摘要
用不同碱改性固体废物瓦斯灰制备出一种能够脱除烟气中NO的催化剂.考察了浸渍浓度、固液比、超声时间等制备条件对瓦斯灰脱硝性能的影响,并对材料进行了 XRF、XRD、SEM、EDS-Mapping、FT-IR表征.结果表明,利用KOH改性的瓦斯灰脱硝性能最佳,在KOH浓度为2 mol/L、固液比为1∶2、超声时间为40 min的最佳制备条件下脱硝率约达100％.改性后,K成功负载在材料表面,瓦斯灰微观结构发生了变化,生成的新物质为NO的去除提供了更多活性位点.
Abstract
A catalyst for removing NO from flue gas is prepared by using different alkali-modified gas ash,a kind of solid waste,to achieve the goal of"treating wastes with wastes".The influences of the preparation conditions such as impregnation concentration,solid-to-liquid ratio and sonication time on the denitrification performance of the gas ash-derived are investigated,and the catalyst is characterized by means of XRF,XRD,SEM,EDS-Mapping and FT-IR.The results show that the gas ash modified with KOH shows the best denitrification performance,which can deliver a denitrification rate of about 100％under the best preparation conditions that KOH concentration is 2 mol·L-1,solid-liquid ratio is 1∶2,and sonication time is 40 min.After the modification,K has successfully been loaded on the material surface,the microstructure of gas ash has been changed,and the new substances generated provide more active sites for NO removal.
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