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|Title:||Chlorobenzene hydrodechlorination on bimetallic catalysts prepared by laser electrodispersion of NiPd alloy|
|Authors:||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.
|Citation:||Chlorobenzene hydrodechlorination on bimetallic catalysts prepared by laser electrodispersion of NiPd alloy / E. V. Golubina, T. N. Rostovshchikova, E. S. Lokteva et al. // Pure and Applied Chemistry. — 2018. — Vol. 90. — Iss. 11. — P. 1685-1701.|
|Abstract:||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. © 2018 IUPAC and De Gruyter.|
PARTICLES (PARTICULATE MATTER)
X RAY PHOTOELECTRON SPECTROSCOPY
|metadata.dc.description.sponsorship:||Funding: This work was financially supported by RFBR, Funder Id: 10.13039/501100002261 (grant 16-03-00073) and in part by Institute of Metal Physics in the frame of “Magnit” Program.|
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
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