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采用共沉淀法制备铁钨复合氧化物催化剂,用于NH3选择性催化还原NO,考察了Fe/W物质的量之比、反应空速、SO2和H2O对催化剂脱硝活性的影响,同时运用SEM、XRD、BET、NH3-TPD等表征手段对催化剂的微观形貌、晶型、比表面积、孔结构参数及表面酸性进行了分析。实验结果表明当n(Fe)∶n(W)=4∶1时,催化剂的反应活性最佳,其在300~400℃温度范围内及GHSV=75 000 h-1条件下NO转化率仍保持在90%以上,同时其也显示出较强的抗SO2和H2O中毒性能。通过表征发现Fe与W之间强烈的相互作用,较大的比表面积和催化剂较强的酸性是催化剂催化活性较好的主要原因。
The coprecipitation method was used to prepare the iron-tungsten composite oxide catalyst for the selective catalytic reduction of NO by NH3. The effects of Fe / W ratio, reaction space velocity, SO2 and H2O on the denitrification activity of the catalyst were investigated. SEM, XRD, BET, NH3-TPD and other characterization methods were used to analyze the morphology, crystal form, specific surface area, pore structure parameters and surface acidity of the catalyst. The experimental results show that the catalyst has the best reactivity when n (Fe): n (W) = 4:1, and the NO conversion remains at 300-400 ℃ and GHSV = 75 000 h-1 At more than 90%, it also shows strong resistance to SO2 and H2O poisoning. The strong interaction between Fe and W, the large specific surface area and the strong acidity of the catalyst were found to be the main reasons for the better catalytic activity of the catalyst.