Reed flower-like SmMnO and cauliflower-like SmMnO-rGO catalysts were successfully synthesized by a coprecipitation-coupled solvothermal method for selective catalytic reduction (SCR) of NO. The NO conversion of the two catalysts is more than 90% in the temperature range of 75–200 °C, and the N selectivity of SmMnO-rGO is above 90%. Moreover, both of them exhibit more than 62% of resistance to HO and SO at a very low temperature of 100 °C, much superior than the fluffy spherical SmMnO prepared by coprecipitation method. The strong synergy between Mn and Sm endowed by the flower-like structure contributes to a low degree of crystallization, a high ratio of (Mn+Mn)/Mn, more chemisorbed oxygen species, strong redox ability, and more Lewis acid sites, hence effectively enhancing low-temperature SCR activity and resistance to HO and SO In addition, the decreased ratio of Mn/Mn after rGO doping hinders the side reaction of NH oxidation, thus enhancing the N selectivity of rGO-doped SmMnO catalyst.

中文翻译：

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花状 SmMnOx 和 SmMnOx-rGO 催化剂的增强低温选择性催化还原 (SCR) 活性以及 H2O 和 SO2 抗性

采用共沉淀耦合溶剂热法成功合成了芦苇花状 SmMnO 和菜花状 SmMnO-rGO 催化剂，用于选择性催化还原 (SCR) NO。两种催化剂在75~200℃温度范围内NO转化率均超过90%，SmMnO-rGO的N选择性均在90%以上。而且，它们在100℃的极低温度下都表现出超过62%的抗H2O和SO的性能，远优于共沉淀法制备的蓬松球形SmMnO。花状结构赋予Mn和Sm之间的强协同作用，导致结晶度低、(Mn+Mn)/Mn比高、化学吸附氧种类多、氧化还原能力强、路易斯酸位多，因此有效提高低温SCR活性以及对H2O和SO的抵抗力。此外，rGO掺杂后Mn/Mn比值的降低阻碍了NH氧化的副反应，从而提高了rGO掺杂SmMnO催化剂的N选择性。