Activated carbons from bituminous coal: effect of mineral matter content
Activated carbons from bituminous coal: effect of mineral matter content
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DOI：
10.1016/s0016-2361(99)00184-2
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发表时间：
2000-05
期刊：
影响因子：
7.4
通讯作者：
Á. Linares-Solano;I. Martín-Gullón;C. S. M. Lecea;B. Serrano-Talavera
中科院分区：
文献类型：
--
作者：
Á. Linares-Solano;I. Martín-Gullón;C. S. M. Lecea;B. Serrano-Talavera
在前人研究的基础上，选择了西班牙Puertollano盆地的烟煤作为最合适的原料前驱体制备活性炭。事实上，这种煤在10种不同的西班牙煤中给出了最好的结果，这些煤覆盖了广泛的煤等级。在煤矿设施中，通过不同强度的液压-气动洗选，降低了其初始灰分（19wt%），得到了12%和8wt%灰分。原煤经HCl/HF洗涤处理，灰分为5wt%，得到另一馏分。这四种煤在850°C下碳化，并在850°C的蒸汽和二氧化碳中进行不同活化时间的活化，以分析灰分水平对所得碳孔隙度发展的影响。与预期相反（催化作用、孔隙堵塞和适当孔隙发育障碍），初始灰分水平不影响孔隙发育。灰分较低（燃烧程度相同）的样品产生较高的微孔体积。但当结果以干无灰基表示时，无论初始灰分水平如何，孔隙度的发展都是相同的。比较蒸汽和二氧化碳作为活化剂的行为，得到的孔隙结构和孔隙体积非常相似，尽管蒸汽样品的孔隙尺寸略大于二氧化碳样品。实验吸附等温线采用Dubinin-Stoeckli方程，对活化过程中各反应气体孔隙度的变化进行了分析。
A bituminous coal from Puertollano Basin (Spain) was selected on the basis of previous study as the most suitable raw precursor to prepare activated carbons. In fact, this coal gave the best results among a total of 10 different Spanish coals that covered a wide range of coal rank. Its initial ash level (19wt%) was decreased in the coal mine facilities by different intensive hydropneumatic washing, yielding fractions with 12 and 8wt% ash. Another fraction was also obtained from the original coal with 5wt% ash by an HCl/HF washing treatment. These four coals were carbonised at 850°C and activated at 850°C for different activation times in steam and carbon dioxide, to analyse the effect of ash level on the porosity development of the resulting carbons. Contrary to what might be expected (catalysis effect, pore blocking and impediment of suitable porosity development), the initial ash level does not affect the porosity development. Those samples with a lower ash (at the same burn-off degree) yield higher micropore volumes. But when the results are presented in terms of dry ash free basis, the same porosity development is attained regardless of the initial ash level. Comparing the behaviour of steam and carbon dioxide as activating agents, the pore structure and pore volumes attained are quite similar, though the pore sizes of steam samples are slightly wider than those of carbon dioxide samples. The Dubinin–Stoeckli equation applied to experimental adsorption isotherm was used to follow the porosity development during activation for each reactive gas.