Journal of the Japan Institute of Energy
Online ISSN : 1882-6121
Print ISSN : 0916-8753
ISSN-L : 0916-8753
Original Paper
Study on Chemical Form of Boron in Coal by Solid-State Nuclear Magnetic Resonance Spectroscopy
Takashi KUWABARAShinji KAMBARAHiroshi MORITOMI
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2007 Volume 86 Issue 7 Pages 455-461

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Abstract

The aim of this paper is to investigate boron species in coals in order to research partitioning of boron in pulverized coal-fired process. Some extracted coal samples using specific gravity separation and these LTA (Low Temperature Ash) samples were treated with leaching of pure water. Solid-state MAS 11B-NMR spectra of these coals and LTA samples were obtained. Chemical shift of boron species in coal was observed both trigonal and tetrahedral coordinated boron and existent ratio was different with kinds of coal. It was estimated that a part of boron in coal was existed as water-soluble compounds and its chemical form was boric acid and its anhydride, borate of alkaline and alkaline earth metals, and then these compounds minutely dispersed in organic matter of coal.

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© 2007 The Japan Institute of Energy
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