A novel method of microwave heating mixed liquid-assisted regeneration of V2O5–WO3/TiO2 commercial SCR catalysts
A novel method of microwave heating mixed liquid-assisted regeneration of V2O5–WO3/TiO2 commercial SCR catalysts
复制标题
DOI：
10.1007/s10653-014-9663-y
复制
发表时间：
2015-03
影响因子：
4.2
通讯作者：
K. Qiu;Jin Song;Hao Song;Xiang Gao;Zhong-yang Luo;K. Cen
中科院分区：
文献类型：
--
作者：
K. Qiu;Jin Song;Hao Song;Xiang Gao;Zhong-yang Luo;K. Cen
采用微波辅助乙醇与水混合液清洗、浸渍、干燥3步的方法对失活SCR催化剂进行再生实验研究。再生处理后，320℃下NO转化率从39%提高到90%，钒含量提高62.2%，远高于传统方法再生的结果。钒的浸渍量越多，是因为催化剂通道内混合液体的快速蒸发，在催化剂上产生更多的孔，从而导致表面积扩大。同时，随着乙醇浓度的增加，混合液的升温速率增大，混合液完全蒸发后的体积逐渐减小。由于较高的加热速率和液体蒸发后较大的体积有助于产生更多的孔，因此，当乙醇/混合溶液的体积比为20%时，催化剂获得最大比表面积，显着增加至约10%。与失活的催化剂相比，提高了 123%。此外，微波干燥的催化剂比传统烘箱干燥的催化剂表现出更好的催化活性。因此，该方法在工业应用中显示出巨大的潜力。
An experimental study on the regeneration of deactivated SCR catalysts was carried out using a microwave-assisted method containing three steps of washing with mixed liquid of ethanol and water, impregnating, and drying. After the regeneration treatment, NO conversion at 320 °C increased from 39 to 90 % and vanadium content increased by 62.2 %, which were much higher than those regenerated by the traditional method. The more impregnated vanadium was due to the fact that the rapid evaporation of mixed liquid inside the catalyst channels led to the enlargement of surface areas by creating more pores on the catalysts. Meanwhile, with the increasing concentrations of ethanol, the heating rate of the mixed liquid increased, and the volume after complete evaporation of the mixed liquid was gradually reduced. Since higher heating rate and lager volume after the liquid evaporation could help to create more pores, therefore, when the volume ratio of ethanol/mixed solution was 20 %, the catalyst obtained the maximum specific surface area, which significantly increased to ca. 123 % compared with the deactivated catalyst. In addition, the catalyst dried by microwave exhibited better catalytic activity than that dried in conventional oven. Therefore, this method showed great potential in industrial applications.