化工学报2017，Vol.68Issue(11)：4239-4248,10.DOI:10.11949/j.issn.0438-1157.20170504
燃煤电厂废旧SCR脱硝催化剂中TiO2载体的回收与再利用
Recycling and reuse of TiO2 carrier from waste SCR catalysts used in coal-fired power plants
摘要
Abstract
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.关键词
燃煤电厂/烟气脱硝/选择性催化还原/废弃催化剂/TiO2载体/再利用Key words
coal-fired power plant/flue gas denitration/selective catalytic reduction/waste catalyst/TiO2 carrier/reuse分类
资源环境引用本文复制引用
戚春萍,武文粉,王晨晔,李会泉..燃煤电厂废旧SCR脱硝催化剂中TiO2载体的回收与再利用[J].化工学报,2017,68(11):4239-4248,10.基金项目
国家自然科学基金项目(51574214). supported by the National Natural Science Foundation of China (51574214). （51574214）
