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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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固定床中纤维素热解及其焦油裂解机理研究
, PP. 414-419
Keywords: 纤维素,热解,焦油,机理,模拟
Abstract:
？研究了500~900℃条件下微晶纤维素在固定床中的热解过程；分别采用气质联用（gc-ms）和气相色谱分析了热解过程中生成的焦油和不可凝气体。结果表明，随热解温度升高，焦油产率减少、气体产率升高、焦产率略微下降，同时co、ch4和h2的产率明显升高，而co2的产率变化不明显。焦油主要由二次反应产生，不可凝气体则由一次热解产物和二次热解产物共同产生。使用gaussian09软件对热解过程进行了模拟，发现纤维素分子在热解过程中首先分解为纤维素单体，然后纤维素单体上的羟基官能团优先脱除，生成的中间产物重组生成焦油。随热解温度升高，焦油中醚、醇、酸等化合物分解成自由基，自由基间发生重组、结合，导致烯烃和炔烃增多以及不可凝气体含量的升高。
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