Functional Forms of Nitrogen and Sulfur in Coals and Fate of Heteroatoms during Coal Carbonization
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- Tsubouchi Naoto
- Center for Advanced Research of Energy and Materials, Faculty of Engineering, Hokkaido University
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- Mochizuki Yuuki
- Center for Advanced Research of Energy and Materials, Faculty of Engineering, Hokkaido University
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- Ono Yohei
- Sakaide Plant, Mitsubishi Chemical Corporation
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- Uebo Kazuya
- Corporate Research & Development Laboratories, Sumitomo Metal Industries, Ltd.
Bibliographic Information
- Other Title
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- 石炭中の窒素と硫黄の化学形態と乾留過程での分配
- セキタン チュウ ノ チッソ ト イオウ ノ カガク ケイタイ ト カンリュウ カテイ デ ノ ブンパイ
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Description
The functionalities of the nitrogen (coal-N) and sulfur (coal-S) present in three caking coals with carbon contents of 76-81 wt%-dry and the fate of these heteroatoms during coal carbonization have mainly been studied by the X-ray photoelectron spectroscopy (XPS) and with a fixed bed quartz reactor, respectively. The XPS measurements exhibit that about 80-90 % of the coal-N exists as pyrrolic-N and pyridinic-N, and the rest can be assigned to quaternary-N (pyridinic-N associated with the hydroxyl groups from phenols or carboxylic acids), whereas the coal-S consists of thiophenic-S, alkyl-S and FeS2, and the proportion of the former is as high as 60-70 %. When the coal sample is carbonized in He at a heating rate of 3°C/min, yield of N-containing species observed at 1000°C increases in the order of HCN ≤ tar-N < NH3 < N2 < oil-N < coke-N, regardless of the type of coal, and the latter two are present predominantly as NH4+ and in polynuclear aromatic structures, respectively. On the other hand, yield of S-containing species at 1000°C increases in the order of COS < CS2 < tar-S < oil-S < H2S < coke-S with all coals, and more than 95 % of the coke-S can be regarded as thiophenic-S. These tendencies are also observed with physical mixtures of each coal investigated. Possible mechanisms for the formation of gaseous N- or S-containing compounds in the carbonization process are discussed on the basis of the results of some thermodynamic calculations.
Journal
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- Tetsu-to-Hagane
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Tetsu-to-Hagane 98 (5), 161-169, 2012
The Iron and Steel Institute of Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390282680103108480
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- NII Article ID
- 130002127290
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- NII Book ID
- AN00151251
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- ISSN
- 1341688X
- 18832954
- 00211575
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- COI
- 1:CAS:528:DC%2BC38XntlWrsb4%3D
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- HANDLE
- 2115/79338
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- NDL BIB ID
- 023760586
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- Text Lang
- ja
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- Data Source
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- JaLC
- IRDB
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed