堇青石蜂窝陶瓷载体上ZSM-5及Anacime沸石的原位合成

In situ Synthesis of ZSM-5 and Anacime Zeolites on Cordierite Honeycomb Ceramics

采用水热合成法，在堇青石蜂窝陶瓷载体上原位合成了ＺＳＭ５ 沸石和Ａｎａｃｉｍｅ 沸石，并用ＸＲＤ和ＳＥＭ 等技术进行了表征． 结果表明，当改变合成条件时，在堇青石表面可分别生长出厚度为３０ ～４０ μｍ 的ＺＳＭ５ 沸石和厚度为３０ ～１８０ μｍ 的Ａｎａｃｉｍｅ 沸石． 随着凝胶中ＳｉＯ２／Ａｌ２Ｏ３ 比的增大和含水量的减少，在堇青石蜂窝陶瓷上生长的分子筛的量也增加．

ZSM 5 and Anacime zeolites were respectively synthesized on the surface of a monolithic ceramic substrate composed of cordierite by employing hydrothermal processing, and characterized by XRD and SEM techniques. The results show that ZSM 5 zeolite layer with a thickness of 30～40 μm and Anacime layer of 30～180 μm have been grown on the surface of cordierite, respectively. Synthetic conditions under which ZSM 5 layers were grown on the substrate were also investigated. It has been found that the amount of ZSM 5 zeolite grown on the substrate increases with the molar ratio of SiO 2/Al 2O 3, as well as the molar ratio of SiO 2/H 2O in the gel. Three types of templates, such as N butylamine, tripropylamine and a mixture of ethylenediamine and triethylamine were used to promote the formation of ZSM 5 layer on the cordierite substrate.