摘要
用红外光谱研究温度对沸石酸性的影响,结果表明,温度使沸石表面酸性(酸强度)增强,酸性增强的规律是大孔道或大孔腔中的酸性羟基>表面硅醇基(或缺陷羟基)>小笼中的酸性羟基,在所研究的温度范围内(290～510 K)酸性随温度的变化呈线性关系。
Effects of temperature on the acidity of zeolites were studied by using IR spectrometry. The experimental results show that the acidities (acid strength) of the zeolites are increased as temperature increases. The increase of the acidities of the diffrent -OH groups has the following order: acidic -OH groups located in the big cavities (supercages in the zeolite Y and main channels in the ZSM-5) > Si-OH on the external surface or on the defect positions > acidic -OH groups located in the small cages (D-6 membered rings in the zeolite Y), The changes of the acidities are linear with increasing temperature over the temperature range employed in the study.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1990年第8期851-854,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
沸石
ZSM-5
酸性
温度
红外光谱
Infrared spectra, Temperature, Acidity, Y type zeolite, ZSM-5
