摘要
考察了酸处理对β沸石的结构和酸性的影响；发现β沸石的骨架虽易脱铝，但能抗５ｍｏｌ／ＬＨＣｌ，在５ｍｏｌ／ＬＨＣｌ中，β沸石的脱铝程度可达８０．０％以上。β沸石中四方晶系的耐酸性比单斜晶系差，故可通过酸处理调节β沸石的手性。吸附表明，酸处理对β沸石的孔容影响不大。ＮＨ３－ＴＰＤ及Ｐｙ－ＩＲ结果表明，β沸石经酸处理后，其酸强度增加，在Ｓｉ／Ａｌ＝３８．８样品上达到最强，表面酸以Ｌ酸为主，且随Ｓｉ／Ａｌ比的增加而增强。
The effect of acid treatment on the structure and acidity of β zeolite was investigated. It was found thatβzeoliteis easily dealuminated by acid treatment,but it can resist 5 mol/L HCl solution.The degree of dealumination is higher than 80% in the 5 mol/L HCl solution.In the acid solution the stability of polymorph(A)is less than that of(B).The chiral of βzeolite can be modified by acid treatment.The results of adsorption, NH3-TPD and pyridine-IR show that the pore volume does not change obviously,the acid strength of sample changes with acid treatment and reaches its maximum in the sample with the Si/Al of 38.8.L acid is the main acid sites on the surface and increases with increasing the value of Si/Al ratio.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1995年第6期943-947,共5页
Chemical Journal of Chinese Universities
基金
石油化学工业总公司基金
关键词
Β沸石
酸处理
多晶稳定性
孔径和酸性
Zeolite Acid treatment Polymorph stability Pore and acidity
