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 (100–150°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.

Item Type:	Refereed Article
Keywords:	Ni and Ni–Pd catalysts, selective hydrogenation, phenylacetylene, modification of the support, heteropoly compound
Research Division:	Chemical Sciences
Research Group:	Physical chemistry
Research Field:	Catalysis and mechanisms of reactions
Objective Division:	Expanding Knowledge
Objective Group:	Expanding knowledge
Objective Field:	Expanding knowledge in the chemical sciences
UTAS Author:	Peristyy, AA (Dr Anton Peristyy)
ID Code:	104585
Year Published:	2012
Web of Science® Times Cited:	10
Deposited By:	Chemistry
Deposited On:	2015-11-16
Last Modified:	2017-11-02
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