The Mn‐Fe‐Sn/TiO₂(MFST) catalysts for NO and Hg co‐removal with SO₂ resistance at low temperature were prepared by the impregnation method under different calcination temperatures (300, 400, 500, and 600°C). The influences of calcination temperatures on SO₂ resistance and of SO₂ concentration on both denitration and demercuration performances of the Mn‐Fe‐Sn/TiO₂ catalysts were investigated in a fixed‐bed reaction system. Surface physicochemical characteristics and SO₂ resistance mechanism of MFST catalysts were analyzed by means of Brunauer–Emmett–Teller (BET), X‐ray diffraction (XRD), H₂‐temperature‐programmed reduction (H₂‐TPR), and X‐ray photoelectron spectroscopy (XPS). The results showed that the NO and Hg⁰ removal efficiency of the MFST catalysts was not affected by reaction temperature between 200–280°C in the absence of SO₂. However, the NO and Hg⁰ removal efficiency was affected mostly in SO₂‐containing atmosphere. Appropriate calcination temperature can alleviate SO₂ poisoning and improve catalytic activity. When the calcination temperature was below 500°C, MFST catalysts have good resistance to the SO₂, and it was found that at calcination temperature of 400°C, the NO and Hg⁰ removal efficiency had the minimum decay from 95% to 70% and 99% to 93% at 700 ppm SO₂, respectively, which was higher than that of other catalysts. That was mainly due to the abundant BET surface area and pore parameters and the high ratio of Mn⁴⁺/(Mn⁴⁺ + Mn³⁺), Fe³⁺/(Fe³⁺ + Fe²⁺), and O_α/(O_α + O_β) on catalyst surface. At lower calcination temperature (≤400°C), the metal active ingredient did not calcined sufficiently that made the NO and Hg⁰ removal efficiency declined. While at higher calcination temperature (>400°C), the catalyst tended to agglomeration and MnO₂ was converted into Mn₂O₃ gradually. Furthermore, doping Fe and Sn can effectively reduce the consumption of Mn⁴⁺, which greatly improved the catalytic activity and the SO₂ resistance.

中文翻译：

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低温下煅烧温度对Mn-Fe-Sn / TiO2催化剂抗SO2性能的影响

通过浸渍法在不同的煅烧温度（300、400、500和600°C）下制备了用于低温下以SO ₂耐性共脱除NO和Hg的Mn-Fe-Sn / TiO ₂（MFST）催化剂。在固定床反应系统中，研究了煅烧温度对SO ₂耐受性和SO ₂浓度对Mn-Fe-Sn / TiO ₂催化剂脱硝和脱汞性能的影响。MFST催化剂的表面理化特性和SO ₂抵抗机理通过Brunauer-Emmett-Teller（BET），X射线衍射（XRD），H _2程序升温还原（H ₂-TPR）和X射线光电子能谱（XPS）。结果表明，在没有SO ₂的情况下，反应温度在200–280℃之间不会影响MFST催化剂的NO和Hg ⁰去除效率。但是，NO和Hg ^0的去除效率主要在含SO ₂的气氛中受到影响。适当的煅烧温度可以减轻SO ₂中毒并提高催化活性。当煅烧温度低于500℃时，MFST催化剂对SO ₂具有良好的抵抗性，并且发现在煅烧温度为400℃时，NO和Hg ^0的去除效率从95％到70％具有最小的衰减。 SO在700 ppm时为99％至93％₂分别高于其他催化剂。这主要是由于大量的BET表面积和孔参数以及Mn ⁴⁺ /（Mn ⁴⁺ + Mn ³⁺），Fe ³⁺ /（Fe ³⁺ + Fe ²⁺）和_Oα / （_Oα + _Oβ）在催化剂表面。在较低的煅烧温度（≤400°C）下，金属活性成分未充分煅烧，导致NO和Hg ^0的去除效率下降。在较高的煅烧温度（> 400°C）下，催化剂趋于团聚，MnO ₂转化为Mn ₂ O₃逐渐。此外，掺杂Fe和Sn可以有效减少Mn ⁴⁺的消耗，从而大大提高了催化活性和抗SO _2的能力。