文献类型：期刊文献

中文题名：沥青球的HNO_3氧化和炭化行为(英文)

英文题名：Pitch spheres stabilized by HNO_3 oxidation and their carbonization behavior

作者：刘小军[1];梁晓怿[1];刘朝军[1];张睿[1];詹亮[1];乔文明[1];凌立成[1]

机构：[1]华东理工大学化学_T程联合国家重点实验室,上海200237

年份：2010

卷号：25

期号：1

起止页码：29

中文期刊名：新型炭材料

外文期刊名：New Carbon Materials

收录：CSTPCD;;EI(收录号：20101512841665);Scopus;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：Nature Science Foundation of China (50672025);Science and Technology Commission of Shanghai Municipality (065258033,06DZ22003)~~

语种：中文

中文关键词：沥青;氧化;炭化;FT-IR;HNO3

外文关键词：Pitch; Oxidation; Carbonization; FT-IR; HNO3

摘要：在室温条件下,以不同浓度的HNO3溶液(质量分数分别为10,20,30 and 40%)为氧化介质处理沥青球,而后直接进行高温炭化处理,利用FT-IR、XPS、SEM和元素分析表征HNO3氧化沥青球及其炭化样的化学结构和表面形貌。结果表明:用30%HNO3氧化12h的沥青球在900℃高温炭化后能够保持良好的球形度和表面形貌;HNO3处理引入的-NO2官能团在400℃前转化为胺基,促进了沥青分子的交联,保证了沥青球炭化过程的顺利进行;当炭化温度为900℃时,胺基进一步发生了环化和芳构化反应,氮原子以吡啶氮和季氮形式存在。
Pitch spheres were stabilized by HNO3 oxidation at room temperature using HNO3 solutions of 10,20,30,and 40% mass fraction. The chemical structure and morphology changes of the oxidized pitch spheres and their carbo￣nized samples were investigated by FT-IR,XPS,elemental analysis,and SEM. Results showed that the pitch spheres oxidized by 30% HNO3 for 12 h could be carbonized at 900 ℃ to produce carbonized spheres without any change in shape. The successful carbonization can be ascribed to the contribution of nitrogen functional groups in the form of -NO2,which were introduced in the HNO3 oxidation process. In the early stage of the heat treatment around 400 ℃,the transformation of -NO2 groups to amine groups occurred,which promoted the cross-linking of pitch molecules. As the pitch spheres were carbonized at 900 ℃,cyclization and aromatization reactions led to the formation of pyridine and quaternary nitrogen groups.