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用新型双金属催化剂Rh-Ni@MOF-5对不同碳链长度的烯烃氢甲酰化反应进行研究。用直接法合成的MOF-5晶体作催化剂载体,将Rh、Ni元素负载在MOF-5上合成Rh-Ni@MOF-5。采用TG、XRD、SEM、TEM和FTIR等手段对其进行表征,结果表明,负载金属后的催化剂拥有规整的立方体结构且热稳定性较强。采用3种烯烃的氢甲酰化反应对其催化性能进行评价,结果表明,Rh-Ni@MOF-5对烯烃的氢甲酰化反应具有良好的催化作用并且解决了反应后催化剂的分离回收问题。在一定条件下,其反应转化率均高于70%。与单金属催化剂Rh@MOF-5进行对比发现,双金属催化剂具有更高的催化活性,其收率和选择性均较单金属催化剂有明显优势。以1-己烯氢甲酰化反应为例,考查了Rh-Ni@MOF-5的使用寿命,结果表明,多次重复利用后仍能保持稳定的晶体结构和良好的催化性能。
A new bimetallic catalyst, Rh-Ni @ MOF-5, was used to study the hydroformylation of alkenes with different carbon chain lengths. The Rh-Ni @ MOF-5 was synthesized by loading MOF-5 on the surface of MOF-5 crystal synthesized by direct method. The catalysts were characterized by TG, XRD, SEM, TEM and FTIR. The results showed that the supported catalysts possessed the regular cubic structure and strong thermal stability. The catalytic performance of three olefins was evaluated by hydroformylation. The results showed that Rh-Ni @ MOF-5 has a good catalytic activity for the hydroformylation of olefins and solves the problem of catalyst separation and recovery after the reaction . Under certain conditions, the reaction conversion rate is higher than 70%. Compared with the single metal catalyst Rh @ MOF-5, the bimetallic catalyst has higher catalytic activity and the yield and selectivity are obviously superior to those of the single metal catalyst. Taking 1-hexene hydroformylation as an example, the service life of Rh-Ni @ MOF-5 was investigated. The results showed that the crystal structure and catalytic performance of Rh-Ni @ MOF-5 remained stable after repeated use.