Exploring a new way to generate mesopores in lignite by employing steam explosion
Exploring a new way to generate mesopores in lignite by employing steam explosion
复制标题
探索蒸汽爆破褐煤中孔生成新途径
DOI：
10.1080/15567036.2019.1630036
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发表时间：
2021-03-04
影响因子：
2.9
通讯作者：
He, Qiongqiong
中科院分区：
文献类型：
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作者：
Miao, Zhenyong;Pei, Zhen;He, Qiongqiong
摘要当前，煤炭的物质利用越来越受到重视。本研究采用蒸汽爆破法扩大褐煤的孔结构，以提高其吸附能力。首先，褐煤在493K的温度下用水蒸气蒸煮，10min后，在0.0875 S内完成水蒸气的释放，形成突然爆炸，将热能转化为机械能。为了全面描述褐煤在SE过程中孔隙的变化，采用了MIP和BET两种测量方法。结果表明，SE极大地促进了煤中介孔的生成，在6~12 nm范围内孔洞的增加非常明显。MD褐煤和SL褐煤的中孔体积分别增加了31倍和19倍。此外，SE后煤的微孔也比原煤增加了3倍以上。红外光谱重叠峰曲线的拟合表明，褐煤在SE过程中羧基和氢键的变化是有限的，且大部分的极性中心可以保持。总体而言，SE有可能用于制备对大分子有机污染物的煤基吸附剂。
ABSTRACT Currently, the material utilization of coal is attracting more attention. In this study, the steam explosion (SE) was applied to enlarge the pore structure of lignite to improve its adsorption ability. Firstly, the lignite coal was cooked by steam at the temperature of 493 K and 10 min later, the steam release was completed within 0.0875 s to form suddenly explosion, which conversed the thermal energy into mechanical energy. To fully describe the changes of pores in lignite during SE, both of MIP and BET measurement methods were applied. It shows that SE can greatly facilitate the generation of mesopores in coal, and the increasing amounts of pores in the range of 6 ~ 12 nm were quite apparent. The total volumes of mesopores in MD and SL lignite were sharply increased by 31 and 19 times, respectively. Besides, the micropores were also increased more than three times of raw coal after SE. Based on the curve-fitting of overlapped peaks in FTIR spectra, it shows that the changes in carboxyl and hydrogen bonds of lignite coal during SE were limited, and most of these polar sites can be maintained. Overall, SE has the potential to be used to prepare the coal-based adsorbent for the organic pollutants with large molecular weight.