文献类型：期刊文献

英文题名：Exploring the stability of Fe2O3-MgAl2O4 oxygen storage materials for CO production from CO2

作者：Buelens, Lukas C.[1];Dharanipragada, A. N. V. R.[1];Poelman, Hilde[1];Zhou, Zhiming[2];Marin, Guy B.[1];Galvita, Vladimir V.[1]

机构：[1]Univ Ghent, Lab Chem Technol, Technologiepk 914, B-9052 Ghent, Belgium;[2]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：29

起止页码：36

外文期刊名：JOURNAL OF CO2 UTILIZATION

收录：;EI(收录号：20184806163534);WOS:【SCI-EXPANDED(收录号:WOS:000456488700005)】；

基金：This work was supported by the Long Term Structural Methusalem Funding of the Flemish Government and the Fund for Scientific Research Flanders (FWO; project G004613N). L.C. Buelens acknowledges financial support from the Institute for the Promotion of Innovation through Science and Technology in Flanders (IWT Vlaanderen). The authors thank Dr. Vitaliy Bliznuk (Department of Materials Science and Engineering of Ghent University) for his technical support concerning transmission electron microscopy and Olivier Janssens (Department of Solid State Sciences, Ghent University) for performing X-ray diffraction and scanning electron microscopy measurements.

语种：英文

外文关键词：CO2 conversion; CO Production; Mg-Fe-Al-O; Iron oxide

摘要：The stability of Fe2O3-MgAl2O4 oxygen storage materials (OSMs) was investigated over 1000 redox cycles using H-2 as reductant and CO2 as oxidant. Three different materials, with a nominal Fe2O3 amount of 10 wt%, 30 wt% and 50 wt%, were evaluated. Characterization techniques such as N-2 adsorption, XRD and STEM-EDX were applied to study the evolution of morphological and crystallographic properties. XRD results show that Fe is incorporated in the MgAl2O4 lattice of the as prepared materials, yielding a Mg-Fe-Al-O spinel structure. After redox cycling, part of Fe still remains within the spinel. The results of redox cycling reveal superior properties for 10Fe(2)O(3)-MgAl2O4, exhibiting stability in terms of morphology and, with an average space-time yield of 700 mmol(CO) s(-1) kg(Fe)(-1), the highest activity among the OSMs studied. However, 50Fe(2)O(3)-MgAl2O4 performs best in terms of overall CO yield, i e. 0.6 mol CO kg(OSM)(-1), more than twofold higher compared to 10Fe(2)O(3)-MgAl2O4 and 30Fe(2)O(3)-MgAl2O4 even after 1000 cycles. Deactivation through sintering occurs in all three materials, though to a lesser extent for 10Fe(2)O(3)-MgAl2O4. Phase transformation to a MgxFe1-xO phase predominantly causes a loss of oxygen storage capacity in 30Fe(2)O(3)-MgAl2O4 and 50Fe(2)O(3)-MgAl2O4.