Ni掺杂型OMS-2低温抗硫脱硝性能研究

使用前掺杂法,在水热合成OMS-2分子筛的过程中进行不同比例的Ni元素掺杂,成功制备出了一种能够在100℃,含SO2烟气中脱硝率达到95%以上的分子筛催化剂;并且利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、比表面积分析仪(BET)、X射线光电子能谱分析(XPS)对所制备的催化剂进行了表征,结果表明掺杂Ni物种在催化剂中主要以金属原子的形式分散在OMS-2中,主要取代OMS-2中的K+位,少量取代Mn4+位,并且使得OMS-2微观的一维管状结构变得细短,提高了OMS-2的比表面积和介孔数量,相比较于未掺杂的OMS-2,Ni(0.2)-OMS-2在无硫环境下脱硝率从50℃的86%上升到了98%,在含硫环境下仍能保持92%的脱硝率。

Low-temperature and anti-sulfur catalytic performance of Ni_x-OMS-2 for NO-CO

In this paper, different proportions of Ni elements were doped in the base of hydrothermal synthesis OMS-2 by pre-incorporation(QI). The Ni(x)-OMS-2 could be used in the flue gas contained SO2 and the denitration rate reached more than 95% under the temperature of 100 ℃. Ni(x)-OMS-2 was characterized by SEM, XRD, BET and XPS, and detected by the gas analyzer. Among the OMS-2 catalysts, Ni species was mainly in the form of metal atoms dispersed in OMS-2 in the catalyst, mainly replacing the K+ bit in OMS-2 and a small amount of the Mn4+ bit, and making the OMS-2 micro short tubular structure become thin, which improved the surface area and the number of mesoporous. Compared with OMS-2 without doping, the denitration rate of Ni(0.2)-OMS-2 rose to 98% from 86% at 50 ℃, and could still keep a denitration rate of 92% in SO2 environment.