A new approach to maintaining the structural integrity of fragile nanostructured heterogeneous catalysts with nanoscale magnetic stir bars

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2019,（4）
• 页码范围: 229-231
• 页数: 3页
• 语种: 英文

摘要

Three-dimensional (3D) self-assembled nanomaterials with hierarchical architectures are very attractive materials due to their superior physical and chemical properties [1-7].Over the past few years,a variety of nanomaterials with well-controlled structures were developed and applied in many areas,including water treatment,energy,sensor and catalysis [8-16].However,robustness and delicacy seem to be exclusive properties for the 3D architectures assembled by nano-sized building blocks.Those delicate structures are usually fragile,and suffer from structural destruction when being exposed to high temperature,strong oxidizing reagents or stress force [17].Researches have been focused on the rational ways to enhance the structural stability of the hierarchical structures [2,18,19].Taking the hierarchical flower-like MgO as an example,the O2-sites on the surface and hierarchical structures make it a very good heterogeneous base catalyst,but its crisp and fragile structure restrict its utilization in the batch reaction system with forcedly stirring [20].To keep the 3D flower-like structures,several approaches,including SiO2 coating [21] and conversion to the hollow spheres [22] were usually adopted.These methods all aimed to enhance the endurance of the catalysts against the stress force from stirring bars.