Journal
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
Volume 86, Issue 12, Pages 1800-1807Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0036024412120187
Keywords
Ni and Ni-Pd catalysts; selective hydrogenation; phenylacetylene; modification of the support; heteropoly compound
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Funding
- RF Ministry of Education and Science [02.740.11.0026]
- Russian Foundation for Basic Research [10-03-00372, 11-03-00820]
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It 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 (100-150A degrees 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 100A degrees 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.
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