Fe/beta分子筛催化N2O分解

摘要

The modified Fe/beta zeolite was prepared by liquid ion exchange method of H-beta.The Fe/beta was used in the catalytic decomposition of N2O,in which the effect of the system pH after adding HNO3was studied.The structure and properties of the Fe/beta were characterized by N2-physical ad-sorption-desorption,XRD,IR,DR UV -Vis,NH3-TPD and ICP -OES.The results showed that the crystallinity,specific surface area,pore volume and Fe3+content of the catalysts increased first and then decreased during the process of solution pH reduced. The temperature of complete decomposition of Fe/beta zeolite prepared at the pH of 2.0 whose better catalytic activity was better was obviously lower than that of the catalysts prepared at the pH of 2.6 and 1.0.%通过液相离子交换法对H-beta分子筛进行改性得到Fe/beta分子筛,并应用于催化N2O直接分解反应,考察加入HNO3后的体系pH值对Fe/beta催化性能的影响.采用N2物理吸附-脱附、XRD、IR、DR UV-Vis、NH3-TPD和ICP-OES等对Fe/beta分子筛进行分析表征.结果表明,溶液pH值降低过程中催化剂的结晶度、比表面积、孔容及Fe3+含量呈现先增加后减少.溶液pH为2.0时所制备的Fe/beta分子筛催化N2O完全分解温度明显低于pH为2.6和1.0时制备的Fe/beta催化剂,显示了较好的催化活性.