Nickel is not reduced even at 450 °C,confirming the formation of NiAlOx , whereas palladium is reduced at higher temperatures compared to a similar monometallic catalyst. Nevertheless, NiPd/Al2O3 catalyst is more efficient in gas-phase chlorobenzene hydrodechlorination at 150–350 °C than Ni/Al2O3 and even Pd/Al2O3, and much more stable. The difference may be caused by the formation of new active sites due to the contact between Pd0 and NiAlOx-modified support, and the protective action of spinel reacting with HCl by-product.
Добавил в систему: Локтева Екатерина Сергеевна

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Chlorobenzene hydrodechlorination on bimetallic catalysts prepared by laser electrodispersion of NiPd alloyстатья

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