文献类型：期刊文献

英文题名：Pitch spheres stabilized by HNO₃ oxidation and their carbonization behavior

作者：Liu Xiao-jun[1];Liang Xiao-yi[1];Liu Chao-jun[1];Zhang Rui[1];Zhang Liang[1];Qiao Wen-ming[1];Ling Li-cheng[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2010

卷号：25

期号：1

起止页码：29

外文期刊名：NEW CARBON MATERIALS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000274776800005)】；

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

语种：英文

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

摘要：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 carbonized 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 degrees C to produce carbonized spheres without any change in shape. The successful carbonization call 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 degrees C the transformation of -NO2 groups to amine group occurred, which promoted the cross-linking, of pitch molecules. As the pitch spheres were carbonized at 900 degrees C, cyclization and aromatization reactions led to the formation of pyridine and quaternary nitrogen groups.