Co-Pb-ZSM-5分子筛的表征及其催化醛氨缩合反应活性的研究

Characterization of Co-Pb-ZSM-5 zeolite and its catalytic activity for aldehyde-ammonia condensation reaction

改性ZSM-5分子筛是一种具有较强催化活性的醛氨缩合催化剂,具有反应条件温和、择形选择性高、副产物较少等优点。醛氨缩合反应是制备烷基吡啶最具代表性的反应路线之一,用BET、SEM、XRD和IR等技术考察了Co-Pb-ZSM-5分子筛的物理化学特性,并将其用于醛氨缩合反应。结果表明,通过浸渍法使Co2+、Pb2+进入了ZSM-5分子筛骨架中,对醛氨缩合反应有较高的催化活性。采用Co-Pb-ZSM-5分子筛,烷基吡啶的产率可达75%以上。

ZSM-5 zeolite modified with metal has high catalytic activity in aldehyde-ammonia condensation reaction, and it has advantages of moderate reaction condition, high shape selectivity and little byproduct. Aldehyde-ammonia condensation reaction is one of the typical routes to produce alkylpyridine. The physical and chemical characteristics of Co-Pb on ZSM-5 zeolite are studied by BET, SEM, XRD and IR methods. The Co-Pb-ZSM-5 zeolite has been used to produce pyridine by aldehydes and ammonia. The result shows that dipping method can make Co 2+ and Pb 2+ enter the framework of the ZSM-5 zeolite, and Co-Pb-ZSM-5 zeolit shows relatively high activity in the conversion of aldehydes to pyridine bases, and the yield of alkyl pyridine can be more than 75%.