摘要
以硅溶胶为硅源、铝酸钠为铝源,在不同条件下,采用水热合成法直接合成系列Cu-ZSM-5催化剂,用模拟烟气考察其催化分解NO的活性,并对烟气脱硝的工况条件及催化剂的稳定性进行考察。实验结果表明：当硅铝比为60、硅铜比为17、pH为10-12时,合成的催化剂催化分解NO效果最佳,且催化剂的耐温性较好、对原料的适应范围较广,在烟气中O2体积分数为5%、NO质量分数为580-680μg？g、体积空速为18 000h^-1、反应温度为325-425℃的条件下,NO的去除率均可到达50%以上,最高去除率可达到61%;催化剂具有较好的活性稳定性,在反应温度325-425℃、运转时间40h内,催化剂均能保持较高的脱硝活性,且375℃下催化剂的稳定性最佳。
A series of Cu-ZSM-5catalysts were synthesized by hydrothermal synthesis method using silica sol as silica source and sodium aluminate as aluminum source under different synthesis conditions.The simulated flue gas was used to exams the catalyst activity of NO direct decomposition,de-NOxconditions as well as the activity stability of the catalyst.The results find that the best catalyst performance is achieved at the synthesis conditions of silica/alumina ratio of 60,silicon/copper ratio of 17 and pH of10—12.The catalyst prepared shows the best thermal tolerance and feed flexibility.The optimum working conditions for de-NOxof simulated flue gas with 580—680μg/g of NO are：gas space velocity of18 000h^-1 with O2 volume fraction of 5% and reaction temperature of 325—425 ℃.Under the above conditions,the removal rate of NO reaches more than 50% and the highest removal rate can reach 61%within 40 hoperation.The activity stability of the catalyst is the best at 375 ℃.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2015年第3期43-47,共5页
Petroleum Processing and Petrochemicals
关键词
分子筛
合成条件
模拟烟气
去除率
molecular sieve
synthesis condition
simulated flue gas
removal rate
