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首页> 外文期刊>Industrial & Engineering Chemistry Research >Preparation of Activated Carbons from Bituminous Coals with CO_2 Activation. 1. Effects of Oxygen Content in Raw Coals
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Preparation of Activated Carbons from Bituminous Coals with CO_2 Activation. 1. Effects of Oxygen Content in Raw Coals

机译：CO_2活化法从烟煤制备活性炭。 1.原煤中氧含量的影响

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Activated carbons were prepared from three Australian bituminous coals in this study. The preparation process consisted of carbonization followed by activation in CO_2. Experimental results reveal that the oxygen content of the coals has a great influence on the behavior during preparation and on the properties of the products. The coal with a higher O/C atomic ratio has a lower peak temperature for volatile evolution during carbonization and is able to produce a char with a higher surface area. The reactivity in CO_2, the surface area, and the pore volume of the resulting activated carbon are all increasing functions of the O/C ratio of the coal precursors. An SEM study shows that at high burn-off levels a higher portion of gasification occurs at the exterior surface of the carbon from the coal with a lower O/C ratio, indicating that the diffusion resistance may be stronger for this carbon. For the same coal precursor, the average pore diameter of the activated carbon increases as the temperature for activation is increased in the range of 800-900℃.
机译：在这项研究中，活性炭由三种澳大利亚烟煤制备而成。制备过程包括碳化，然后在CO_2中活化。实验结果表明，煤中的氧含量对制备过程中的行为和产品的性能有很大的影响。具有较高O / C原子比的煤在碳化过程中具有较低的峰挥发峰温度，并且能够生产出具有较高表面积的炭。所得活性炭在CO_2中的反应性，表面积和孔体积均是煤前体的O / C比的增加函数。 SEM研究表明，在高燃尽水平下，具有较低O / C比的煤中碳的外表面会发生较大程度的气化，这表明该碳的扩散阻力可能更强。对于相同的煤前驱体，活性炭的平均孔径在800-900℃范围内随活化温度的升高而增加。

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