Abstract:

A new preparation method of H₂O₂/Se modified vanadium based catalysts was proposed in this paper. The catalysts were characterized by XRF, XRD, SEM, MIP and TG/DSC, and tested for catalytic oxidation of SO₂ to SO₃. And its activity was compared with that of the commercial catalysts CHP-75 and VK-38.Results show that the catalysts V-Se/SiO₂ and V@x H₂O₂-Se/SiO₂ have clear surface pores and small grain size of active components, which provide more active sites for SO₂ oxidation. Meanwhile, it also has lower melting transition temperature and more forms of molten state, which is conducive to improving their low temperature activity. Among them, the catalysts V@10% H₂O₂-Se/SiO₂ has the highest activity for SO₂ oxidation due to its optimal pore structure, pore volume, active component nanoparticle size and melting transition temperature. And the catalytic activity of this catalyst is rival to the activity of VK-38 and much high than that of CHP-75. It offers a new thought and method for the design of the high efficiency vanadium catalyst.

Key words: compound modification, vanadium catalyst, low temperature activity