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% H₂O₂ 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 H₂O₂ 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 H₂O₂ oxidative desulfurization by visible light irradiation.

摘要

为寻找绿色有效的化学脱硫方法，将光催化技术与氧化脱硫技术相结合，最大限度地降低煤中的硫含量。本文将30% H ₂ O ₂与原煤、脱盐煤、脱硫煤按5:1（ml:g）的比例混合，在可见光照射下进行不同时间的氧化脱硫反应。 , 并与相同条件下无光照的实验结果进行比较。IC 用于表征 SO ₄ ^2-采用化学法测定脱硫前后煤样中硫的形态，采用FTIR表征煤样脱硫前后含硫官能团含量的变化. 并对原煤、脱盐煤和脱硫煤进行光化学表征，探讨不同煤样的光化学性质，进一步探讨可见光照射对H ₂ O _{2促进作用的原因。}氧化脱硫。实验结果表明，可见光照射可显着提高脱硫效率。在最佳条件下，脱硫率可达67.68%，煤中大部分黄铁矿和部分有机硫被有效脱除。煤中的黄铁矿是可见光照射促进H ₂ O ₂氧化脱硫的主要原因。