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Ultraviolet Raman spectra: The reasonable method of evaluating coal pyrolysis graphitization
Aip Advances ( IF 1.4 ) Pub Date : 2020-11-04 , DOI: 10.1063/5.0018691
Pengxiang Wang 1 , Mingjun Liu 1 , Tong Pei 1 , Lei Zhang 1, 2 , Zhipeng Qie 1 , Xiaohui Li 3 , Yang Yu 3 , Minghong Han 3 , Fei Sun 1 , Wei Zhou 1 , Jihui Gao 1 , Guangbo Zhao 1
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Raman spectrum is a common method of evaluating the graphitization degree of carbon materials. However, there is still some controversy over its evaluation for coal graphitization, i.e., whether large ID/IG means a high graphitization degree of coal. This work uses an ultraviolet (UV) Raman spectrum to find a better index of graphitization degree. The T peak (sp3 sites) of coal was first directly detected. The IT/IG and ID/IG decrease after pyrolysis in UV Raman spectra at 266 nm, which shows that the sp3 site relative content decreases and the sp2 site relative content increases. Moreover, the absolute value of the D band dispersion slopes as the excitation wavelength increases and the D peak width decreases, which shows that the coal gets more orderly after pyrolysis. The position difference (G–D) decreases and the G peak width increases after pyrolysis in UV–Vis Raman spectra, indicating the decomposition of vitrinite in coal. The 2D′ peak decreased after pyrolysis. These parameters in multi-wavelength Raman spectra can be used to evaluate the structure of coal.

中文翻译:

紫外拉曼光谱:评估煤热解石墨化的合理方法

拉曼光谱是评估碳材料石墨化程度的常用方法。但是,其对煤石墨化的评价还存在争议,即大的I D / I G是否意味着煤的石墨化程度高。这项工作使用紫外线(UV)拉曼光谱来找到更好的石墨化程度指标。首先直接检测到煤的T峰(sp 3位)。在266 nm的UV拉曼光谱中热解后,I T / I GI D / I G降低,这表明sp 3站点相对含量降低,sp 2站点相对含量增加。此外,随着激发波长的增加和D峰宽度的减小,D谱带色散的绝对值出现斜率,表明煤在热解后变得更有序。在UV-Vis拉曼光谱中热解后,位置差(G–D)减小,G峰宽增加,表明煤中的镜质石分解。热解后2D'峰降低。多波长拉曼光谱中的这些参数可用于评估煤的结构。
更新日期:2020-12-01
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