【摘要】 我国钢铁行业典型工序烟气中NO_x控制是研究的焦点。选择性催化还原技术是工业烟气脱硝技术中最常用的烟气脱硝方法。为充分发挥含钒物料的利用价值，降低脱硝成本，本文以钢铁企业在生产过程中产生的含钒物料为原料，采用焙烧预处理和硫酸浸渍的方式改性，制备了一种用于选择性催化还原氮氧化物的新型催化剂。通过优化制备参数，获得高活性和高抗性的脱硝催化剂，并借助表征技术明晰其理化性质。根据催化活性测试结果，经焙烧改性后含钒物料催化活性相较于未改性者仅略有提高，而硫酸改性极大提高了催化剂的高温催化性能和抗水抗硫性。氧气在催化反应过程中起着重要作用，较低含量或较高含量都会产生负面影响。焙烧处理后活性物种主要由Fe₃O₄向α-Fe₂O₃转变，而硫酸改性对表面孔结构有增强作用，可以促进催化剂的活性提升，同时催化剂中形成的硫酸盐物种对于提高催化活性也起着至关重要的作用。更多还原

【Abstract】 NO_x control in flue gas in typical processes of China’s steel industry is the focus of research. Selective catalytic reduction technology is the most used flue gas denitration method in industrial flue gas denitration technology. To give full play to the utilization value of vanadium-containing materials and reduce the cost of denitrification, a new catalyst for selective catalytic reduction of nitrogen oxides was prepared by using vanadium-containing materials produced by iron and steel enterprises in the production process as raw materials, modified by roasting pretreatment and sulfuric acid impregnation. By optimizing the preparation parameters, highly active and resistant denitration catalysts were obtained, and their physicochemical properties were clarified with the help of characterization techniques. According to the results of catalytic activity test, the catalytic activity of vanadium-containing materials modified by roasting is only slightly improved compared with that of unmodified, while sulfuric acid modification greatly improves the catalytic performance of the catalyst at high temperature and the water and sulfur resistance of the catalyst. Oxygen plays an important role in catalyzing the reaction, and both lower and higher levels can have a negative effect. The active species mainly changed from Fe₃O₄ to α-Fe₂O₃ after roasting, and the modification of sulfuric acid had an enhanced effect on the surface pore structure, which could promote the activity of the catalyst, and the sulfate species formed in the catalyst also played a crucial role in improving the catalytic activity.更多还原