Hierarchical hollow bimetallic NiCo/Mg_xNi_yO catalysts were constructed by assembling NiMgCo layered double hydroxide (LDH) platelets on zeolitic imidazolate framework-67 (ZIF-67), followed by subsequent calcination and reduction. The three-level hierarchical structure of NiCo/Mg_xNi_yO catalysts, including the hollow structure, nanolamellar structure and NiCo alloy particles, showed a significant enhancement on the catalytic activity of NiCo/Mg_xNi_yO in the hydrogenation of phenol to cyclohexanol. The confined environment of the lamellar structure may strengthen the interaction between the active species and support, avoiding the agglomeration, sintering and leaching of the NiCo active species, thus facilitating the stability. The optimal catalyst NiCo/Mg_xNi_yO(10) showed an excellent catalytic performance with 99.9 % conversion and 99.9 % selectivity for cyclohexanol, and featured with a highest TOF value of 588 h⁻¹ compared with the reported Ni-based catalysts. Detailed characterizations have demonstrated that the combination of the hollow structure and the confined effect would benefit the catalytic performance. Moreover, this non-precious metal catalyst can be magnetically separated, and recycled for at least 6 times. This approach provides a valuable guidance for the design and preparation of the non-precious metal catalysts for industrial applications.

分层中空双金属NiCo / Mg _x Ni _y O催化剂是通过将NiMgCo层状双氢氧化物（LDH）血小板组装在沸石咪唑酯骨架67（ZIF-67）上，随后进行煅烧和还原而制得的。NiCo / Mg _x Ni _y O催化剂的三级分层结构，包括中空结构，纳米层状结构和NiCo合金颗粒，均显着提高了NiCo / Mg _x Ni _y的催化活性。在苯酚加氢成环己醇时。层状结构的封闭环境可以加强活性物质与载体之间的相互作用，避免NiCo活性物质的团聚，烧结和浸出，从而有利于稳定性。最佳催化剂NiCo / Mg _x Ni _y O（10）表现出优异的催化性能，转化率为99.9％，对环己醇的选择性为99.9％，TOF值最高为588 h ^-1与报道的镍基催化剂相比。详细的特征表明，中空结构和有限作用的结合将有利于催化性能。而且，该非贵金属催化剂可以被磁分离，并循环至少6次。该方法为工业应用的非贵金属催化剂的设计和制备提供了有价值的指导。