期刊
CHEMICAL ENGINEERING JOURNAL
卷 399, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.125798
关键词
Birnessite; Surface active groups; SO2 resistance; Low-temperature NH3-SCR
资金
- Sichuan Provincial Science and Technology Agency Support Projects [2018GZ0414]
- Chengdu Science and Technology Bureau Projects [2019-YF09-00079-SN]
Understanding the SO2 poisoning mechanism of catalysts and improving their SO2 resistance are the key to the technology of selective catalytic reduction of NO with NH3 (NH3-SCR). Birnessite catalysts were synthesized and used to investigate the SO2 poisoning effects in low-temperature NH3-SCR. Physicochemical characterizations indicated that surface active groups play a vital role in the poisoning process. Hydroxyl groups (OH) could react with SO2 to form HSO3-, and further react with NH3 to form NH4HSO3. The accumulation of excessive surface active oxygen groups (O-2(-)/O-2(2-)) could produce an oxygen inhibitory effect. The sample obtained using Mn (NO3)(2)center dot 4H(2)O as a precursor, having the least OH groups, exhibited the best catalytic activity (T-90 = 83 degrees C) and excellent SO2 resistance (T-90 = 129 degrees C). This work demonstrated the significant effect of surface active groups on SO2 resistance over birnessite, providing a new perspective for other catalysts to improve SO2 resistance.
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