CTAB辅助合成MIL-100(Fe)及其NO-CO催化性能

CTAB assisted synthesis of MIL-100(Fe)and its catalytic properties for NO-CO

在表面活性剂十六烷基三甲基溴化胺(CTAB)作用下,采用水热合成法制备了一系列铁基金属有机骨架MIL-100(Fe)_((xCTAB,x=1/4,1/6,1/12)),其中Fe^0、1,3,5-BTC、HNO_3、HF、H_2O摩尔比为1.0∶0.67∶0.6∶2.0∶277,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)、傅立叶红外光谱仪(LR)、显微激光拉曼光谱仪(Raman)对所制备的催化剂进行了表征,结果表明添加表面活性剂CTAB辅助合成的MIL-100(Fe)_((xCTAB,x=1/4,1/6,1/12))比未添加CTAB合成的MIL-100(Fe)具有更规整晶形、更大比表面积及更高分散度;CO-SCR催化性能测试结果表明,在200℃时,MIL-100(Fe)_((1/4CTAB))的催化活性比MIL-100(Fe)的提高将近40%;在220℃的抗硫稳定性测试中,MIL-100(Fe)_((1/4CTAB))在通入SO_2后,仍能保持88%左右的脱硝率,且在停止通入SO_2后,其脱硝率能恢复至接近原有水平。

A series of iron based metal organic frameworks MIL-100(Fe)(x CTAB,x=1/4,1/6,1/12)were prepared by hydrothermal synthesis under the action of surfactant cetyltrimethylammonium bromide(CTAB),with n(Fe)∶n(1,3,5-BTC)∶n(HNO 3)∶n(HF)∶n(H 2O)=1.0∶0.67∶0.6∶2.0∶277.The prepared catalysts were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),specific surface area analyzer(BET),Fourier transform infrared spectroscopy(LR)and microscopic laser Raman spectroscopy(Raman).The results showed that MIL-100(Fe)(x CTAB,x=1/4,1/6,1/12)synthesized by surfactant CTAB had more regular crystal shape,larger specific surface area and higher dispersion than those of MIL-100(Fe)synthesized without CTAB.The catalytic activity of CO-SCR showed that the catalytic activity of MIL-100(Fe)(1/4 CTAB)was nearly 40%higher than that of MIL-100(Fe)at 200℃.Moreover,in the sulfur resistance test at 220℃,the denitrification rate of MIL-100(Fe)(1/4CTAB)was still about 88%after SO 2 was introduced,and the denitrification rate could return to the original level after the SO 2 was stopped.