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分子筛结构中的Si-O和Al-O键伸展频率,它们混合峰的极大值与样品中含铝克原子分数成线性关系。关系式为:Y=aN_(Al)/(N_(Sl)+N_(Al))+b或改写为与克分子比的关系式为:Y=a2/(2+N_(SiO_2)/N_(Al_2O_3))+b 式中a,b为常数,对八面沸石(X,Y型),a=—20.3cm~(-1)/0.1克原子铝,b=1080.5cm~(-1)。对丝光沸石(钠型和氢型)为a=—26.7cm~(-1)/0.1克原子铝,b=1101.4cm~(-1)。该方法同样适用于其它类型分子筛硅铝比的测定。该方法的特点是:样品用量少,分析时间短,操作简便。
Molecular sieve structure of the Si-O and Al-O bond stretching frequency, the peak value of their mixing peak and the sample containing aluminum grams of grams of a linear relationship. The relationship is: Y = aN_ (Al) / (N_ (S1) + N_ (Al)) + b or rewritten as the molar ratio of the relationship: Y = a2 / (2N_ (SiO2) / N_ Al 2 O 3)) + b where a and b are constants, a = -20.3 cm -1 /0.1 g atomic aluminum and f = 1080.5 cm -1 for faujasite (type X, Y). The mordenite (sodium and hydrogen type) a = -26.7cm -1 /0.1g atom of aluminum, b = 1101.4cm -1. This method is equally applicable to the determination of other types of molecular sieve silicon aluminum ratio. The method is characterized by: less sample, analysis time is short, easy to operate.