The role of vanadium species during SO2 removal over a V2O5/AC catalyst

摘要

The role of vanadium species during SO2 removal over a V2O5/AC catalyst was studied in detail using in situ diffuse reflectance infrared Fourier transform spectroscopy, Raman spectroscopy, temperature programmed desorption, X-ray photoelectron spectroscopy and N-2 adsorption. Results revealed that V2O5 reacted with SO2 to form a stable vanadium(v) sulfate of V2O3(SO4)(2). However, V2O3(SO4)(2) did not deactivate the catalyst and was catalytically active towards SO2 oxidation, leading to the formation of H2SO4. Thus, the sulfur capacity of the V2O5/AC catalyst was determined by formation of V2O3(SO4)(2) and H2SO4. Increasing V2O5 loading enhanced the formation of V2O3(SO4)(2) but inhibited that of H2SO4 because V2O3(SO4)(2) occupied the pores for H2SO4 storage.