KMS Chongqing Institute of Green and Intelligent Technology, CAS
| dopingeffectofcationszr4al3andsi4onmnoxceo2nanorodcatalystfornh3scrreactionatlowtemperature | |
Yao Xiaojiang1 ; Cao Jun1; Chen Li1; Kang Keke1; Chen Yang1; Tian Mi1; Yang Fumo2
| |
| 2019 | |
| 摘要 | Thermally stable Zr~(4+), Al~(3+), and Si~(4+) cations were incorporated into the lattice of CeO_2 nano‐rods (i.e., CeO_2‐NR) in order to improve the specific surface area. The undoped and Zr~(4+), Al~(3+), and Si~(4+) doped nano‐rods were used as supports to prepare MnO_x/CeO_2‐NR, MnO_x/CZ‐NR, MnO_x/CA‐NR, and MnO_x/CS‐NR catalysts, respectively. The prepared supports and catalysts were comprehensively characterized by transmission electron microscopy (TEM), high‐resolution TEM, X‐ray diffraction, Raman and N2‐physisorption analyses, hydrogen temperature‐programmed reduction, ammonia temperature‐programmed desorption, in situ diffuse reflectance infrared Fourier‐transform spectroscopic analysis of the NH3 adsorption, and X‐ray photoelectron spectroscopy. Moreover, the catalytic performance and H_2O+SO_2 tolerance of these samples were evaluated through NH3‐selective catalytic reduction (NH3‐SCR) in the absence or presence of H_2O and SO_2. The obtained results show that the MnO_x/CS‐NR catalyst exhibits the highest NOx conversion and the lowest N2O concentration, which result from the largest number of oxygen vacancies and acid sites, the highest Mn~(4+) content, and the lowest redox ability. The MnO_x/CS‐NR catalyst also presents excellent resistance to H_2O and SO_2. All of these phenomena suggest that Si~(4+) is the optimal dopant for the MnO_x/CeO_2‐NR catalyst. |
| 发表期刊 | 催化学报
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| ISSN | 0253-9837 |
| 卷号 | 40期号:5页码:733 |
| 语种 | 英语 |
