A Magnetically Recoverable Fe3O4-NH2-Pd Sorbent for Capture of Mercury from Coal Derived Fuel Gas

A sort of magnetical material named Fe3O4-NH2-Pd was prepared by loading varying amounts of immobilizing Pd on the surface of the magnetic Fe3O4-NH2 microspheres. This magnetical material was used firstly for capturing Hg degrees from coal derived fuel gas based on its recoverability. The experimental results showed that the loading Pd on the amine-functionalized magnetite nanoparticles can greatly improve the efficiency of removing Hg degrees at a high temperature range between 200 and 300 degrees C. The magnetic Fe3O4-NH2-Pd sorbent with 5% Pd loaded exhibited significantly high activity and stability in capturing Hg degrees, affording over 93% capture efficiency at 200 degrees C for more than 8 hrs. Compared to the Fe3O4-NH2 sorbent that converted the Hg degrees as HgS, this Fe3O4-NH2-Pd sorbent can remove the Hg degrees by forming Pd-Hg amalgam and HgS. In addition, the experimental tests indicated that the as-synthesized Fe3O4-NH2-Pd sorbent still showed stable magnetic properties after two regeneration cycles in removing Hg degrees, which provided the opportunity for preparing a recyclable sorbent which can be easily separated and recovered for Hg degrees removal.