Selective Hydrogenation of Phenylacetylene on Ni and Ni–Pd Catalysts Modified with Heteropoly Compounds of the Keggin Typeстатья
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Дата последнего поиска статьи во внешних источниках: 19 июля 2013 г.
Аннотация:—It is established that unmodified Ni catalysts and Ni catalysts modified with Mo and Whet
eropoly 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 demon
strates 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.
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