Due to the presence of SO₂ in flue gas, SCR catalysts with high SO₂ tolerance are desperately required. However, except vanadium-based catalysts, most metal oxide catalysts exhibit low SO₂ tolerance. In this research study, CuSO₄/TiO₂, Fe₂(SO₄)₃/TiO₂, MnSO₄/TiO₂, Ce(SO₄)₂/TiO₂ and CoSO₄/TiO₂ catalysts were prepared via a sol–gel protocol and used in the NH₃-SCR reaction. Low-temperature N₂-sorption, XRD, FT-IR, XPS, H₂-TPR, NH₃-TPD and in situ DRIFTS were used to characterize the physicochemical properties of the prepared catalysts. The presence of SO₂ had little influence on the activity of all metal sulfate catalyst samples. CuSO₄/TiO₂ showed the highest SCR activity and apparent activation energy among the metal sulfate catalysts following the sequence of CuSO₄/TiO₂ < Fe₂(SO₄)₃/TiO₂ < MnSO₄/TiO₂ < Ce(SO₄)₂/TiO₂ < CoSO₄/TiO₂. Characterization results indicated that the amount of acid sites was the main factor that influenced the catalytic activity of the metal sulfate catalysts. The NH₃-SCR reaction of all metal sulfate catalysts followed the Eley–Rideal mechanism: NH₃ was first adsorbed at the surface acid sites (Lewis and Brønsted acid sites), and then it reacted with gaseous NO and O₂ to form N₂ and H₂O. The metal sulfate catalysts, especially CuSO₄/TiO₂, should be a promising candidate for vanadium-based SCR catalysts for NO reduction.

中文翻译：

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通过溶胶-凝胶方案制备的TiO2负载的金属硫酸盐催化剂上的NH3选择性催化还原NOx

由于烟道气中存在SO ₂，迫切需要具有高SO ₂耐受性的SCR催化剂。但是，除了钒基催化剂外，大多数金属氧化物催化剂表现出低的SO ₂耐受性。在本研究中，通过溶胶-法制备了CuSO ₄ / TiO ₂，Fe ₂（SO ₄）₃ / TiO ₂，MnSO ₄ / TiO ₂，Ce（SO ₄）₂ / TiO ₂和CoSO ₄ / TiO ₂催化剂。凝胶协议，用于NH ₃-SCR反应。利用低温N ₂吸附，XRD，FT-IR，XPS，H ₂ -TPR，NH ₃ -TPD和原位DRIFTS表征了所制备催化剂的理化性质。SO ₂的存在对所有金属硫酸盐催化剂样品的活性影响很小。的CuSO ₄ /二氧化钛₂表明在金属硫酸盐的催化剂中的最高SCR活性和表观活化能的CuSO的序列以下₄ /二氧化钛₂ <铁₂（SO ₄）₃ /二氧化钛₂ <的MnSO ₄ /二氧化钛₂<Ce（SO ₄）₂ / TiO ₂ <CoSO ₄ / TiO ₂。表征结果表明，酸性部位的数量是影响金属硫酸盐催化剂催化活性的主要因素。所有金属硫酸盐催化剂的NH ₃ -SCR反应遵循Eley-Rideal机理：NH ₃首先被吸附在表面酸性位点（Lewis和Brønsted酸性位点），然后与气态NO和O ₂反应形成N _2。和H ₂ O的金属硫酸盐的催化剂，尤其是硫酸铜₄ /二氧化钛₂，应该是钒基SCR催化剂用于NO还原的有希望的候选者。