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Fe-Zn catalysts for the production of high-calorie synthetic natural gas

Authors
Lee, Yong HeeLee, Dae-WonKim, HyoungsikChoi, Hyun SookLee, Kwan-Young
Issue Date
1-11월-2015
Publisher
ELSEVIER SCI LTD
Keywords
Synthetic natural gas; High-calorie methanation; Fischer-Tropsch synthesis; Fe-Zn catalyst; Heating value
Citation
FUEL, v.159, pp.259 - 268
Indexed
SCIE
SCOPUS
Journal Title
FUEL
Volume
159
Start Page
259
End Page
268
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/91945
DOI
10.1016/j.fuel.2015.06.076
ISSN
0016-2361
Abstract
In this study, Fe-Zn catalysts were applied in a methanation reaction, where the C-2-C-4 hydrocarbon selectivity was controlled in order to increase the heating value of the synthetic gas product. Fe-Zn catalysts were prepared by the co-precipitation method and were activated via two different pretreatments: carburization (using synthesis gas) and reduction (using diluted hydrogen). The active species within the carburized Fe-Zn catalysts primarily consisted of iron carbides, while magnetite was the dominant species in the reduced Fe-Zn catalysts. The carburized Fe-Zn catalysts exhibited a higher CO conversion between 95.9% and 98.2% compared to the reduced Fe-Zn catalysts with same composition (81.7-89.9%) due to stronger interactions with CO and a higher BET area. The carbon chain growth on both catalysts was nearly identical (0.18-0.23), but reduced Fe-Zn catalysts exhibited higher paraffin-to-olefin ratio up to 4.30, while the carburized catalysts achieved relatively low ratio between 1.95 and 2.76, because magnetite was more efficient in olefin hydrogenation than the iron carbides. The carburized and reduced Fe-Zn catalysts produced high-calorie synthetic natural gas with a heating value of over 56 MJ/Nm(3). (C) 2015 Elsevier Ltd. All rights reserved.
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공과대학 (화공생명공학과)
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