表面活化沸石外比表面积的试验研究

An Experimental Investigation on External Surface Area of Surfactant-modified Zeolite

利用阳离子表面活化剂(HDTMA Cl)对天然沸石进行了表面活化改性,并使用BET法测定了表面活化沸石颗粒(SMZ)和天然沸石颗粒的外比表面积,试验结果表明,粒径为4～100目时,天然沸石的比表面积为13.44～14.32m2/g,活化沸石的比表面积为4.18～6.79m2/g,与天然沸石相比较,其值要小1～2倍。通过轻拍式原子力显微镜镜像分析(TMAFM),探讨了SMZ外比表面积发生变化的原因。

The external surface area of raw zeolite and surfactant-modified zeolite (SMZ) was measured using BET method. The experimental results showed that the external surface area of raw zeolite at 4～6 mesh, 8～14 mesh, 14～40 mesh and 80～100 mesh was 13.82 m^2/g, 13.44 m^2/g, 14.28 m^2/g and 14.32 m^2/g respectively. While for the SMZ, the external surface area was significantly lower than that of the raw zeolite, was 6.79 m^2/g, 5.88 m^2/g, 5.57 m^2/g, 4.18 m^2/g respectively. The surface character of raw zeolite and SMZ were examined with tapping-mode atomic force microscopy (TMAFM). TMAFM images showed that the surfactant resulted in the decreasing of the surface area of the SMZ.