摘要
孔径是沸石分子筛的一个重要物性常数,与沸石在吸附分离、催化等应用有密切关系。因此,准确测定、分析其孔径分布具有重要意义。采用N_(2)、Ar和CO_(2)为吸附质气体,通过物理吸附法测定5A沸石分子筛的孔径分布,详细研究吸附质气体、吸附温度以及计算方法对孔径分布的影响。结果表明:采用Ar或CO_(2)作为吸附质,并使用Saito-Foley(SF)或非限定域密度泛函理论(NLDFT)计算方法可以准确分析5A沸石分子筛的微孔孔径分布。该实验结果和讨论将有助于进一步加深对微孔孔径分析的理解,为在实验中选择合适的测量方法提供参考。
The pore size is an important physical constant of zeolite molecular sieve,which is closely related to the application of zeolite in adsorption,separation and catalysis.Therefore,it is of great significance to accurately measure and analyze the pore size distribution.The pore size distribution of 5A zeolite molecular sieves was characterized based on the physisorption method by using N_(2),Ar and CO_(2) as the adsorbent gases.The influences of adsorbent gas,adsorption temperature and calculation method on the pore size distribution were studied in detail.The results showed that using Ar or CO_(2) as adsorbent and Saito-Foley(SF)or non-local density functional theory(NLDFT)calculation method can accurately analyze the micropore distribution of 5A zeolite molecular sieves.The results and discussion will be helpful to further understand the micropore size analysis and provide guidance for selecting appropriate measurement method in the experiment.
作者
王金秀
洪锦德
WANG Jinxiu;HUNG Chinte(Laboratory of Advanced Materials,Fudan University,Shanghai 200438,China)
出处
《中国测试》
CAS
北大核心
2021年第9期1-6,共6页
China Measurement & Test
基金
国家重点研发计划战略性国际科技创新合作重点专项(2018YFE0201700)。
关键词
物理吸附
表征
沸石
孔径
physisorption
characterization
zeolite
pore size
