Promotion Effect of Fe Species on SO2 Resistance of Cu-SSZ-13 Catalysts for NOx Reduction by NH3,Industrial & Engineering Chemistry Research

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Promotion Effect of Fe Species on SO2 Resistance of Cu-SSZ-13 Catalysts for NOx Reduction by NH3
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-06-16 , DOI: 10.1021/acs.iecr.2c00789
Lijuan Xie ₁ , Chang Liu ₁ , Yun Deng ₁ , Fudong Liu ₂ , Wenquan Ruan ₁

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In this study, homogeneous precipitation and self-assembly methods were used for the preparation of two kinds of Fe-containing Cu-SSZ-13 catalysts (CuFe-SSZ-13_HDP and Cu-SSZ-13@Fe_xO_y), respectively. Both of them maintained a NO_x conversion of ∼46% at 225 °C after poisoning with 100 ppm SO₂ at 400 000 h^–1. Fe species promoted the SO₂ resistance of Cu-SSZ-13 significantly. The structure–activity relationship and reaction mechanism were explored to explain the promotion effect in detail. For CuFe-SSZ-13_HDP, some active Fe species were maintained during SO₂ poisoning, which increased the reactivity between NH₃-adsorbed species and NO_x in the presence of SO₂. The characteristic contributed to its better SO₂ tolerance. For Cu-SSZ-13@Fe_xO_y, Fe species protected some Cu species from forming CuSO₄ and decreased the amount of ammonium sulfate on the catalyst surface due to their special distribution. Better NO_x activation after SO₂ poisoning was the most important reason for its better SO₂ tolerance.

中文翻译：

Fe 对 Cu-SSZ-13 NH3 还原 NOx 催化剂抗 SO2 的促进作用

本研究采用均相沉淀法和自组装法分别制备了两种含铁Cu-SSZ-13催化剂（CuFe-SSZ-13 _HDP和Cu-SSZ-13@Fe _x O _y） . 在 400 000 h ^{-1用 100 ppm SO}₂中毒后，它们都在 225 °C 下保持了约 46% 的 NO _x转化率。Fe物种显着促进了Cu-SSZ-13的SO ₂抗性。探讨了构效关系和反应机理，详细解释了促进作用。对于 CuFe-SSZ-13 _{HDP ，在 SO}₂中毒过程中保留了一些活性 Fe 物种，这增加了 NH 之间的反应性。_{SO 2}存在下的_3-吸附物质和NO _x。该特性有助于其更好的 SO ₂耐受性。对于Cu-SSZ-13@Fe _x O _y，Fe 物种保护了一些Cu 物种不形成CuSO ₄，并由于它们的特殊分布而减少了催化剂表面的硫酸铵量。_{SO 2}中毒后更好的NO _x活化是其更好的SO ₂耐受性的最重要原因。

更新日期：2022-06-16

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