1. A Probe into the Low-Temperature SCR Activity: NO Oxidative Activation to Nitrite-Intermediates.
- Author
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Zhang, Yu, Dong, Yi, Zou, Renzhi, Zhou, Zhiying, Hu, Wenshuo, Ran, Mingchu, Song, Hao, Liu, Shaojun, Zheng, Chenghang, and Gao, Xiang
- Subjects
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NITRITES , *FOURIER transform infrared spectroscopy , *CATALYTIC reduction , *CATALYSTS , *CATALYSIS , *DESORPTION - Abstract
Investigation of the low-temperature (LT) selective catalytic reduction (SCR) of NOx has adsorbed extensive efforts, and is now a hot topic in environmental catalysis. In this work, we cautiously explore the mechanism beneath LT-SCR via a combination of chemical-trapping methods, using BaO/Al2O3 as a NOx-intermediate trap, temperature-programmed desorption (TPD) and in situ FTIR spectroscopy over a series of metal-oxide catalysts. Our results show a linear correlation between LT-SCR rates and amounts of nitrites generated from NO oxidative activation and sequentially stored on BaO/Al2O3, implying key roles of nitrites/nitrite-precursors in LT-SCR. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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