摘要
研究了炭化工况对木质素焦炭电阻率的影响,并结合拉曼光谱和XRD分析研究了温度和催化剂对焦炭结构和导电性能的影响.结果表明:炭化温度的提高和催化剂的添加有利于焦炭石墨化,即提高焦炭导电性能.添加催化剂需要采用两段炭化法以避免焦油对催化剂的中毒作用.随着温度的升高,拉曼光谱中D峰强度不断增加,产生的活性炭原子与焦炭中的灰分结合形成的离子络合物导致了电阻率的降低.添加催化剂使得D峰和G峰强度均有增加,说明催化剂可以促进焦炭的炭化和石墨化.镍基催化剂较容易使焦炭获得石墨化结构,在低温阶段催化效果明显.而铁基催化剂在高温下也可以体现出较强的催化能力.
The effect of carbonization conditions on resistivity of lignin char was studied and the influence of temperature and catalysts on the coke structure and electrical conductivity were analyzed by Raman spectroscopy and XRD. The results show that increasing carbonization temperature and adding catalysts improve the graphitization of char, which improves the conductivity of char. Two step carbonization method can avoid the catalysts being poisoned from tar. D peak intensity of Raman spectroscopy increases with temperature increasing, which means that the active carbon atoms produced may combine with ash to form ion complex and therefore leads to the decrease of resistivity. The intensity of D and G peaks increases with adding catalysts, which suggests that the catalysts promote the carbonization and graphitization. Adding Ni-catalyst is very helpful to the formation of graphite structure in char, and the effect is obvious in low temperature stage. The mechanism of Fecatalysts lies in oxygen transfer and cracking lignin, Fe-catalysts may present strong catalytic capability even at high temperature.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第1期115-119,共5页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(51276167)
国家重点基础研究发展计划(973计划)资助项目(2010CB732206)
浙江省自然科学基金资助项目(Y12E060029)
科技部国际科技合作技术交流专项资助项目(2011DFR60190)
关键词
拉曼光谱
导电炭
木质素
Raman spectra
conductive char
lignin
