中文摘要：

使用离子交换法制备得到金属改性ZSM-5催化剂,并对其进行了一系列的表征,包括：傅里叶变换红外光谱（FT-IR）,氨气程序升温脱附（NH3-TPD）,原位漫反射红外光谱分析（In situ DRIFTS）.FT-IR实验说明金属的掺杂并未对ZSM-5的结构造成破坏.DRIFTS实验证实,金属改性ZSM-5催化剂低温下的SCR反应主要遵循Langmuir-Hinshelwood机理,即活化的NOx物种和活化的NH3物种进行反应.与Cu/ZSM-5催化剂相比,CuCe0.75Zr0.25Oy/ZSM-5催化剂可以加速氧化NO成为NO2,使得CuCexZr1-xOy/ZSM-5催化剂更容易生成—NO2物种,这对去除NOx催化的低温活性有很大的帮助.催化剂表面上的大部分硝酸盐和亚硝酸盐物种都是活性物种,但连二亚硝酸盐是个例外.

英文摘要：

Metal modified ZSM-5 catalysts were prepared by the ion exchange method and were characterized by Fourier transform infrared spectroscopy（FT-IR）,temperature-programmed desorption of ammonia（NH3-TPD）,and in situ diffuser reflection infrared Fourier transform spectroscopy（in situ DRIFTS）. FT-IR experiment shows that the structure of ZSM-5 was not damaged. The selective catalytic reduction（SCR） reaction over metal modified ZSM-5 catalysts mainly followed the Langmuir-Hinshelwood mechanism;i. e.,reaction of activated NOx species with activated NH3 species. Compared with Cu/ZSM-5 catalyst,the CuCe0.75Zr0.25Oy/ZSM-5 catalyst caused the amount of —NO2 species to increase after NO＋O2 adsorption,resulting in the temperature range for optimum NOx reduction（95%）extending to lower temperature. Most nitrate and nitrite species on the surface of catalysts are active intermediate species and the hyponitrites nitrate is an exception.