Реферат: NiPd bimetallic systems were for the first time synthesized by laser electrodispersion (LED) of the Ni 77 Pd 23 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 Ni 2+ species predominantly in the form of aluminate. At the same time major part of palladium (84%) exists in Pd 0 but oxidizes to Pd 2+ (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 H 2 in the catalytic cell of XPS spectrometer is hindered. Nickel is not reduced even at 450°C, confirming the formation of NiAlO x , whereas palladium is reduced at higher temperatures compared to a similar monometallic catalyst. Nevertheless, NiPd/Al 2 O 3 catalyst is more efficient in gas-phase chlorobenzene hydrodechlorination at 150-350°C than Ni/Al 2 O 3 and even Pd/Al 2 O 3 , and much more stable. The difference may be caused by the formation of new active sites due to the contact between Pd 0 and NiAlO x -modified support, and the protective action of spinel reacting with HCl by-product.

Библиографическая ссылка: 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.
Chlorobenzene hydrodechlorination on bimetallic catalysts prepared by laser electrodispersion of NiPd alloy
Pure and Applied Chemistry. 2018. V.90. N11. P.1685-1701. DOI: 10.1515/pac-2018-0207 Scopus OpenAlex

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Scopus:	2-s2.0-85052987224
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