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Selective hydrogenation of phenylacetylene on Ni and Ni-Pd catalysts modified with heteropoly compounds of the Keggin type
journal contribution
posted on 2023-05-18, 14:25 authored by Navalikhina, MD, Kavalerskaya, NE, Lokteva, ES, Peristyy, AA, Golubina, EV, Lunin, VVIt is established that unmodified Ni catalysts and Ni catalysts modified with Mo- and W-heteropoly compounds (HPC) of the Keggin type (6 wt %) along with catalyst containing 6% K4SiW12O40/Al2O3 appear to be active in the reaction of phenylacetylene (PA) hydrogenation. At low temperatures (100–150°C), the selectivity of the process strongly depends on the nature of the modifier or second active metal (Pd). It is demonstrated that in the presence of 6% Ni-0.015% Pd/Al2O3 modified by HPC K4SiMo6W6O40, the conversion of PA at 100°C was 87% at a styrene: ethylbenzene ratio of 1: 1. The acidity of HPC is found to influence the side reactions of alkylation and condensation. Transmission electron microscopy demonstrates that Ni in modified HPC 6% Ni/Al2O3 is present in the form of the particles below 2 nm in size, and these particles of Ni become larger when affected by the reaction medium during PA hydrogenation.
History
Publication title
Russian Journal of Physical Chemistry AVolume
86Issue
12Pagination
1800-1807ISSN
0036-0244Department/School
School of Natural SciencesPublisher
InterperiodicaPlace of publication
Po Box 1831, Birmingham, USA, Al, 35201-1831Rights statement
Copyright 2012 Pleiades Publishing, LtdRepository Status
- Restricted