采用低温老化、高温晶化的两步水热法合成出了LSX分子筛,系统考察了老化温度、老化时间以及晶化温度、晶化时间等因素对LSX分子筛合成的影响,得出了最佳的合成条件.采用XRD、化学分析以及N_2 吸附脱附等手段对最佳实验条件下所合成样品进行了表征.研究结果表明:所合成的LSX分子筛样品硅铝比低,纯度高,比表面积达503 m~2·g~(-1),微孔分布集中.
Low-silica X zeolite (LSX) was synthesized by two-step hydrothermal process with low temperature aging and high temperature crystallization period. The effects of aging temperature, aging time, crystallization temperature and crystallization time were investigated, then the optimal synthesis conditions were obtained. The synthesized sample at optimized conditions was characterized by X-ray diffraction, chemical analysis and N_2 adsorption and desorption. The results showed that the LSX with high puring had low SiO_2/Al_2O_3 ratio and high purity. Its specific surface area reached 503 m~2·g~(-1) and the micropore size distribution curve spread in a narrow range.
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