Simultaneous Fast Decomposition of NH4HSO4 and Efficient NOx Removal by NO2 Addition: An Option for NOx Removal in H2O/SO2-Contained Flue Gas at a Low Temperature
Simultaneous Fast Decomposition of NH4HSO4 and Efficient NOx Removal by NO2 Addition: An Option for NOx Removal in H2O/SO2-Contained Flue Gas at a Low Temperature
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同时快速分解 NH4HSO4 并通过添加 NO2 高效去除 NOx：低温去除含 H2O/SO2 烟气中 NOx 的一种选择
DOI：
10.1021/acs.energyfuels.8b01455
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发表时间：
2018
期刊：
影响因子：
5.3
通讯作者：
Ran Jingyu
中科院分区：
文献类型：
--
作者：
Wang Xiangmin;Du Xuesen;Zhang Li;Yang Guangpeng;Chen Yanrong;Ran Jingyu
NH4HSO4在催化剂表面的沉积是低温稳定脱除含NOXSO2烟气的主要障碍。本文首次研究了NO_2对NH_4HSO_4分解的促进作用。NH3选择性催化还原(SCR)实验表明，在250℃时，当烟气中存在NO2时，V2O5-WO3/TiO2催化剂具有较高的SCR活性和良好的抗SO2和H2O性能。Brunauer-Emmett-Teller、扫描电子显微镜和傅立叶变换红外光谱表征结果表明，NH4HSO4不会过度沉积在催化剂表面，因为NH4HSO4中的氨离子会被NO2/NO混合物迅速消耗。研究表明，通过适当调整NO2/NO比，可以在较低的温度下稳定高效地脱除含SO2烟气中的NOx。
The deposition of NH4HSO4on the catalyst surface is the main obstacle to the stable removal of NOxin SO2-contained flue gas at a low temperature. In this work, the promotional effect of NO2on the decomposition of NH4HSO4is presented for the first time. The NH3-selective catalytic reduction (SCR) experiments show that the V2O5–WO3/TiO2catalyst exhibits higher SCR activity and excellent resistance to SO2and H2O when NO2is present in the flue gas at 250 °C. Results from Brunauer–Emmett–Teller, scanning electron microscopy, and Fourier transform infrared spectroscopy characterizations indicate that NH4HSO4will not excessively deposit on the surface of the catalyst because the ammonia ion of NH4HSO4will be rapidly consumed by the NO2/NO mixture. Our study reveals that it is promising to stably and efficiently remove NOxfrom SO2-contained flue gas at a low temperature by properly adjusting the NO2/NO ratio.