Experimental study of low-temperature flue gas denitrification based on H2O2 decomposition attapulgite catalyst

doi:10.16085/j.issn.1000-6613.2017-1526

Abstract

Abstract: The experiments of simulated coal-fired flue gas denitrification were carried out on the self-designed fixed-bed bench with attapulgite as catalyst. The effects of H₂O₂ concentration,H₂O₂ vaporization temperature,catalytic reaction temperature and catalytic reaction time on catalyst performance in denitrification experiment were investigated. The liquid phase composition after catalytic oxidation was analyzed. The surface structural properties of attapulgite catalyst at different reaction times were characterized by X-ray fluorescence(XRF),X-ray diffraction(XRD),Fourier transform infrared(FTIR) and Brunner-Emmet-Teller (BET) measurements. Denitrification results indicated that the NO removal efficiency is 70% when the concentration of H₂O₂ solution was 4mol/L and the flow rate was 5mL/h. The NO removal efficiency firstly increased and then decreased with the increase of catalytic reaction temperature,increased with the increase of H₂O₂ concentration and H₂O₂ vaporization temperature. Ion chromatographic(IC) analysis showed that the liquid phase composition is mainly nitric acid after NO is oxidized. Combined with the above experimental results,the oxidation of·OH is the main removal mechanism of NO. The characterization results showed that the structure,composition and pore structure parameters of attapulgite catalyst remain unchanged at different reaction times. During a reaction time of 4 hours,the NO removal efficiency remained constant,which is consistent with the results of the catalyst characterization,indicating that the attapulgite catalyst has good stability.

Key words: attapulgite clay, hydrogen peroxide, catalytic decomposition, low temperature flue gas denitrification

摘要： 采用凹凸棒土为催化剂，在自主设计的固定床实验台上进行模拟燃煤烟气脱硝实验研究。考察了H₂O₂浓度、H₂O₂汽化温度、催化反应温度以及催化反应时间对催化脱硝性能的影响，分析了催化氧化反应后的液相成分。通过X射线荧光光谱（XRF）、X射线衍射（XRD）、傅里叶变换红外（FTIR）光谱、BET比表面积测定等分析方法对不同反应时间凹凸棒土催化剂的理化结构特性进行表征。脱硝实验结果表明，在H₂O₂溶液浓度为4mol/L、流量为5mL/h条件下，NO脱除效率达到70%，NO脱除效率随着催化反应温度的升高先升高后降低，随H₂O₂浓度和H₂O₂汽化温度的增加而升高。离子色谱（IC）分析结果说明，NO被氧化后得到的液相成分主要为硝酸。结合上述实验结果可知，·OH氧化NO是脱除烟气中NO的主要作用机制。表征结果表明：不同反应时间下凹凸棒土催化剂的结构、成分、孔结构参数等基本保持不变。在4h反应时间内，NO脱除效率基本保持不变，这与催化剂表征结果相一致，说明凹凸棒土作为催化剂具有良好稳定性。

关键词: 凹凸棒土, 双氧水, 催化分解, 低温烟气脱硝

CLC Number:

X511

GAI Yangyang, WU Bo, XIONG Yuanquan. Experimental study of low-temperature flue gas denitrification based on H₂O₂ decomposition attapulgite catalyst[J]. Chemical Industry and Engineering Progress, 2018, 37(04): 1608-1615.

盖洋洋, 吴波, 熊源泉. 基于凹凸棒土催化双氧水分解的低温燃煤烟气脱硝[J]. 化工进展, 2018, 37(04): 1608-1615.

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Experimental study of low-temperature flue gas denitrification based on H₂O₂ decomposition attapulgite catalyst

基于凹凸棒土催化双氧水分解的低温燃煤烟气脱硝

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