导向剂法合成低硅X型沸石(LSX)

Synthesis of Low-silica X-Zeolite via Crystallization Directing Agent Method

利用导向剂法 ( CDA)合成低硅 [n( Si O2 ) /n( Al2 O3 )≈ 2 .0 ]X型沸石 ,用 XRD,X射线荧光光谱测定样品的晶相及化学组成 ,并利用电子衍射对导向剂在老化过程中的结构变化进行了研究 .结果表明 ,导向剂法合成速度快、杂晶极少 .在晶化过程中的导向作用是一个持续过程 ,其活性不仅与配方、老化时间和温度有关 ,而且与其晶面的生长有关 .

Low-silica X-zeolite(LSX) with a molar ratio 2.0 of SiO 2 to Al 2O 3 has been prepared by crystallization directing agent(CDA). The crystal structure was studied by XRD. The composition and crystal phases were detected by X-ray fluorescence spectrum and electron diffraction spectrum. LSX was synthesized quickly with a high crystallization by using the CDA method. The directing effect of CDA was consecutive in the synthesis. The effect of CDA is related to the composition of mixture, aging time and temperature, and it is related to the growth of the crystal faces.