摘要
采用一种新型的活化技术———超临界水活化(650℃,32Pa)和传统的水蒸气活化(800℃)来制备活性炭。用氮气吸附法表征活性炭样品的孔结构,在差热/热重分析仪上考察了原料的热失重行为,对比研究了超临界水和水蒸气活化对酚醛树脂基活性炭孔结构的影响,并探讨了酚醛树脂基炭的炭化程度对活性炭孔结构的影响。研究结果表明:(1)超临界水活化有益于中孔的发展,而水蒸气活化有益于微孔的发展。(2)炭化程度较低的酚醛树脂基炭,在较低的活化烧蚀率时就能得到高比表面积和较高中孔率的活性炭。
A new activation method, supercritical water activation (650 degrees C, 32 Pa), and a traditional method, steam activation (650 degrees C), were used to prepare phenolic resin based activated carbons. Based on pore structure characterization of the samples by nitrogen adsorption and weight loss behavior of the starting materials by TG/DSC analysis, the effects of the two different activation methods and the degree of carbonization of the starting materials on the evolution of the pore structure of phenolic resin-based activated carbons were obtained. Results show that: (1) supercritical water activation benefits the development of mesoporosity, while steam activation benefits the development of microporosity; (2) activated carbons with high specific surface area and mesoporosity were obtained at a low degree of burn-off from phenolic resin-based carbons carbonized to a low degree.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2005年第2期122-128,共7页
New Carbon Materials
基金
国家自然科学基金(50172028)~~
关键词
活性炭
超临界水活化
水蒸气活化
孔结构
activated carbon
supercritical water activation
steam activation
pore structure
