氯硅烷改性沸石比表面积及酸性的测定

The Measurement of the Specific Surface Area and Acidity of Y Zeolites Modified by Organosilicon Compounds

以有机硅化合物Ｓｉ（ＣＨ３）（４－ｎ）Ｃｌｎ（ｎ＝１，２，３，４）对ＮａＹ沸石进行改性处理，发现改性样品的比表面积有所减小，并且随着有机硅化合物中ＣＨ３数目增多，样品比表面积的减少愈甚．吡啶热脱附（ＰＴＤ）的结果表明沸石表面的Ｈ＋与Ｎａ＋同时成为吡啶的吸附中心，因此，用ＰＴＤ法测定合Ｎａ＋沸石的质子酸量是不适宜的．

Using organosilicon compounds such as Si(CH3)(4-n) Cln (n=1,2,3,4) to treat NaY zeolite can cause decrease of specific surface area of the sample.The more the number of CH3 in the organosilicon compound,the greater the decrease of the specific surface area of the correspondent modified sample.The pyridine thermal desorption(PTD)indicated that both H+ and Na+ are sites of pyridine adsorption over zeolites.It showed that PTD can not be used uniquely to measure the H+ amount of zeolites that contained Na+ ions.