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 0.1–0.5 MPa hydrogen pressure. Alkyne hydrogenation was suppressed by sonication under atmospheric hydrogen pressure, but promoted by sonication under 0.1 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

Ultrasonically improved semi-hydrogenation of alkynes to (Z-)alkenes over novel lead-free Pd/Boehmite catalysts

WU, Zhilin;CRAVOTTO, Giancarlo;Gaudino, Emanuela Calcio;GIACOMINO, AGNESE;
2017-01-01

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 0.1–0.5 MPa hydrogen pressure. Alkyne hydrogenation was suppressed by sonication under atmospheric hydrogen pressure, but promoted by sonication under 0.1 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
2017
35
Pt B
664
672
www.elsevier.com/inca/publications/store/5/2/5/4/5/1
Alkynes; Catalyst activity; Catalyst selectivity; Semi-hydrogenation; Ultrasound; Chemical Engineering (miscellaneous); Radiology, Nuclear Medicine and Imaging; Acoustics and Ultrasonics
Wu, Zhilin; Cravotto, Giancarlo; Gaudino, Emanuela Calcio; Giacomino, Agnese; Medlock, Jonathan; Bonrath, Werner
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1660710
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