Abstract:

Currently, selective catalytic reduction (SCR) denitrification technology is the most effective technique to control emissions of nitrogen oxides from coal-fired power plants and it is widely utilized. The SCR catalyst is the core of SCR denitrification technology, which often encounters inactivation problems. The amount of harmful inactivated SCR catalyst is increasing with the increase in operation time of these power plants. V₂O₅ is the main active ingredient in the deactivated catalyst, and needs to be recovered. Three reducible organic acids, citric acid, tartaric acid, and oxalic acid were chosen to create an optimal experiment for recovery V₂O₅ from deactivated catalyst, and X-ray fluorescence was used to analyse the recovery result. The results demonstrated that oxalic acid has high acidity and strong reducibility, which provides a stronger acid environment for recovery V₂O₅ in the experiment. The oxalic acid recycling method only to control the reaction conditions, and no agent is needed to assist the recovery process. The experiment processes of oxalic acid simplify recovery method and are cost-effective.

Key words: SCR, deactivation, catalyst, reducible organic acids oxalic acid, V₂O₅, recovery

摘要：

选择性催化还原法（SCR）是目前燃煤电站脱除氮氧化物最有效的方法之一。催化剂是SCR脱硝技术的核心物质，它的性能直接影响着SCR系统的整体脱销效果。随着运行时间的增加，具有危害性的失活催化剂的数量也与日俱增。五氧化二钒作为催化剂中的主要活性成分，有必要对其进行回收。选取柠檬酸、酒石酸和草酸3种还原性有机酸对废旧催化剂中的V₂O₅进行回收优选实验，并使用X射线荧光光谱仪（XRF）对催化剂样品进行回收效果分析。结果表明，酸性较强的草酸还原性也强，为回收V₂O₅提供了强酸环境，回收实验流程简化，不需要添加任何药剂辅助回收，经济高效。

关键词: SCR, 失活, 催化剂, 还原性有机酸草酸, V₂O₅, 回收