Titanium oxide (TiO2) with high specific surface area was prepared from blast furnace slag by steps

in succession

extraction using dilute sulfuric acid (#em/em#.e.

acidolysis)

hydrolysis and high-temperature calcination

and was used as the support in preparing V2O5-WO3/TiO2 catalyst for flue gas denitration by selective catalytic reduction (SCR). The prepared TiO2 support was characterized with XRD

XRF and BET

and the catalyst was evaluated in a laboratory fixed bed reactor for SCR of NO by NH3 including both activity and stability in simulated flue gas containing SO2 and H2O. The leaching rate of TiO2 could reach 90% under the optimized acidolysis conditions

#em/em#.e. sulfuric acid 40%(mass)

acid/slag ratio 1.5

leaching time 3 h and reaction temperature 80℃. The hydrolysate was mainly composed of 74%(mass) anatase TiO2

21.1%（mass） amorphous SiO2 and some other impurities. The presence of SiO2 significantly increased the specific surface area and pore volume of the TiO2 support

which was beneficial to disperse the loaded active catalytic components. The prepared V2O5- WO3/TiO2 catalyst with the TiO2 support from titanium-bearing blast furnace slag exhibited higher catalytic activity than the ones prepared from commercial TiO2 and TiOSO4 at temperatures of 250—450℃

while it presented also good resistance even at 300℃ to the negative effects of sulfur dioxide and water in flue gas.