QI Chunping, WU Wenfen, WANG Chenye, et al. Recycling and reuse of TiO2 carrier from waste SCR catalysts used in coal-fired power plants[J]. CIESC Journal, 2017, (11): 4239-4248. DOI: 10.11949/j.issn.0438-1157.20170504.
QI Chunping, WU Wenfen, WANG Chenye, et al. Recycling and reuse of TiO2 carrier from waste SCR catalysts used in coal-fired power plants[J]. CIESC Journal, 2017, (11): 4239-4248. DOI: 10.11949/j.issn.0438-1157.20170504.DOI:
The recycling and reuse of TiO2 carrier from waste SCR catalysts used in coal-fired power plants was studied. The influence of reaction time
temperature
liquid-to-solid ratio and NaOH concentration on the leaching efficiency of Al
Si
V
W and Ti during leaching process
specific surface area and pore volume of leaching residue was investigated. The optimal leaching conditions were obtained with reaction time of 180 min
temperature of 160℃
liquid-to-solid ratio of 15 ml·g-1 and NaOH concentration of 2.5 mol·L-1. The main composition of the leaching residue obtained under optimal conditions was anatase TiO2
which was then used to synthesize V2O5-WO3/TiO2 catalysts with various V2O5 loadings after acid washing. The activity evaluation revealed that the resynthesized 0.7% V2O5-WO3/TiO2 catalyst was almost recovered to the level of fresh catalyst with NO conversion being recovered to 97.8% at 300℃
and it also showed a good resistance to SO2 and H2O.