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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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超临界水中煤基多孔炭孔隙形成过程的研究
, PP. 1025-1031
Keywords: 超临界水,褐煤,多孔炭,萃取,热解,气化
Abstract:
？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。
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