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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
Affiliation  

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-13HDP and Cu-SSZ-13@FexOy), respectively. Both of them maintained a NOx 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-13HDP, some active Fe species were maintained during SO2 poisoning, which increased the reactivity between NH3-adsorbed species and NOx in the presence of SO2. The characteristic contributed to its better SO2 tolerance. For Cu-SSZ-13@FexOy, 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 NOx 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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