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由酸活化的高岭土制备了多级纳米孔HY分子筛.通过改变老化时间和晶化时间可得到最大的多级因子(HF),此时外比表面积最大而微孔孔体积变化不大.运用X射线衍射(XRD)、X射线荧光光谱、N2吸附-脱附法和NH3程序升温脱附对所得样品进行了表征.老化2d和晶化24h所制的纳米孔HY分子筛样品的HF值最大.样品的酸性和结晶度也随着制备条件而变化.另外,适量NaCl的嵌入对提高对所制样品的HF值、酸性和结晶度起到重要作用.通过比较样品和常规HY分子筛的XRD峰强度算得样品的结晶度.结果表明,优化合成条件可得到广泛适用于工业化的分子筛制备路线.
The multi-level nano-pore HY molecular sieve was prepared from acid-activated kaolin, and the maximum multi-stage factor (HF) was obtained by changing the aging time and crystallization time, in which case the external specific surface area was the largest and the volume of the micropore was little changed. XRD, X-ray fluorescence spectroscopy, N2 adsorption-desorption and NH3 temperature-programmed desorption were used to characterize the samples.The nano-porous HY molecular sieve prepared by aging 2d and crystallization 24h had the highest HF value.The samples The acidity and crystallinity also vary with the preparation conditions.In addition, the proper amount of NaCl intercalation plays an important role in improving the HF value, acidity and crystallinity of the prepared samples.Based on the XRD peak intensities of the comparative samples and conventional HY molecular sieves, The crystallinity of the sample.The results show that the optimized synthesis conditions can be widely used in industrial molecular sieve preparation route.