摘要
采用XPS和Ar^+离子刻蚀技术,研究了炭化过程中铁原子在煤和聚丙烯腈表面和体相间的质量分布规律.结果发现.随炭化进行铁原子由表面向体相迁移和富集;炭化温度升高.迁移和富集增加.表面浓度逐渐降低.以致铁原子沿粒子径向呈浓度梯度分布.
The mass distrbution of iron atom between the surface and bulk of polyacrylonitrile and coal during their carbonization was studied by using XPS and Ar- ion etching techniques. It is found that iron atoms migrate and enrich from the surface to bulk during the carbonization of polyacrylonitrile and coal. and that the higher the carbonization temperature, the more the migration and enrichment. This results in a concentration ladder distribution of iron atoms along the direction of the particle diameter. There is a lower concentration of iron atom on the surface.
出处
《环境化学》
CAS
CSCD
北大核心
1997年第4期295-299,共5页
Environmental Chemistry
基金
国家自然科学基金
山西煤化所所长基金的资助
关键词
铁原子
聚丙烯腈
表面
体相间
质量转移
煤
炭化
coal char, polyacrylonitrile, iron catalyst, XPS, Ar+ ion etching.
