Hou Benhui, Du Yali, Liu Xuezhen, Ci Chao, Wu Xu, Xie Xianmei
College of Chemistry and Chemical Engineering, Taiyuan University of Technology Taiyuan 030024 PR China
College of Chemistry and Chemical Engineering, Jinzhong University Jinzhong 030619 PR China.
RSC Adv. 2019 Aug 6;9(42):24377-24385. doi: 10.1039/c9ra04578c. eCollection 2019 Aug 2.
A series of Ni Mn bimixed metal oxides (Ni Mn-LDO) were prepared calcining Ni Mn layered double hydroxides (Ni Mn-LDHs) precursors at 400 °C and applied as catalysts in the selective catalytic reduction (SCR) of NO with NH. The DeNO performance of catalysts was optimized by adjusting the Ni/Mn molar ratios of Ni Mn-LDO precursors, in which NiMn-LDO exhibited above 90% NO conversion and N selectivity at a temperature zone of 180-360 °C. Besides, NiMn-LDO possessed considerable SO & HO resistance and outstanding stability. Multiple characterization techniques were used to analyze the physicochemical properties of the catalysts. The analysis results indicated that all catalysts had the same active species NiMnO, while their particle sizes showed significant differences. Notably, the uniform distribution of active species particles in the NiMn-LDO catalyst provided the rich surface acidity and suitable redox ability which were the primary causes for its desirable DeNO property.
通过在400℃下煅烧镍锰层状双氢氧化物（Ni - Mn-LDHs）前驱体制备了一系列镍锰双金属氧化物（Ni - Mn-LDO），并将其用作以NH₃选择性催化还原（SCR）NO的催化剂。通过调整Ni - Mn-LDO前驱体的Ni/Mn摩尔比来优化催化剂的脱硝性能，其中NiMn-LDO在180 - 360℃的温度范围内表现出高于90%的NO转化率和N₂选择性。此外，NiMn-LDO具有相当的抗SO₂和H₂O能力以及出色的稳定性。采用多种表征技术分析了催化剂的物理化学性质。分析结果表明，所有催化剂具有相同的活性物种NiMnO，但它们的粒径存在显著差异。值得注意的是，NiMn-LDO催化剂中活性物种颗粒的均匀分布提供了丰富的表面酸性和合适的氧化还原能力，这是其具有理想脱硝性能的主要原因。
