NDLI: A coal desulfurization process via sodium metaborate electroreduction with pulse voltage using a boron-doped diamond thin film electrode

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A coal desulfurization process via sodium metaborate electroreduction with pulse voltage using a boron-doped diamond thin film electrode

Content Provider	Royal Society of Chemistry (RSC)
Author	Shu, Chenhua Lou, Ziyang Sun, Tonghua Jia, Jinping Shen, Yafei
Copyright Year	2013
Abstract	A preliminary study was conducted on the coal desulfurization process via NaBO2 electroreduction with pulse voltage using a boron-doped diamond (BDD) thin film electrode. It has been proved that NaBO2 was converted into NaBH4 by 11B NMR. The factors that influence the conversion rate of NaBO2 into NaBH4 and coal desulfurization efficiency were investigated. Under the conditions of −1.5 V forward pulse voltage, +0.5 V reverse pulse voltage, 0.2 mol L−1 NaBO2 concentration, 0.5 mol L−1 NaOH concentration, 2 s forward pulse duration, 1 s reverse pulse duration, 50 g L−1 coal concentration, 0.8 mmol L−1 NiCl2 concentration and 2.5 h electrolytic time, a higher desulfurization efficiency (64%) was obtained compared with the common electrochemical desulfurization (ECDS) process using a Pt electrode. By analyzing and comparing the coal samples and electrolytes before and after desulfurization it was indicated that the removed S from the coal sample in the form of gaseous H2S was mainly converted into Na2S and Na2Sx and boron (B) recycling was realized during coal desulfurization. Particularly, the combustion characteristics of coal were improved after desulfurization. Finally, the desulfurization mechanism was proposed. All these results indicated that the desulfurization process via NaBO2 electroreduction with pulse voltage using a BDD thin film electrode is effective and highly promising for coal desulfurization.
Starting Page	1476
Ending Page	1485
Page Count	10
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	3
Issue Number	5
Journal	RSC Advances
DOI	10.1039/c2ra21604c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Hydrogen sulfide Boron Electrode Desulfurisation Electrochemistry Nickel(II) chloride Sodium borohydride Nuclear magnetic resonance
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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