《Table 5 Che mical shifts and assignme nt of re sonance s in13C NMR spe ctrum[14, 15]》

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《固定床渣油加氢脱金属废催化剂上焦炭结构和组成沿床层变化研究（英文）》

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In view of the low resolution of solid state13C NM R，the spectral peaks of different functional groups should overlap and form a w ide peak，and thus it is needed to unpack the overlapping peak and fit the spectrum w ith Origin Softw are.Figure 4（b）is the result of peak separation and fitting of HDM 1.The belonging of each chemical shifts[13，14]is listed in Table 5.