In:
Journal of Nanoscience and Nanotechnology, American Scientific Publishers, Vol. 20, No. 11 ( 2020-11-01), p. 7075-7080
Abstract:
Fe 2 O 3 is the major component of red mud, which is a by-produced after eluting aluminum from bauxite in the Bayer process, and can be used as an oxygen carrier. On the other hand, red mud is unsuitable for using oxygen in the crystal lattice because of its low surface
area. In this study the red-mud sample was sulfidated at high temperatures to improve the lattice oxygen mobility by forming lattice defects in the iron oxide crystals. To form crystal defects on red mud, iron oxide was converted to iron sulfide with hydrogen sulfide, and then re-oxidized by air to remove the sulfur components. In these processes, it was possible to generate defects could be generated in the crystal structure. Crystal defects are formed by the difference in the molar volume of oxygen and sulfur bound to the metal in the oxidation-sulfidation process. The surface
area of the defective red mud increased from approximately 25.9 m 2 /g to 122.1 m 2 /g, and the pore volume increased from 0.1714cc/g to 0.2803 cc/g. In addition, the formation of crystal defects increased the oxygen transfer capacity of red mud from 1.75% to 2.25% at 15
vol.% hydrogen. This means that the amount of oxygen transported during the reduction process could be enhanced approximately 1.29 fold.
Type of Medium:
Online Resource
ISSN:
1533-4880
DOI:
10.1166/jnn.2020.18845
Language:
English
Publisher:
American Scientific Publishers
Publication Date:
2020
SSG:
11
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