Citation: LI Mei, JIN Quan, SUN Gong-cheng, CHENG Xue-yun, LI Jia-jia, XU Rong-sheng. Removal mechanism of organic sulfur in coal assisted by microwave irradiation[J]. Journal of Fuel Chemistry and Technology, ;2019, 47(10): 1153-1162. shu

Removal mechanism of organic sulfur in coal assisted by microwave irradiation

LI Mei ^1,2,3,, ,
JIN Quan ¹ ,
SUN Gong-cheng ¹ ,
CHENG Xue-yun ¹ ,
LI Jia-jia ¹ ,
XU Rong-sheng ¹

1.
School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan 750021, China
2.
Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan 750021, China
3.
Key Laboratory for Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan 750021, China

Corresponding author: LI Mei, echolimei@126.com
Received Date: 20 May 2019
Revised Date: 9 July 2019

Fund Project: Graduate Innovation Project of North Minzu University YCX19114Research Platform Project of North Minzu University 201707the National Science Foundation of China 21666001The project was supported by the National Science Foundation of China (21666001), Scientific Research Project of North Minzu University (2017HG04), Major Research Project of North Minzu University (ZDZX201803), Research Platform Project of North Minzu University (201707) and Graduate Innovation Project of North Minzu University (YCX19114)Scientific Research Project of North Minzu University 2017HG04Major Research Project of North Minzu University ZDZX201803

Figures(9)

In order to clarify the effect of microwave field combined with peracetic acid (PAA) on the removal of organic sulfur in coal, four demineralized coals including Shanxi Linfeng (LF), Ningxia Ningdong (ND), Shanxi Lingshi (LS) and Henan Luoyang (LY) coal were selected, and three sulfur-containing model compounds including benzyl mercaptan (BM), benzo(b) thiophene (BT) and diphenyl sulfoxide (DS) were used as well. Each test, the microwave with the power of 100 W irradiated coal for 1-5 min combined with PAA. The change of sulfur form in the solid phase was analyzed by X-ray photoelectron spectroscopy (XPS). The concentration of SO₄^2- in the liquid phase after desulfurization was analyzed by ion chromatography (IC), and the change of sulfur form in the extract was analyzed by gas chromatography/mass spectrometry (GC/MS). The results show that the higher the organic sulfur content, the greater the desulfurization rate. The maximum desulfurization rates of LY and LS are as high as 55.06% and 45.78%, respectively, and the maximum desulfurization rates of ND and LF are 31.24% and 28.21%, respectively. It is found that the organic sulfur as mercaptan in coal is easier to remove than that as thiophene and sulfoxide, and the sulfur form gradually transforms to a high valence state during desulfurization. The sulfur-containing bond is broken in the microwave field and the sulfur can be oxidized to SO₄^2- by PAA finally.
- desulfurization,
- microwave,
- organic sulfur,
- GC/MS,
- sulfur-containing model compound
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1.
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