Video Swirling Fluidized Bed Reactor

A swirling fluidized bed reactor design for the preparation of supported nanoparticles is reported. It uses a DC plasma torch that decomposes and vaporizes salt precursors; the cationic part condenses as metal nanoparticles on a powder support. Any fluidizable granular material can be used as support, as long as it withstands the temperatures of the plasma torch. The torch is located at the center of the reactor axis and the powder is fluidized using a cyclonic action (swirl) to minimize the space where the grains could come into direct contact with the plasma zone. The reactor was tested for the production of silver nanoparticles (AgNPs) supported on silica-alumina, using silver nitrate as precursor.本研究报道了一种用于制备负载型纳米颗粒的旋流流化床反应器设计方案。该设计采用直流等离子炬（DC plasma torch）对盐类前驱体进行分解与汽化，其中阳离子组分以金属纳米颗粒的形式在粉体载体上冷凝析出。只要能够耐受等离子炬的工作温度，任意可流化的颗粒材料均可作为载体使用。等离子炬置于反应器轴线的中心位置，粉体通过旋流作用实现流化，以此尽可能缩小颗粒与等离子体区域直接接触的空间。本研究以硝酸银为前驱体，针对负载于硅铝载体上的银纳米颗粒（AgNPs）的制备对该反应器进行了性能测试。