文献类型：期刊文献

中文题名：沸石分子筛材料中次级孔的研究——Ⅰ.晶粒内次级孔与晶粒当量直径

英文题名：Study on Secondary Pore in Zeolite Molecular Sieve Materials Ⅰ. Secondary Pore in Crystalline Particle and Equivalent Diameter of Crystalline Particle

作者：陈绍洲[1];常可怡[1];柏子龙[1]

机构：[1]华东化工学院石油加工研究所

年份：1990

卷号：16

期号：6

起止页码：611

中文期刊名：华东化工学院学报

收录：Scopus;CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：沸石;分子筛;次级孔;晶体;当量直径

外文关键词：zeolite; pore size distribution; diffusion; catalysis; secondary pore; crystal; equivalent diameter

摘要：用Micromeritics ASAP 2400仪对多种沸石分子筛材料进行了低温氮吸附等温线的测定。通过BJH法和MP法的孔分布计算表明,可以用2.0nm(BJH法)或1.5nm(MP法)作为区分沸石晶体骨架结构中的微孔和次级孔的孔径界限值。对四种具有相近晶粒外形尺寸的Y型沸石样品的测定和MP法的计算表明,它们在1.6～2.4nm范围内分别有0.0035,0.0381,0.101和0.184mL/g次级孔,这种显著差别说明沸石中存在着晶粒内次级孔。在沸石晶体骨架结构微孔中的内扩散起控制作用的场合,可采用与球形颗粒比表面积相当的晶粒当量直径来反映晶内扩散时从中心到边缘的平均距离。上述四种样品的晶粒当量直径分别为0.66,0.085,0.037和0.023μm。
Nitrogen adsorption isotherms at liquid nitrogen temperature for hundreds zeolite material samples were determined by Micromeritics ASAP 2400. The results of pore size distribution calculated by BIH method and MP method showed that secondary pore can be distinguished from micropore inside framework by critical pore diameter of 2.0 nm (BIH) or 1.5 nm (MP). Four zeolite Y samples, which have nearly the same crystalline particle size, have 0.0035, 0.0381, 0.101, 0.184 mL/g pore volume within pore diameter of 1.6—2.4 nm (MP) respectively. The noticeable differences show that there are significant secondary pore volume inside zeolite crystalline particles. Equivalent diameter of crystalline particle represents the mean distance from center to edge for intrazeolite diffusion. For the above four samples, equivalent diameters of crystalline particle are 0.66, 0.085, 0.037, 0.023 μm respectively.