Studies of the mechanical and extreme hydrothermal properties of periodic mesoporous silica and aluminosilica materials

Dayton G. Kizzire; Sonal Dey; Robert A. Mayanovic; Ridwan Sakidja; Kai Landskron; Manik Mandal; Zhongwu Wang; Mourad Benamara

doi:10.1016/j.micromeso.2017.06.016

Studies of the mechanical and extreme hydrothermal properties of periodic mesoporous silica and aluminosilica materials

Dayton G. Kizzire, Sonal Dey, Robert A. Mayanovic, Ridwan Sakidja, Kai Landskron, Manik Mandal, Zhongwu Wang, Mourad Benamara

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

In order to assess the suitability of mesoporous materials for applications in energy harvesting/storage processes occurring under extreme conditions, their mechanical, thermal and hydrothermal properties need to be fully investigated. In this study, the bulk mechanical and extreme hydrothermal properties of periodic mesoporous SBA-15 type silica and SBA-15 type aluminosilica (Al-SBA-15) were investigated using in situ small angle x-ray scattering (SAXS). In situ SAXS measurements were made on dry mesoporous SBA-15 silica and Al-SBA-15 aluminosilica samples as a function of pressure (at room temperature) to ∼ 12 GPa and on the same mesoporous materials under extreme hydrothermal conditions (to 255 °C and ∼114 MPa) using the diamond anvil cell (DAC). The analyses of the high-pressure SAXS data indicate that the mesoporous Al-SBA-15 aluminosilica has substantially greater bulk mechanical stability (isothermal bulk modulus κ = 34.7(4.5) GPa) than the mesoporous SBA-15 silica (κ = 12.0(3.0) GPa). Our molecular dynamics (MD) simulations are able to accurately model the bulk mechanical stability properties of mesoporous SBA-15 silica but underestimate the same properties of Al-SBA-15 aluminosilica. Analysis of the in situ SAXS data measured under extreme hydrothermal conditions indicates swelling of the pore walls due to water incorporation that is more significant in mesoporous Al-SBA-15 aluminosilica (∼2x) than in SBA-15 silica. In addition, the Al-SBA-15 aluminosilica clearly exhibits superior hydrothermal stability compared to SBA-15 silica under the extreme experimental temperature and pressure conditions.

Original language	English
Pages (from-to)	69-78
Number of pages	10
Journal	Microporous and Mesoporous Materials
Volume	252
DOIs	https://doi.org/10.1016/j.micromeso.2017.06.016
State	Published - 2017
Externally published	Yes

Funding

DK, SD, KL and RAM acknowledge partial support from EFree, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0001057. The x-ray scattering measurements were made at the Cornell High Energy Synchrotron Source, which is supported by the National Science Foundation and the National Institutes of Health/National Institutes of General Medical Sciences under NSF award DMR-1332208. DK and RAM acknowledge support from the NASA Missouri Space Grant Consortium via grant number NNX10AI92H. This work used the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation grant number ACI-1053575. We thank Rishi Patel for performing the XPS measurements at the JVIC center of Missouri State University. We also wish to thank the reviewers for their constructive comments which have led to improvements of our manuscript.

Funders	Funder number
National Science Foundation	DMR-1332208
National Institutes of Health
U.S. Department of Energy
National Institute of General Medical Sciences
Mississippi Space Grant Consortium	NNX10AI92H, ACI-1053575
Office of Science
Basic Energy Sciences	DE-SC0001057

Keywords

Hydrothermal stability
Mechanical stability
Mesoporous aluminosilica
Mesoporous silica
Small-angle X-ray diffraction

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10.1016/j.micromeso.2017.06.016

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title = "Studies of the mechanical and extreme hydrothermal properties of periodic mesoporous silica and aluminosilica materials",

abstract = "In order to assess the suitability of mesoporous materials for applications in energy harvesting/storage processes occurring under extreme conditions, their mechanical, thermal and hydrothermal properties need to be fully investigated. In this study, the bulk mechanical and extreme hydrothermal properties of periodic mesoporous SBA-15 type silica and SBA-15 type aluminosilica (Al-SBA-15) were investigated using in situ small angle x-ray scattering (SAXS). In situ SAXS measurements were made on dry mesoporous SBA-15 silica and Al-SBA-15 aluminosilica samples as a function of pressure (at room temperature) to ∼ 12 GPa and on the same mesoporous materials under extreme hydrothermal conditions (to 255 °C and ∼114 MPa) using the diamond anvil cell (DAC). The analyses of the high-pressure SAXS data indicate that the mesoporous Al-SBA-15 aluminosilica has substantially greater bulk mechanical stability (isothermal bulk modulus κ = 34.7(4.5) GPa) than the mesoporous SBA-15 silica (κ = 12.0(3.0) GPa). Our molecular dynamics (MD) simulations are able to accurately model the bulk mechanical stability properties of mesoporous SBA-15 silica but underestimate the same properties of Al-SBA-15 aluminosilica. Analysis of the in situ SAXS data measured under extreme hydrothermal conditions indicates swelling of the pore walls due to water incorporation that is more significant in mesoporous Al-SBA-15 aluminosilica (∼2x) than in SBA-15 silica. In addition, the Al-SBA-15 aluminosilica clearly exhibits superior hydrothermal stability compared to SBA-15 silica under the extreme experimental temperature and pressure conditions.",

