摘要
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.
出处
《南京师大学报(自然科学版)》
CAS
CSCD
1995年第2期36-39,共4页
Journal of Nanjing Normal University(Natural Science Edition)
关键词
沸石
比表面积
酸性
测定
氯硅烷
zeolite
specific surface area
organosilicon compounds
adsorption
acidity
determination