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首页> 外文期刊>Catalysis science & technology >Selective hydrogenation of alkynes over ppm-level Pd/boehmite/Al2O3 beads in a continuous-flow reactor
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Selective hydrogenation of alkynes over ppm-level Pd/boehmite/Al2O3 beads in a continuous-flow reactor

机译：选择性加氢的炔烃ppm在连续流动Pd /勃姆石/氧化铝珠子反应堆

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摘要

A ppm-level Pd/boemite catalyst has been prepared over 3 mm alumina beads and used for the selective hydrogenation of alkynes in a continuous-flow reactor with two modes: closed-loop and flow-through. The flow rates of the alkyne solution and hydrogen gas are critical factors in the control of conversion and selectivity. In closed-loop mode, over 90% selectivity to alkene was achieved at over 90% conversion of phenylacetylene (PA) and 2-butyne-1,4-diol (ByD) in closed-loop mode, whereas diphenylacetylene (DPA) gave only 83% selectivity to (Z)-stilbene. The maximum outputs obtained for the hydrogenations of 22 mM PA, DPA and ByD at 60 degrees C, with 10 vol% H-2 gas bubble at atmospheric pressure in the concurrent flow, were 37.8, 37.5 and 47.0 mmol min(-1) g(-1) Pd, respectively. In flow-through mode, the optimal H-2 flow percentage in the concurrent flow was 44-45 vol%, while the optimal H-2/ByD molar ratio was 1.6-1.7 for both concurrent flow rates of 0.4 and 0.7 mL min-1. 90% selectivity to 2-butene-1,4-diol was achieved at over 90% ByD conversion. The maximum output was 25.2 mmol min(-1) g(-1) Pd. Palladium leaching from the catalyst was evaluated in n-hexane and ethanol under the flow conditions over 100 hours of hydrogenation.
机译：ppm Pd / boemite催化剂已经准备氧化铝珠子和用于超过3毫米炔烃的选择性加氢连续流反应器有两种模式:闭环和主要材料。炔烃的解决方案和氢气是至关重要的在转换和控制因素选择性。对烯烃选择性达到90%以上苯乙炔转换(PA)和2-butyne-1 4-diol(比亚迪)闭环模式,而diphenylacetylene (DPA)只有83%(Z)对称二苯代乙烯选择性。获得了22毫米的加氢PA,德通社比亚迪在60摄氏度,10卷% 2气体泡沫在大气压力并发流,分别为37.8、37.5和47.0更易与最小值(1)g (1)分别Pd。最优2流并发的百分比流44-45卷%,而最优2 /比亚迪并发流的摩尔比率为1.6 - -1.70.4和0.7毫升最低为1。比亚迪2-butene-1, 4-diol实现超过90%转换。分钟(1)g (1) Pd。催化剂是评估在正己烷和乙醇在流动条件下超过100小时加氢。

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