催化作用
煅烧
傅里叶变换红外光谱
化学
扫描电子显微镜
核化学
分析化学(期刊)
程序升温还原
尿素
红外光谱学
材料科学
无机化学
化学工程
有机化学
工程类
复合材料
作者
Songjin Ko,Xiaolong Tang,Feifei Gao,You Zhou,Runcao Zhang,Yuanyuan Liu,Hengheng Liu
摘要
Abstract BACKGROUND In this study, a new catalyst for low‐temperature selective catalytic reduction of NO x with NH 3 (NH 3 ‐SCR) were prepared by using glucose and discussed optimization of the synthetic conditions of Mn x Co 3−x O 4 /GC (glucose carbon) catalysts by using the design of the experiments. A response surface methodology (RSM) combined with the central composite design (CCD) was applied to model and optimize the synthetic conditions. RESULTS As a result, the optimum NO x conversion of 95.6% and N 2 selectivity of 81.8% were obtained at Mn/Co 2.1, urea/(Mn + Co) mole ratio 11.5, glucose/(Mn + Co) mole ratio 8.9, preparation temperature 175.4 , and calcination temperature 376.3 . The SEM (Scanning electron microscope) image and EDS (Energy Dispersive Spectroscopy) analysis showed that metal oxides of Mn and Co were uniformly accumulated on the carbon microsphere surface. XRD (X‐ray diffraction) patterns showed that CoCo 2 O 4 content in the catalyst increased with the increase of the glucose/(Mn + Co) mole ratio, which reduced the interaction between Mn and Co, and played a negative impact on catalytic performance. FTIR (Fourier‐transform infrared) spectra showed that the catalyst surface in the optimum preparation conditions had more oxygen‐containing functional groups and that the excessive glucose carbon was unfavourable to catalytic performance. For urea/(Mn + Co), as urea/(Mn + Co) decreased, in addition to the decrease in Mn and Co content in the catalyst due to the decrease in precipitant, CoCo 2 O 4 content in the catalyst also increased and oxygen‐containing functional groups decreased, both of which resulted in the decrease of the catalytic performance. CONCLUSION The H 2 ‐TPR and NH 3 ‐TPD results demonstrated that the catalyst prepared in the optimum conditions possessed a stronger reducing ability, more acid sites, and stronger acid strength than the other. © 2021 Society of Chemical Industry
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