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Title: 石炭中の窒素と硫黄の化学形態と乾留過程での分配
Other Titles: Functional Forms of Nitrogen and Sulfur in Coals and Fate of Heteroatoms during Coal Carbonization
Authors: 坪内, 直人1 Browse this author →KAKEN DB
望月, 友貴2 Browse this author →KAKEN DB
小野, 洋平3 Browse this author
上坊, 和弥4 Browse this author
Authors(alt): Tsubouchi, Naoto1
Mochizuki, Yuuki2
Ono, Yohei3
Uebo, Kazuya4
Keywords: coal
nitrogen functonality
sulfur functionality
nitrogen distribution
sulfur distribution
Issue Date: May-2012
Publisher: 日本鉄鋼協会
Journal Title: 鉄と鋼
Volume: 98
Issue: 5
Start Page: 161
End Page: 169
Publisher DOI: 10.2355/tetsutohagane.98.161
Abstract: 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.
Rights: 著作権は日本鉄鋼協会にある
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 坪内 直人

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