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Permanent link (DOI): https://doi.org/10.7939/R30V89X3S

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Study of the Thermal Stability of Hydrotalcite and Carbon Dioxide Capture Capacity of Hydrotalcite-derived Mixed Oxides using Molecular Dynamics Simulation Open Access

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Other title
Subject/Keyword
Molecular dynamics
Carbon dioxide adsorption
Layered double hydroxides
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Gao, Muziyuan
Supervisor and department
Zhang, Hao (Chemical and Materials Engineering)
Examining committee member and department
Liu, Jinfeng (Chemical and Materials Engineering)
Choi, Phillip (Chemical and Materials Engineering)
Gupta, Rajender (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Materials Engineering
Date accepted
2017-09-20T11:14:24Z
Graduation date
2017-11:Fall 2017
Degree
Master of Science
Degree level
Master's
Abstract
Hydrotalcites (HTlcs) or layered double hydroxides (LDHs) are used in a wide range of applications such as catalysis, electrochemical sensors, wastewater treatment and carbon dioxide (CO2) capture. In this study, molecular dynamics simulation was employed to investigate carbon dioxide adsorption in amorphous layered double oxides (LDOs) derived from LDHs at elevated temperatures. The thermal stability of LDH was first examined by heating the sample up to T = 1700 K. Radial distribution functions confirmed the structural evolution upon heating and was in excellent agreement with experiments, where periclase was the main observed phase in the XRD patterns of the recrystallized mixed oxides above T = 1200 K. Further, CO2 adsorption capacity was studied as a function of amorphous HTlc-derived oxide composition, where static and dynamic atomistic measures have been employed to characterize CO2 capture capacity. We found that the CO2 dynamic residence time on LDH-derived LDOs was sensitive to the Mg/Al molar ratio and CO2 capture capacity reached maximum when the Mg/Al molar ratio was equal to 3.0. Meanwhile, the activation energy for diffusion also shows local maximum when the Mg/Al molar ratio is 3.0, suggesting that this particular ratio of Mg-Al mixed oxides possesses the highest CO2 adsorption capacity and that it is consistent with experimental results. Examination of the binding between CO2 and mixed oxides suggests that both magnesium and oxygen in amorphous LDOs contribute to CO2 adsorption. Moreover, the effect of Mg-O and O (LDO)-C interaction are the most significant and the highest CO2 adsorption capacity was observed in the system with the most Mg-O bindings and O (LDO)-C bindings.
Language
English
DOI
doi:10.7939/R30V89X3S
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
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