Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5144938 | Ultrasonics Sonochemistry | 2017 | 9 Pages |
Abstract
This paper reports the application of ultrasound in the semi-hydrogenation of alkynes over two novel Pd/Boehmite catalysts. The semi-hydrogenations of phenylacetylene, diphenylacetylene and 2-butyne-1,4-diol have either been investigated in an ultrasonic bath under atmospheric hydrogen pressure, or in an ultrasonic horn reactor under 0.1-0.5Â MPa hydrogen pressure. Alkyne hydrogenation was suppressed by sonication under atmospheric hydrogen pressure, but promoted by sonication under 0.1Â MPa of hydrogen pressure. Sonication increased selectivity towards the semi-hydrogenated products in both cases. Catalyst loading, hydrogen pressure, temperature and the presence of quinoline, all impacted on hydrogenation rate, activity and selectivity to semi-hydrogenated products. Palladium leaching from the catalyst was evaluated in ethanol and hexane both under plain stirring and sonication.
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Authors
Zhilin Wu, Giancarlo Cravotto, Emanuela Calcio Gaudino, Agnese Giacomino, Jonathan Medlock, Werner Bonrath,