期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 125, 期 28, 页码 15647-15658出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c03975
关键词
-
资金
- Agence Nationale de la Recherche under project MATAREB [ANR-18-CE290009-01]
- GENCI grant [A0090807069]
A systematic study using density functional theory-based calculations on 134 pure SiO2 zeolites revealed that all pure-silica zeolites exhibit negative thermal expansion and different framework topologies greatly influence the thermal expansion coefficients. The computation of bulk modulus values showed a wide range, with most frameworks displaying pressure-induced softening.
We report a systematic study of the thermal and mechanical properties of 134 pure SiO2 zeolites through density functional theory-based calculations by making use of the quasi-harmonic approximation (out of a total of 242 known fully ordered zeolitic frameworks). The comparison of our results with reported experimental data for several zeolites revealed a very good accuracy and validated our simulation methodology. We observe a wide range of thermal expansion coefficients (from -5 to -35 MK-1), highlighting the great influence of the framework topology over this physical property, while demonstrating that all pure-silica zeolites exhibit negative thermal expansion. Our simulations also provide a path for the computation of the bulk modulus for each structure, as well as its pressure and temperature dependence. Results revealed a large gamut of bulk modulus values (from 8 to 134 GPa), showing that most frameworks display pressure-induced softening.but not all! Finally, this study provides some hints to the open question of experimental feasibility of zeolitic frameworks, showing that the experimentally synthesized structures appear to have a distinct distribution of thermal and mechanical properties.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据