双金属片
催化作用
氧化还原
化学
选择性
无机化学
高分辨率透射电子显微镜
吸附
X射线光电子能谱
氮氧化物
选择性催化还原
氧化剂
化学工程
材料科学
物理化学
纳米技术
燃烧
有机化学
透射电子显微镜
工程类
作者
Qimin Zhou,Kailin He,Xiaoxiang Wang,Khak Ho Lim,Pingwei Liu,Wenjun Wang,Qingyue Wang
标识
DOI:10.1016/j.apcata.2022.118796
摘要
Low-temperature selective catalytic reduction with NH3 (LT-SCR) is a promising approach for NOx remediation. This work utilized bimetallic metal-organic frameworks (MOFs) to prepare CeMOx (M=Ti, Cu) catalysts allowing the homogeneous distribution of promoters to investigate LT-SCR explicitly. The strong interfacial interaction between nanoscale-mixed components was characterized on CeTiOx by HRTEM, micro-Raman, and XPS, resulting in high acidity and good redox properties with abundant Ce3+ and Ti4+. It obtained over 80% conversion from 180 °C to 300 °C with 100% N2 selectivity, and maintained stable performance in SO2/H2O at a high GHSV of 150,000 h−1. In situ DRIFTS reveals that NH3 adsorption was promoted on CeTiOx, which accelerated reaction between NOx and adsorbed NH3 via Eley-Rideal mechanism. Meanwhile, the aliovalent substitution of ceria by Cu2+ was observed on CeCuOx, forming oxygen vacancies. Its high redox properties enhanced NOx conversion by Langmuir-Hinshelwood mechanism, but triggered NH3 peroxidation, leading to poor N2 selectivity.
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