论文部分内容阅读
采用原位晶化法制备了整体式FAU分子筛,系统考察了合成体系的n(SiO_2)/n(Al_2O_3)、n(Na_2O)/n(SiO_2)、n(H_2O)/n(Na_2O)、晶化温度和时间对整体式FAU分子筛结晶度的影响规律。结果表明,在所考察的范围内,随着合成体系的n(SiO_2)/n(Al_2O_3)增加和n(Na_2O)/n(SiO_2)的减小,整体式FAU分子筛结晶度逐渐升高;随着n(H_2O)/n(Na_2O)的增大,整体式FAU分子筛结晶度呈现先升高后降低趋势。晶化温度从80℃逐渐增加至100℃时,整体式FAU分子筛结晶度也随之升高;初始产物结晶度较低(0~2h),然后随着晶化时间的延长急剧升高(2~7h),最后基本保持不变(>7h)。按照较优的合成体系配比和晶化条件合成出了高纯度、高结晶度的整体式FAU分子筛。
The monolithic FAU molecular sieve was prepared by in-situ crystallization. The effects of n (SiO 2) / n (Al 2 O 3), n (Na 2 O) / n (SiO 2), n (H 2 O) / n Influence of temperature and time on the crystallinity of monolithic FAU zeolite. The results show that the crystallinity of monolithic FAU zeolite gradually increases with the increase of n (SiO 2) / n (Al 2 O 3) and the decrease of Na (2O) / n (SiO 2) With the increase of n (H_2O) / n (Na_2O), the crystallinity of the monolithic FAU zeolite showed a trend of first increasing and then decreasing. When the crystallization temperature is gradually increased from 80 ℃ to 100 ℃, the crystallinity of monolithic FAU zeolite also increases. The crystallinity of the initial product is low (0 ~ 2h) and then increases sharply with the prolongation of crystallization time (2 ~ 7h), the last basically unchanged (> 7h). According to the optimal synthesis ratio and crystallization conditions, a high purity and high crystallinity monolithic FAU zeolite was synthesized.