低温水热合成ZSM-5/堇青石整体式催化剂

以蜂窝状堇青石为载体，采用原位水热合成法在120 ℃晶化温度下制备了ZSM-5/堇青石整体式催化剂。采用XRD、SEM对制备得到的整体式催化剂进行表征，并对整体式催化剂进行了牢固度测试以及NO催化氧化活性研究。结果表明，在120 ℃晶化温度下成功制备了15 μm厚负载量为25.8%的ZSM-5分子筛涂层；和传统的170 ℃的晶化温度相比，120 ℃晶化温度下制备的整体式催化剂上分子筛涂层的均匀性更好，牢固度更高。NO催化氧化结果表明，低温晶化下得到的整体式催化剂表现出良好的NO催化氧化效率。

LOW TEMPERATURE HYDROTHERMAL SYNTHESIS OF ZSM-5/CORDIERITE MONOLITH CATALYST

A low temperature hydrothermal synthesis method in situ at crystallization temperature 120 ℃ was used to prepare ZSM-5 zeolite coating on cordierite honeycomb ceramic support. The prepared monolith catalysts were characterized by means of X-ray diffractometer (XRD) and scanning electron microscopy (SEM). The firmness of the coating was tested by ultrasonic and thermal shock experiments and the NO oxidation activity of the monolith catalyst at room temperature was investigated. It is found that zeolite coatings with 15 μm thickness (loading 25.8% ZSM-5) are successful synthesized at crystallization temperature of 120 ℃ and that low synthesis temperature favors to the formation of homogeneous distribution of ZSM-5 zeolite on cordierite support. And the thermal shock tests indicate that zeolites coatings synthesized at 120 ℃ show a higher homogeneity and better firmness than that synthesized at 170 ℃. The monolith catalyst synthesized at 120 ℃ also show higher catalytic activity of NO oxidation compared with that synthesized at 170 ℃.