柴油车尾气排放的NO_x（NO和NO₂）严重污染环境和危害人类的健康。SSZ-13分子筛由于具有较宽的脱硝温度窗口及优异的水热稳定性受到广泛关注。利用TiCl₄溶液对原位水热法合成的Cu-SSZ-13催化剂进行离子交换，并通过XRD、H₂-TPR、NH₃-TPD、氮吸附等对其进行表征，考察了离子交换浓度、时间及温度对催化剂催化性能的影响，并在此基础上优化最佳的交换条件。结果表明，随着钛负载量的增加，高温活性呈增强的趋势，并且经过高温水热处理后，钛可以在一定程度上保持催化剂的骨架结构。

NO_x(NO and NO₂) emitted by diesel vehicles pollutes the environment and endangers human health seriously.SSZ-13 molecular sieve catalysts have attracted extensive attention due to their wider denitrification temperature window and excellent hydrothermal stability.Ion exchange is carried out between Cu-SSZ-13 catalysts synthesized by in-situ hydrothermal method and TiCl₄ solutions.Based on the XRD,H₂-TPR,NH₃-TPD and physical adsorption characterization,the effects of the concentration,time and temperature of ion exchange on the properties of the catalysts are investigated and the exchange conditions are optimized.It is shown that the denitrification activity at high temperature tends to increase with the increase of titanium loading amount,and titanium can help the catalyst maintain skeleton structure after hydrothermal treatment at higher temperature.

刘梦梦(1992-),女,硕士研究生,研究方向为环境净化,liumengmengme@163.com