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为深入探讨不同气氛下的热老化对碳烟表面各类官能团以及碳烟氧化特性的影响,首先,对柴油机碳烟进行热老化预处理;其次,通过热重试验和化学反应动力学计算分析不同热老化后碳烟的氧化特征;最后,通过傅里叶红外光谱分析和X-射线光电子能谱研究不同热老化后碳烟表面官能团分布规律和元素组成。结果表明,热老化后碳烟起燃温度和活化能明显增加,其中O
2
/NO
2
/N
2
气氛中热老化的碳烟起燃温度和活化能最低,分别为842.15 K和165.29 kJ·mol
-1
;热老化后碳烟表面碳氢官能团的支链化程度和含量下降,NO
2
参与热老化的碳烟表面碳氢官能团相对含量最高;热老化后的碳烟表面O元素含量下降,在O
2
/NO
2
/N
2
气氛下热老化的碳烟O/C摩尔比值最高为0.15;热老化后碳烟碳原子杂化程度降低且表面—C—OH和—C=O官能团含量均有所降低,热老化气氛中依次加入O
2
和NO
2
后的—C—OH官能团含量分别下降到0.21%及0.53%
而—C=O官能团含量分别增加至4.98%及5.98%。
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