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首页> 外文期刊>Ultrasonics sonochemistry >Ultrasonically improved semi-hydrogenation of alkynes to (Z-)alkenes over novel lead-free Pd/Boehmite catalysts
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Ultrasonically improved semi-hydrogenation of alkynes to (Z-)alkenes over novel lead-free Pd/Boehmite catalysts

机译:超声物改善了新型无铅Pd / Boehmite催化剂的炔烃的半氢化至(Z-)烯烃

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This piper 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. (C) 2016 Elsevier B.V. All rights reserved.
机译:该吹笛者报告超声波在两种新型Pd / Boehmite催化剂上的半氢化中的应用。 在大气压下的超声波浴中或在0.1-0.5MPa氢气压力下的超声波反应器中,在超声浴中进行了半氢化的半氢化。 通过在大气压压力下超声处理抑制炔烃氢化,但是通过在0.1MPa的氢气压力下的超声处理促进。 超声处理在两种情况下对半氢化产品的选择性增加。 催化剂负载,氢气压力,温度和喹啉的存在,全部对氢化速率,活性和选择性对半氢化产物的影响。 在普通搅拌和超声处理下,在乙醇和己烷中评价从催化剂中浸出的钯浸出。 (c)2016年Elsevier B.v.保留所有权利。

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