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›› 2007, Vol. 7 ›› Issue (6): 1107-1113.

• 过程与工艺 • 上一篇    下一篇

喷动-载流床中Co/ZSM-5分子筛催化剂对煤热解的催化作用

邹献武,姚建中,杨学民,宋文立,林伟刚   

  1. 中国科学院过程工程研究所多相复杂系统国家重点实验室
  • 出版日期:2007-12-20 发布日期:2007-12-20

Effect of Co/ZSM-5 Zeolite Catalyst on Pyrolysis of Coal in a Spouted Fluidized Bed

ZOU Xian-wu,YAO Jian-zhong,YANG Xue-min,SONG Wen-li,LIN Wei-gang   

  1. State Key Laboratory of Multi-phase Complex System, Institute of Process Engineering, Chinese Academy of Sciences
  • Online:2007-12-20 Published:2007-12-20

摘要: 在喷动-载流床中考察了Co/ZSM-5分子筛催化剂对煤热解气、液、固产物产率及组成变化的影响,分析了催化剂失活的原因及催化剂的再生使用寿命. 结果表明,在550~600℃的热解温度范围内,Co/ZSM-5分子筛催化剂提高煤热解总转化率达70%以上. 而在650℃时,煤热解正己烷可溶物产率最大,其中酚类、脂肪烃类和芳香烃类的产率比无催化剂时分别增加203%, 51%和78%. 因积碳失活的Co/ZSM-5分子筛催化剂经过500℃焙烧后再生使用6次,活性下降不到5%. Co/ZSM-5分子筛催化剂的结构表征结果说明,Co进入了ZSM-5分子筛骨架. Co的催化加氢活性促进了H·与煤热解焦油片断的结合,减少了焦油聚合成大分子的几率,从而提高了煤热解油品的产率和品质.

关键词: 喷动-载流床, Co/ZSM-5分子筛, 煤热解, 催化

Abstract: The effect of Co-doped zeolite catalyst, Co/ZSM-5, on the yields and compositions of gas, liquid and solid products from coal pyrolysis was investigated in a spouted fluidized bed. Moreover, the mechanism of Co/ZSM-5 zeolite deactivation and regeneration life was also studied. The results showed that the total conversion rate of coal pyrolysis could be increased by 70% from 550℃ to 600℃ with Co/ZSM-5 zeolite. However, the yields of hexane soluble matters were highest at 600℃. In the hexane soluble matters, the yields of phenol, aliphatic and aromatic groups could be increased up to 203%, 51% and 78%, respectively, at 650℃ with Co/ZSM-5 zeolite. Poisoned Co/ZSM-5 zeolite from carbon deposition could be regenerated by roasting at 500℃, and the reduction of Co/ZSM-5 zeolite activity was less than 5% after 6 regeneration times. The results of catalyst characterization indicated that the cobalt was introduced into ZSM-5 zeolite. Because of its catalytic activity in hydrogenation, cobalt can promote the combination of H· with tar fraction from coal pyrolysis, which decreases the rates of tar fractions forming macromolecule. Therefore, the yield and quality of tar from coal pyrolysis can be improved.

Key words: spouted fluidized bed, Co/ZSM-5 zeolite, coal pyrolysis, catalysis