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载铁煤焦中铁化学形态的研究 被引量:4

STUDY OF IRON CHEMICAL FORMS IN IRON-LOADED COAL CHARS
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摘要 利用EXAFS、XANES和XRD方法对负载三氯化铁的煤半焦中铁化学形态进行了表征,并着重考察煤的性质和铁负载量对铁化学形态的影响。在600℃热解条件下,两种褐煤载铁半焦中铁主要以晶相Fe_3O_4存在,而烟煤载铁半焦中以Fe_3O_4、FeO和α-Fe混合物相存在。这可能源于烟煤中存在较少的含氧官能团和较多的固定碳。对于富含有机硫的煤,负载铁与其中有机硫化合物发生作用并在给定热解条件下形成Fe_(1-x)S。铁负载量在研究范围内对铁化学形态的影响较小。 EXAFS,XANES and XRD methods were used tO Characterize the iron species formed during pyrolysis of FeCl_3-loaded coals,paying a special attention to effects of coal properties and iron loading on the iron chemical forms. Under 600 ℃ pyrolysis condition,crystalline Fe_3O_4 is main form in two types of brown coal semichars, but a mixed phase consisting of Fe_3O-4,FeO and a fraction of a-Fe was observed in a bituminous coal semichar.It seems that there are less oxygen-containing functional groups and much more fixed carbons in bituminous coal than in brown coal.For the coal with high organic sulfur,there is a strong interaction between the loaded iron and the organic sulfur compounds,and Fe_(1-x)S formed under the pyrolysis condition.In the range of this studied,iron loading has a small effection on the iron chemical forms.
出处 《燃料化学学报》 EI CAS CSCD 北大核心 1996年第2期125-130,共6页 Journal of Fuel Chemistry and Technology
关键词 化学形态 XAFS XRD 铁催化剂 热解 coal char,loaded iron,chemical forms,XAFS,XRD
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参考文献3

  • 1朱珍平,燃料化学学报,1996年,24卷,1期,48页
  • 2朱珍平,8th International Conference on Coal Sci,1995年
  • 3原贻琼,硕士学位论文,1994年

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