FeCoY催化剂的催化还原脱硫脱硝性能

Catalytic Reduction Proerties of FeCoY Catalysts for Desulfurization and Denitrification

以CO为还原剂,FeCoY为活性组分,采用等体积浸渍法制备了一系列不同负载量、不同载体的催化剂FeCoY/AC,并在微型固定床反应器上探讨催化剂同时脱硫脱硝活性及抗氧化性。通过XRD、BET、H2-TPR对催化剂进行了表征。结果表明:经过硝酸预处理的催化剂能显著提高催化剂的性能;通过同时脱硫脱硝正交实验,得到活性组分Fe、Co、Y分别占载体质量10%、6%、3%的催化剂10Fe6Co3Y/AC为最优组合,脱硫脱硝转化率均能达100%,T90%(脱硫脱硝转化率同时达到90%时的温度)约为218℃。XRD结果表明:催化剂具有尖晶石结构。抗氧化性实验初步判断脱硫过程遵循Redox-COS协同作用机理,而脱硝仅遵循COS机理,体积分数为1%的O2对NO和SO2的活性位点表现出不同的毒害作用。

A series of catalysts with different loading amount and different supports were prepared by equal volume impregnation method using FeCoY as active component. Their simultaneous desulfurization and denitration activities and oxidation resistance were studied in an atmospheric pressure micro fixed bed reaction device using CO as reducing agent. The catalysts were characterized by XRD, BET and H2-TPR.The results show that pretreatment of activated carbon(AC) with nitric acid can improve the performance of the catalyst. The catalyst 10 Fe6Co3Y/AC(the active components Fe, Co and Y are 10%, 6% and 3% of the supports mass, respectively) is the best combination and the desulfurization and denitrification efficiencies can reach 100%. T90%(the temperature at which the desulfurization and denitrification efficiencies reach 90% simultaneously) is about 218 ℃. XRD results demonstrate that the catalyst has a spinel structure. From the results of oxidation resistance experiments, it is preliminarily judged that the desulfurization process follows the Redox-COS synergistic mechanism, while the denitration only follows the COS mechanism. Oxygen with a volume fraction of 1% exhibits different toxic effects on the active sites of NO and SO2.