以焙烧高岭土为原料合成ZSM-5分子筛

以焙烧高岭土为原料，采用水热法合成ZSM-5分子筛，考察了晶化温度、晶化时间、模板剂用量以及投料硅铝比等因素对分子筛合成的影响，得出了最佳的合成条件：晶化温度为140～160℃，晶化时间为24h， n(TPAOH)/n(SiO2)=0.10，投料硅铝比为15:1。采用XRD，SEM，N2 吸附脱附等手段对最佳条件下所合成的样品进行表征，结果表明，以焙烧高岭土为原料可以合成出结晶度相对较高、微孔分布集中于0.56 nm、晶粒大小约2μm的小颗粒ZSM-5分子筛。

SYNTHESIS OF ZSM-5 ZEOLITE FROM CALCINED, KAOLIN

ZSM-5 zeolite was synthesized with calcined kaolin by hydrothermal crystallization method. The effects of crystallization temperature, crystallization time, amount of template and starting ratio of silica to alumina were investigated and the optimum parameters were obtained. The zeolite sample synthesized under the optimum conditions of a crystallization temperature in the range of 140～160℃, a crystallization time of 24h, n(TPAOH)/n(SiO2)=0.10 and a starting silica to alumina ratio of 15 were characterized by XRD, SEM and N2 adsorption and desorption. The results showed that fine ZSM-5 zeolite (with particle diameter of 2 micron) was obtained from calcined kaolin with relative high crystallinity and its micropore size was concentrated at about 0.56 nm.