keywords = "Hydrothermal stability, Mechanical stability, Mesoporous aluminosilica, Mesoporous silica, Small-angle X-ray diffraction",

author = "Kizzire, {Dayton G.} and Sonal Dey and Mayanovic, {Robert A.} and Ridwan Sakidja and Kai Landskron and Manik Mandal and Zhongwu Wang and Mourad Benamara",

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T1 - Studies of the mechanical and extreme hydrothermal properties of periodic mesoporous silica and aluminosilica materials

AU - Kizzire, Dayton G.

AU - Dey, Sonal

AU - Mayanovic, Robert A.

AU - Sakidja, Ridwan

AU - Landskron, Kai

AU - Mandal, Manik

AU - Wang, Zhongwu

AU - Benamara, Mourad

PY - 2017

Y1 - 2017

N2 - In order to assess the suitability of mesoporous materials for applications in energy harvesting/storage processes occurring under extreme conditions, their mechanical, thermal and hydrothermal properties need to be fully investigated. In this study, the bulk mechanical and extreme hydrothermal properties of periodic mesoporous SBA-15 type silica and SBA-15 type aluminosilica (Al-SBA-15) were investigated using in situ small angle x-ray scattering (SAXS). In situ SAXS measurements were made on dry mesoporous SBA-15 silica and Al-SBA-15 aluminosilica samples as a function of pressure (at room temperature) to ∼ 12 GPa and on the same mesoporous materials under extreme hydrothermal conditions (to 255 °C and ∼114 MPa) using the diamond anvil cell (DAC). The analyses of the high-pressure SAXS data indicate that the mesoporous Al-SBA-15 aluminosilica has substantially greater bulk mechanical stability (isothermal bulk modulus κ = 34.7(4.5) GPa) than the mesoporous SBA-15 silica (κ = 12.0(3.0) GPa). Our molecular dynamics (MD) simulations are able to accurately model the bulk mechanical stability properties of mesoporous SBA-15 silica but underestimate the same properties of Al-SBA-15 aluminosilica. Analysis of the in situ SAXS data measured under extreme hydrothermal conditions indicates swelling of the pore walls due to water incorporation that is more significant in mesoporous Al-SBA-15 aluminosilica (∼2x) than in SBA-15 silica. In addition, the Al-SBA-15 aluminosilica clearly exhibits superior hydrothermal stability compared to SBA-15 silica under the extreme experimental temperature and pressure conditions.

AB - In order to assess the suitability of mesoporous materials for applications in energy harvesting/storage processes occurring under extreme conditions, their mechanical, thermal and hydrothermal properties need to be fully investigated. In this study, the bulk mechanical and extreme hydrothermal properties of periodic mesoporous SBA-15 type silica and SBA-15 type aluminosilica (Al-SBA-15) were investigated using in situ small angle x-ray scattering (SAXS). In situ SAXS measurements were made on dry mesoporous SBA-15 silica and Al-SBA-15 aluminosilica samples as a function of pressure (at room temperature) to ∼ 12 GPa and on the same mesoporous materials under extreme hydrothermal conditions (to 255 °C and ∼114 MPa) using the diamond anvil cell (DAC). The analyses of the high-pressure SAXS data indicate that the mesoporous Al-SBA-15 aluminosilica has substantially greater bulk mechanical stability (isothermal bulk modulus κ = 34.7(4.5) GPa) than the mesoporous SBA-15 silica (κ = 12.0(3.0) GPa). Our molecular dynamics (MD) simulations are able to accurately model the bulk mechanical stability properties of mesoporous SBA-15 silica but underestimate the same properties of Al-SBA-15 aluminosilica. Analysis of the in situ SAXS data measured under extreme hydrothermal conditions indicates swelling of the pore walls due to water incorporation that is more significant in mesoporous Al-SBA-15 aluminosilica (∼2x) than in SBA-15 silica. In addition, the Al-SBA-15 aluminosilica clearly exhibits superior hydrothermal stability compared to SBA-15 silica under the extreme experimental temperature and pressure conditions.

KW - Hydrothermal stability

KW - Mechanical stability

KW - Mesoporous aluminosilica

KW - Mesoporous silica

KW - Small-angle X-ray diffraction

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DO - 10.1016/j.micromeso.2017.06.016

M3 - Article

AN - SCOPUS:85020807922

SN - 1387-1811

VL - 252

SP - 69

EP - 78

JO - Microporous and Mesoporous Materials

JF - Microporous and Mesoporous Materials

ER -

Studies of the mechanical and extreme hydrothermal properties of periodic mesoporous silica and aluminosilica materials

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Keywords

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