考察了常温常压下吡咯、呋喃和噻吩的催化加氢反应; 用紫外吸收光谱、气相色谱和酸碱度 测定分析了反应物质; 用比表面积测定、X射线衍射、透射电镜及高分辨电镜表征了催化剂. 结果表明,在纳米量级的镍基催化剂作用下,双键五元杂环的加氢反应过程是多反应同时进 行: 主要有环上双键先加氢生成四氢化物单键环,继而开环加氢生成若干小分子气体; 也有 直接开环反应. 总体上是在还原条件下实现降解反应. 超声波的介入有利于保持催化剂的活 性. 对反应机理进行了探讨.
Catalytic hydrogenation of pyrrole, furan and thiophene was investigated. It is verified that many reactions take place simultaneously for the hydrogenation of five-membered heterocycles on nanometer nickel-based catalyst. The double-bon d of the ring is hydrogenated to single-bond ring of tetrahydro-compound at fi rst, then the ring is broken and low-molecular gases are produced; while, there are also some reactions in which the ring is broken directly. In general, these reactions are degradation under reduction. UV absorbance spectroscopy, GC and p H detection are used to analyze the reactants and products, and the catalyst is characterized by specific surface area measurement, XRD, TEM and high-resolutio n electron microscopy (HREM). The experimental results indicate that the main pa th for hydrogenation of 5-membered heterocycles is on the cycle and open the cy cle later; and that the employment of ultrasonic wave is of benefit to the maint enance of catalytic activity. Furthermore, the reaction mechanism has also been investigated.
参考文献
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