【摘要】 采用共沉淀法制备Ce-Fe-Mn-W/Ti催化剂，研究了非稀土元素Mn/W比对NH₃-SCR催化剂脱硝性能的影响，通过调节控制催化剂中Mn/W的物质的量比，探究Mn/W比对催化剂的脱硝效率、XRD物相、比表面积和孔结构、XPS表面元素含量与价态、表面酸性和还原性能的影响机制。结果表明，Mn/W比为2.8的催化剂具有较好的中低温活性，205～445℃内脱硝效率能够达到90%以上。Mn/W比不影响催化剂的XRD晶型结构。Mn含量较高有利于增大催化剂的比表面积和孔容，促进高价态Mn⁴⁺和Ce⁴⁺的形成，增大化学吸附氧含量，提高低温吸附活性和还原性能，有助于NH₃和NO的吸附和活化，从而提升脱硝催化性能。更多还原

【Abstract】 The Ce-Fe-Mn-W/Ti catalyst was prepared by the co-precipitation method,and the influence of Mn/W ratio on denitration performance of NH₃-SCR catalysts was investigated in this study. By adjusting and controlling Mn/W ratio in the catalyst,the influence of Mn/W ratio on the denitration efficiency,XRD phase,specific surface area and pore structure,XPS surface element content and valence,as well as the surface acidity and reduction performance of the catalyst were explored. The results showed that the catalyst with Mn/W = 2. 8 had better medium and low-temperature activity,and the denitration efficiency could reach over 90% within the temperature range of 205 ～ 445 ℃. The Mn/W ratio did not affect XRD crystal structure of the catalyst. A higher Mn content was beneficial for increasing the specific surface area and pore volume of the catalyst,promoting the formation of high-valent Mn^{4 +}and Ce^{4 +},increasing the chemisorbed oxygen content,improving the adsorption and activation ability at low temperature,and facilitating the adsorption and activation of NH₃ and NO,thereby the denitration catalytic performance was enhanced.更多还原