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Reducing N2O Formation over CO-SCR Systems with CuCe Mixed Metal Oxides
ChemCatChem ( IF 3.8 ) Pub Date : 2021-03-26 , DOI: 10.1002/cctc.202100057
Ruobing Sun 1 , Feng Yu 2 , Yinji Wan 1 , Keke Pan 3 , Wenjian Li 1 , Huanhuan Zhao 1 , Jianming Dan 1 , Bin Dai 1
Affiliation  

In the CO-SCR reaction, reducing by-product N2O formation helps to convert more NO into clean N2, which has a great significance to environmental governance. In this study, the CuCe mixed metal oxides with different molar ratios of Cu to Ce were prepared, characterized and evaluated to study the effect on the products of NO reduction by CO. The experimental results showed that the CuCe-1 : 3 catalyst showed superior NO conversion with over 90 % N2 selectivity in the operating temperature window, and there were no amounts of N2O by-product at 50–200 °C. The higher oxygen vacancy concentration and appearance of (NO)2 dimer inhibited N2O formation at low temperature. Finally, the reaction paths for the CuCe catalysts generating different products (N2, N2O) were proposed in the CO-SCR reaction based on in-situ DRIFTS results.

中文翻译:

使用 CuCe 混合金属氧化物减少 CO-SCR 系统上 N2O 的形成

在CO-SCR反应中,减少副产物N 2 O的生成有助于将更多的NO转化为清洁的N 2,对环境治理具有重要意义。本研究制备、表征和评价了不同 Cu/Ce 摩尔比的 CuCe 混合金属氧化物对 CO 还原 NO 产物的影响。实验结果表明,CuCe-1:3 催化剂表现出优越的性能。 NO 转化率在操作温度窗口中具有超过 90% 的 N 2选择性,并且在 50–200 °C 下没有大量的 N 2 O 副产物。较高的氧空位浓度和 (NO) 2二聚体的出现抑制了 N 2O 在低温下形成。最后,基于原位DRIFTS结果提出了CO-SCR反应中CuCe催化剂生成不同产物(N 2、N 2 O)的反应路径。
更新日期:2021-03-26
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