Visible-light-assisted efficient removal of sulfur from high sulfur coal under mild conditions. Issue 10 (3rd October 2022)

• Record Type: Journal Article
• Authors: Sun, Gongcheng; Li, Mei; Cheng, Xueyun; Ding, Ning; Yue, Jingsong; Cheng, Sidan
• Is Part Of: International journal of coal preparation and utilization. Volume 42:Issue 10(2022)
• Page Start: 2865
• Page End: 2879
• Publication Date: 2022-10-03
• Subjects: Photocatalysis -- oxidation desulfurization -- forms of sulfur -- FeS2 -- light response; Coal preparation -- Periodicals; Coal -- Research -- Periodicals; 662.62
• DOI: 10.1080/19392699.2021.1910504
• Languages: English
• ISSNs: 1939-2699

Abstract

ABSTRACT: In order to find a green and effective chemical desulfurization method, the photocatalytic technology and oxidative desulfurization were combined to minimize the sulfur content in coals. In this paper, 30% H2 O2 was mixed with raw coal, demineralized coal, and removal pyrite coal at a ratio of 5:1 (ml: g), the oxidative desulfurization reaction was carried out with visible light irradiation for different times, and compared with the experimental results without light irradiation under the same condition. IC was used to characterize the SO4 2- content in the filtrate of the reaction mixture, and the chemical method was used to determine the forms of sulfur in coal samples before and after desulfurization, FTIR was used to characterize the change of sulfur-containing functional group content in coal samples before and after desulfurization. And the photochemical characterization of raw coal, demineralized coal and removal pyrite coal were carried out to explore the photochemical properties of different coal samples, further explored the reasons for the promoting effect of visible light irradiation on H2 O2 oxidation desulfurization. The experimental results showed that the desulfurization efficiency can be significantly enhanced by visible light irradiation. Under the optimum conditions, the desulfurization rate can reach 67.68%, most of the pyrite and part of organic sulfur in coals were effectively removed. The pyrite in coal was the main reason for the promotion of H2 O2 oxidative desulfurization by visible light irradiation.