At present, commercial V₂O₅–WO₃(MoO₃)/TiO₂ catalyst for selective catalytic reduction with NH₃ (NH₃-SCR) shows poor resistance to alkali, alkaline-earth, and heavy metals that are normally contained in flue gas. The present work demonstrated a solid superacid FeSTi catalyst prepared using a thermal hydrolysis method that exhibited greatly improved resistance to poisoning by K, Ca, and Pb. This FeSTi catalyst provided high NO_x conversion (>90%) over a wide temperature range even after being doped with 1 wt % K₂O, 2 wt % CaO, or 5 wt % PbO. Characterizations of the catalysts indicated that the deposition of metal oxides did not affect the stability of their crystal structures or redox properties. K₂O, CaO, and PbO were evidently trapped by surface SO₄^2– ions on the catalyst to form K₂SO₄, CaSO₄, and PbSO_4. The FeSTi catalyst contained approximately 4.1 wt % S, and this high S content allowed the catalyst to retain superacid properties following metal oxide deposition, such that its catalytic activity was not significantly affected. In situ diffuse reflectance infrared Fourier transform spectroscopy data indicated that both the Eley–Rideal (E–R) and Langmuir–Hinshelwood reaction mechanisms simultaneously occurred over the catalyst. The deposition of oxide poisons did not change the reaction routes or mechanisms, although the reaction rate associated with the E–R mechanism was slowed.

中文翻译：

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FeSTi用于NH ₃ -SCR的超强酸催化剂，对烟气中的金属中毒具有优异的抗性

目前，用于以NH ₃（NH ₃ -SCR）选择性催化还原的商用V ₂ O ₅ -WO ₃（MoO ₃）/ TiO ₂催化剂对碱金属，碱土金属和重金属的耐受性较差。烟气。本工作证明了使用热水解方法制备的固体超强酸FeSTi催化剂，具有显着改善的抗K，Ca和Pb中毒能力。此FeSTi催化剂提供高的NO _X，即使掺杂有1重量％K后转化率（> 90％）在宽的温度范围₂O，2 wt％的CaO或5 wt％的PbO。催化剂的特性表明，金属氧化物的沉积不影响其晶体结构的稳定性或氧化还原性能。ķ ₂ O，CaO和的PbO均可被表面捕获的SO _4根^2-离子在催化剂上以形成ķ ₂ SO ₄，硫酸钙₄，和硫酸铅₄的FeSTi催化剂含有大约4.1重量％的S，并且该高S含量使催化剂在金属氧化物沉积后保留了超强酸性质，因此其催化活性没有受到明显影响。原位漫反射红外傅里叶变换光谱数据表明，Eley-Rideal（E-R）和Langmuir-Hinshelwood反应机理同时在催化剂上发生。氧化物毒物的沉积并没有改变反应途径或机理，尽管与E–R机制相关的反应速率减慢了。