International Journal of Coal Preparation and Utilization ( IF 2.1 ) Pub Date : 2022-07-04 , DOI: 10.1080/19392699.2022.2096014 Ning Ding, Mei Li, Jinsong Yue, Sidan Cheng, Shiyong Xu, Rongsheng Xu
ABSTRACT
In order to investigate the effect of visible light irradiation on oxidative desulfurization. Three kinds of coals (SM, YYH and GZ) and four sulfur model compounds were selected as research objects. The effects of different irradiation time (30, 60, 90 and 120 min) and light source power (150, 220 and 300 W) of coal desulfurization were investigated. The samples before and after desulfurization were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). The results show that when coal:H2O2 = 1:5 (g:mL), light source power is 220 W and irradiation is 60 min, the desulfurization rate of SM, YYH and GZ can reach the maximum, which were 27.97%, 56.28% and 66.22%, respectively. According to the characterization of samples before and after desulfurization, it was found that the low-valence sulfur changes into the high-valence sulfur with a more stable structure through a certain transition state during the desulfurization process. Coal responds to visible light, which can promote the generation of electron–hole pairs in the system, so as to enhance the oxidative desulfurization ability of the system. Visible light irradiation can promote the production of strong oxidation active group HO·, thereby improving the desulfurization rate of coal.
中文翻译:
可见光辅助氧化系统从高硫煤中脱硫的机理
摘要
为了研究可见光照射对氧化脱硫的影响。选择三种煤(SM、YYH和GZ)和四种硫模型化合物作为研究对象。考察了不同照射时间(30、60、90、120 min)和光源功率(150、220、300 W)对煤脱硫效果的影响。采用傅里叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)和电化学阻抗谱(EIS)对脱硫前后的样品进行表征。结果表明,当煤:H 2 O 2 = 1:5 (g:mL),光源功率为220 W,照射时间为60 min,SM、YYH和GZ的脱硫率最高,分别为27.97%、56.28%和66.22%。根据脱硫前后样品的表征发现,在脱硫过程中,低价硫通过一定的过渡态转变为结构更稳定的高价硫。煤对可见光的响应,可以促进体系中电子-空穴对的产生,从而增强体系的氧化脱硫能力。可见光照射可促进强氧化活性基团HO·的生成,从而提高煤的脱硫率。