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首页> 外文期刊>Catalysis science & technology >Solvent effects on heterogeneous catalysis in the selective hydrogenation of cinnamaldehyde over a conventional Pd/C catalyst
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Solvent effects on heterogeneous catalysis in the selective hydrogenation of cinnamaldehyde over a conventional Pd/C catalyst

机译：溶剂对多相催化的影响肉桂醛的选择性加氢传统的Pd / C催化剂

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摘要

Solvent effects in the selective hydrogenation of an ,-unsaturated aldehyde of cinnamaldehyde (CAL) were investigated under gas-liquid-solid reaction conditions. A conventional 5 wt% Pd/C catalyst and twelve organic solvents were used, including apolar solvents (three) and protic (two) and aprotic (seven) polar ones. The total rate of CAL hydrogenation strongly depended on the solvents used. The relationship between the rate of CAL hydrogenation observed and a few different solvent parameters was examined. The main product was hydrocinnamaldehyde (HCAL) with a selectivity of 80% or higher in most of the solvents examined except for pyridine and 4-methylpyridine. In these two solvents, the CAL hydrogenation was slow and the main product was changed to cinnamyl alcohol (COL) with a selectivity of about 60%. The addition of a small volume of pyridine to other solvents such as 2-propanol and tetrahydrofuran could change the rate of hydrogenation and switch the main product from HCAL to COL. Possible interactions among the solvents, CAL substrate, and Pd/C catalyst were examined by FTIR (attenuated total reflection (ATR-) and diffuse reflectance modes (DR-)) and TPD to discuss the solvent effects observed in the Pd-catalyzed heterogeneous CAL hydrogenation.
机译：溶剂选择性加氢的影响一、不饱和醛肉桂醛(CAL)了下gas-liquid-solid反应条件。和十二个有机溶剂使用,包括非极性溶剂(三)和质子(两个)和质子(七)极性的。加氢强烈依赖于溶剂使用。加氢观察和一些不同的溶剂参数检查。与选择性hydrocinnamaldehyde (HCAL)大部分的溶剂80%或更高的检查吡啶和4-methylpyridine除外。这两个溶剂,卡尔加氢缓慢,主要产品是肉桂酒精(COL)的选择性为60%。添加吡啶的体积小丙胺等溶剂四氢呋喃可以改变的速度加氢和开关的主要产品HCAL上校可能的相互作用溶剂、卡尔衬底,在钯碳催化剂通过红外光谱(衰减全反射(ATR)和(-)博士)和漫反射率模式一系列问题,讨论了溶剂效应中观察到Pd-catalyzed异构卡尔加氢。

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