Understanding the stability of pyrolysis tars from biomass in a view point of free radicals
Understanding the stability of pyrolysis tars from biomass in a view point of free radicals
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从自由基的角度理解生物质热解焦油的稳定性
DOI：
10.1016/j.biortech.2014.01.063
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发表时间：
2014-03-01
影响因子：
11.4
通讯作者：
Liu, Muxin
中科院分区：
文献类型：
--
作者：
He, Wenjing;Liu, Qingya;Liu, Muxin
生物质的快速热解在世界范围内引起了越来越多的关注，以生产可升级为液体燃料和化学品的生物焦油。然而，生物焦油的质量和稳定性通常较差，难以升级。为了更好地了解生物焦油的性质，这项工作揭示了两种生物质热解产生的焦油的自由基浓度。结果表明，焦油中含有大量的自由基，在573K或更高的温度下能产生更多的自由基，在673K下不到30min就能达到1019Spin/g的水平。焦油样品中自由基的产生归因于四氢呋喃不溶物(焦炭)的形成，焦炭中也含有自由基。对热解过程中得到的水溶液的自由基浓度也进行了研究。(C)2014爱思唯尔有限公司。保留所有权利。
Fast pyrolysis of biomass has attracted increasing attention worldwide to produce bio-tars that can be upgraded into liquid fuels and chemicals. However, the bio-tars are usually poor in quality and stability and are difficult to be upgraded. To better understand the nature of the bio-tars, this work reveals radical concentration of tars derived from pyrolysis of two kinds of biomass. The tars were obtained by condensing the pyrolysis volatiles in 3 s. It shows that the tars contain large amounts of radicals, at a level of 10(16) spins/g, and are able to generate more radicals at temperatures of 573 K or higher, reaching a level of 10(19) spins/g at 673 K in less than 30 min. The radical generation in the tar samples is attributed to the formation of THF insoluble matters (coke), which also contain radicals. The radical concentrations of the aqueous liquids obtained in pyrolysis are also studied. (C) 2014 Elsevier Ltd. All rights reserved.