The performance of a commercial NH₃-SCR catalyst used for 20,000 h in a 660 MW coal fired power plant was evaluated after treated in situ with water vapor at 300–350 °C for 336 h. The conversion of NO_x reached 91.4% after this water treatment. The recovery of catalytic activity is mainly due to the removal of potassium, arsenic and sulfate-containing deposits from the catalyst surface, as well as the increase of surface active oxygen species and specific surface area. These results indicate that commercial NH₃-SCR catalysts are deactivated by the deposition of water-soluble substances and which can be in situ regenerated cost-effectively with high-temperature water vapor treatment.

在660 MW的燃煤电厂中，使用NH ₃ -SCR商用催化剂20,000小时后，在300-350°C的水蒸气中原位处理336 h后，对其性能进行了评估。在该水处理之后，NO _x的转化率达到91.4％。催化活性的恢复主要归因于从催化剂表面去除了钾，砷和硫酸盐的沉积物，以及表面活性氧种类和比表面积的增加。这些结果表明，商业NH ₃ -SCR催化剂通过水溶性物质的沉积而失活，并且可以通过高温水蒸气处理以成本有效的方式原位再生。