摘要
建立了一种应用多晶Ｘ射线散射测定Ｈβ沸石结晶度的方法。它避开了非相干散射，只应用相干散射。以内标物ＣａＦ２与自制的Ｈβ沸石按不同比例配制成ＣａＦ２－Ｈβ系列样品，应用Ｈβ沸石和ＣａＦ２的结构参数，对此系列样品进行相干散射强度计算值与观察值的拟合，解出此样品Ｈβ的结晶度ｘβ为０．８５。再以此ｘβ和Ｈβ，ＣａＦ２的相干散射强度ΣＩβ，ΣＩａ代入内标法相定量公式中，求得常数Ｋ为０．２５０。
The framework of zeolite β is a kind of stacking fault structure,and its X ray powder scattering pattern is characterized by a coexistence of coherent scattering and non coherent scattering.The non coherent scattering of zeolite β overlaps with those of diffuse scattering from non crystalline phase.Therefore it is impossible to determine the crystallinity by conventional techniques.This study developed a method for the determination of the crystallinity of zeolite Hβ,only by using coherent scattering but avoiding non coherent scattering.A series of mixed samples with different ratios of CaF 2 to Hβ was prepared.Based on the structural parameters of CaF 2 and Hβ,the intensities of coherent scattering were calculated and the crystallinity of 0 85 of this Hβ sample was obtained by fitting the calculated data to those of experiment until a reasonable goodness of fit was reached.Subsequently,the coefficient K of 0 250 was worked out by inner standard method.With CaF 2 as inner standard,the formula for determining the crystallinity of Hβ can be written as: x β=x a0 250(1-x a)·ΣI βΣI a Where x a stands for the mass fraction of CaF 2,ΣI β and ΣI a stand for experimental coherent scattering intensities of Hβ and CaF 2 in this mixture respectively.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
1999年第3期58-62,共5页
Acta Petrolei Sinica(Petroleum Processing Section)
