Mg-Ion Inversion in MgO@Al₂O₃ Oxides: The Origin of Basic Sites
- Authors
- Hiremath, Vishwanath; Kwon, Hyuk Jae; Jung, In-Sun; Kwon, Soonchul; Kwon, Sung Hyun; Lee, Seung Geol; Lee, Hyun Chul; Seo, Jeong Gil
- Issue Date
- Jun-2019
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- carbon capture; metal oxides; sorbents; spinel phases; structure elucidation
- Citation
- CHEMSUSCHEM, v.12, no.12, pp.2810 - 2818
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMSUSCHEM
- Volume
- 12
- Number
- 12
- Start Page
- 2810
- End Page
- 2818
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/13416
- DOI
- 10.1002/cssc.201900072
- ISSN
- 1864-5631
- Abstract
- Although MgO-Al2O3 is well known as having a spinel structure, the inversion of which occurs by exchange of the trivalent (Al3+) and divalent (Mg2+) cations, little analytical study of the degree of inversion has been carried out. This study concerns a simple methodology to identify the inversion by solid-state NMR spectroscopy, whereby its correlation with the CO2 capture capacity of MgO-rich MgO@MgO-Al2O3 spinel structures is verified. Through Al-27 and Mg-25 NMR spectroscopy, temperature-programmed CO2 desorption, and thermogravimetric analysis, higher inversion is found to occur at low Mg/Al ratios and the inversion is found to decrease as the Mg/Al ratio increases. Moreover, the degree of inversion correlates with CO2 sorption, which is associated with the medium-strength basic sites induced by formation of the unsaturated O2- species. These results will open new pathways to exploit defects in complex oxides beyond spinels and their derivatives for desired applications. This demonstration of MgO-Al2O3 for CO2 sorption can contribute to the design of future CO2 sorbents.
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