Wu Zhilin, Cravotto Giancarlo, Gaudino Emanuela Calcio, Giacomino Agnese, Medlock Jonathan, Bonrath Werner
Dipartimento di Scienza e Tecnología del Farmaco and NIS - Centre for Nanostructured Interfaces and Surfaces, Universty of Turin, Via P. Giuria 9, I-10125 Turin, Italy.
Dipartimento di Scienza e Tecnología del Farmaco and NIS - Centre for Nanostructured Interfaces and Surfaces, Universty of Turin, Via P. Giuria 9, I-10125 Turin, Italy.
Ultrason Sonochem. 2017 Mar;35(Pt B):664-672. doi: 10.1016/j.ultsonch.2016.05.019. Epub 2016 May 20.
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 0.1-0.5MPa hydrogen pressure. Alkyne hydrogenation was suppressed by sonication under atmospheric hydrogen pressure, but promoted by sonication under 0.1MPa 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.
本文报道了超声在两种新型Pd/勃姆石催化剂上炔烃半加氢反应中的应用。苯乙炔、二苯乙炔和2-丁炔-1,4-二醇的半加氢反应，要么在常压氢气下于超声浴中进行研究，要么在0.1 - 0.5MPa氢气压力下于超声变幅杆反应器中进行研究。在常压氢气下，超声处理会抑制炔烃氢化，但在0.1MPa氢气压力下，超声处理会促进炔烃氢化。在这两种情况下，超声处理均提高了对半氢化产物的选择性。催化剂负载量、氢气压力、温度以及喹啉的存在，均会影响氢化速率、活性以及对半氢化产物的选择性。在普通搅拌和超声处理条件下，分别在乙醇和己烷中评估了催化剂中钯的浸出情况。
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