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本文研究了Pd/活性炭催化剂对烯烃催化加氢的性能,考察了双键碳原子上取代基与加氢速率的关系,探讨了添加吡啶系列化合物对加氢速率的影响,添加吡啶类化合物可提高烯烃的加氢速率;烯烃催化加氢速率随吡啶类化合物N原子上的电子密度Q_M增大而增大。并证明取代基团从双键碳原子上吸电子或由氮原子向金属钯供给孤对电子,都有利于Pd对>C—C<π~*轨道反馈电子而活化了双键。
In this paper, the catalytic performance of Pd / activated carbon catalysts for the catalytic hydrogenation of olefins was investigated. The relationship between the substituents on the double bonds and the hydrogenation rate was investigated. The effects of the addition of pyridine compounds on the hydrogenation rate were investigated. The addition of pyridine compounds could be improved The hydrogenation rate of olefins; the catalytic hydrogenation rate of olefins increased with the increase of the electron density Q_M on the N atom of pyridine compounds. And it was proved that the substituent could either withdraw electrons from the double bond carbon atom or supply the lone pair electron from the nitrogen atom to the metal palladium, which was in favor of Pd activating the double bond for the feedback electrons of> C-C <π ~ * orbital.