刘亭;王廷春;吴瑞青;沈伯雄;

• 1:中国石油化工股份有限公司青岛安全工程研究院
• 2:南开大学环境科学与工程学院

摘要(Abstract)：

低温NH3-SCR脱除NOx是一种有潜力的烟气脱硝技术。综述了低温NH3-SCR脱硝催化剂的研究现状,重点介绍了锰基催化剂、钒基催化剂,以及其他金属氧化物基催化剂的研究状况,阐述了制备方法、催化剂载体,以及以不同金属改性对催化剂脱硝活性的影响。其中具备高比表面积、良好非晶态结构的低温NH3-SCR催化剂都有良好的低温脱硝活性。以CeO2改性锰(MnOx)基催化剂为例,探讨了低温NH3-SCR脱硝催化剂的脱硝机理。反应气体(NH3、NO和O2)在催化剂表面的吸附在低温NH3-SCR脱除NOx中发挥了重要作用。CeO2改性锰基催化剂催化NH3-SCR反应过程中涉及ER机理和LH机理,并且NH2与气态NO发生反应生成亚硝胺(NH2NO),进一步分解为N2和H2O是关键步骤。就燃煤烟气中水蒸气(H2O)和SO2在低温条件下对低温NH3-SCR脱硝催化剂的失活机制进行了阐述。烟气中的水蒸气与反应气体的竞争性吸附能够导致催化剂脱硝活性的降低。水蒸气(H2O)和SO2共同存在对低温NH3-SCR催化剂脱硝活性的影响表现为两者共同作用。烟气中水和SO2存在时生成的硫酸盐沉积在催化剂表面,并导致催化剂失活。

关键词(KeyWords)： 环境工程学;低温NH3-SCR;脱硝机理;失活机制

Abstract:

Keywords:

基金项目(Foundation):

作者(Authors): 刘亭;王廷春;吴瑞青;沈伯雄;

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