A facile in situ growth approach for preparing magnetic spherical activated carbon (MSAC)-metal organic framework (MOF) core-shell composite beads with millimeter size is described. This approach overcomes the challenge of processing MOF nanoparticles into shaped bodies with fast magnetic responsivity. The size of the MOF@MSAC beads can be easily tuned by changing the activated carbon core size. Furthermore, the thickness of the MOF shell can be designed by controlling the assembly cycle number and the precursor concentration of forming the MOF. In addition, different types of MOF, including monometallic (e.g., ZIF-67 and HKUST-1) as well as bimetallic ones (e.g., CoZn-ZIF) can be successfully self-assembled to form the shell. As a model catalyst, ZIF-67@MSAC displays satisfying activity in the Knoevenagel condensation reaction, good recyclability and remarkable convenience in separation and recovery. The applicability of the catalyst is contributed to its unique structural features, such as nanoscale active MOF, magnetic responsivity and the dispersing and stabilizing effects of the activated carbon support.

方便的原位描述了制备磁性球形活性炭（MSAC）-金属有机骨架（MOF）核-壳复合珠的方法。这种方法克服了将MOF纳米颗粒加工成具有快速磁响应性的成型体的挑战。通过更改活性炭芯的大小，可以轻松调整MOF @ MSAC珠的大小。此外，可以通过控制组装周期数和形成MOF的前体浓度来设计MOF壳的厚度。另外，包括单金属（例如ZIF-67和HKUST-1）以及双金属（例如CoZn-ZIF）在内的不同类型的MOF可以成功地自组装以形成壳体。作为模型催化剂，ZIF-67 @ MSAC在Knoevenagel缩合反应中显示出令人满意的活性，良好的可回收性，分离和回收方面的便利性。催化剂的适用性为其独特的结构特征做出了贡献，例如纳米级活性MOF，磁响应率以及活性炭载体的分散和稳定作用。