超临界水中煤基多孔炭孔隙形成过程的研究

周娴娴; 曲旋; 张荣; 毕继诚

超临界水中煤基多孔炭孔隙形成过程的研究

周娴娴^1,2,
曲旋¹,
张荣¹,
毕继诚^1,

1.
中国科学院山西煤炭化学研究所煤转化国家重点实验室, 山西太原 030001;
2.
中国科学院大学, 北京 100049

基金项目: 国家高技术研究发展计划(863计划, 2011AA05A201)。

详细信息

通讯作者:
毕继诚,E-mail:bijc@sxicc.ac.cn。

中图分类号: TQ536.1
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- 文章访问数: 454
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- 被引次数: 0
出版历程
- 收稿日期: 2015-05-19
- 修回日期: 2015-07-06
- 刊出日期: 2015-09-30

Pore evolution of coal based porous carbon in supercritical water

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
2.
University of Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 在半连续超临界水反应器(SCWR)中考察了不同温度、反应时间下昭通褐煤的转化特性,结合半焦有机官能团及碳微晶结构分析,推测在超临界水中半焦孔隙的形成过程以及煤中矿物质的作用。结果表明,超临界水首先快速萃取出褐煤热解产物,促进了半焦石墨化,形成良好的炭素前驱体,此过程对半焦孔结构基本无作用;当温度高于550 ℃,炭素前驱体发生气化反应,产生了较多的C-O-C交联结构,比表面积明显提高,逐渐形成多孔炭材料;脱灰后的煤在升温过程中具有更高的萃取率,形成有利于微孔产生的炭素前驱体,煤中的矿物质更有利于中孔的形成。
- 超临界水 /
- 褐煤 /
- 多孔炭 /
- 萃取 /
- 热解 /
- 气化
Abstract: The influences of temperature, time, and mineral matter on conversion of lignite in a semi-continuous supercritical water reactor (SCWR) were investigated. The evolution of pore during reaction in SCWR was deduced with Fourier transform infrared and Raman spectra characterization. It is found that supercritical water can quickly extract the volatile from coal under low temperature, which promotes char graphitization and formation of carbon precursor. When temperature is above 550 ℃, more C-O-C cross-linking structures are formed, accompanied by a significant increase of surface area. The extraction yield of deashed coal is relatively high during pyrolysis process and more micropores are formed compared with raw coal. Furthermore, mineral matter in coal promotes the formation of mesopore.
- supercritical water /
- lignite /
- porous carbon /
- extraction /
- pyrolysis /
- gasification

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