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首页> 外文期刊>RSC Advances >Effects of oxygen functional groups and FeCl3 on the evolution of physico-chemical structure in activated carbon obtained from Jixi bituminous coal
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Effects of oxygen functional groups and FeCl3 on the evolution of physico-chemical structure in activated carbon obtained from Jixi bituminous coal

机译：氧官能团和FeCl3对鸡西烟煤活性炭理化结构演变的影响

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It is crucial to increase the values of S _(BET) /burn-off ratio to achieve activated carbon (AC) with a higher SO _(2) adsorption capacity at a low cost from flue gas. In this study, at first, Jixi bituminous coal was used as a raw material to prepare a series of pre-treated samples by oxidation treatment and adding different amounts of the FeCl _(3) catalyst. Then, the AC samples were prepared by pyrolysis under a N _(2) atmosphere and physical activation with CO _(2) . Finally, the change in the physico-chemical structure of different samples was determined to study the effects of oxygen functional groups and FeCl _(3) . The results show that the rapid growth of mesopores is mainly influenced by the evolution of oxygen functional groups, whereas the micropores are mainly influenced by the FeCl _(3) catalyst during pyrolysis. These effects can also further improve the size and the carbon type of the aromatic structure from a different perspective to promote the disordered microstructure of treated chars (1FeJXO15-800H, 3FeJXO15-800H and 6FeJXO15-800H) as compared to the ordered microstructure and less pores of the un-pretreated char (JX-800). Then, the active sites can no longer be consumed preferentially in the presence of the catalyst; this results in the continuous disordered conversion of the microstructure as compared to the ordered conversion of JX-800 char during activation. On the one hand, the developed initial pores of 1FeJXO15-800H, 3FeJXO15-800H, and 6FeJXO15-800H chars promote the favorable diffusion of activated gas, following the non-hierarchical development. On the other hand, the presence of Fe-based catalysts facilitates the etching of carbon structure and the rapid and continuous development of the micropores, hindering the severe carbon losses on the particle surface. Finally, the 3FeJXO15-800H char with a high value of S _(BET) (1274.64 m ~(2) g ~(?1) ) at a low burn-off value (22.5%) has the highest S _(BET) /burn-off ratio value of 56.65 m ~(2) g ~(?1) /%, whereas the JX-800 char with a low value of S _(BET) (564.19 m ~(2) g ~(?1) ) at a burn-off value of 58.2% has the lowest S _(BET) /burn-off ratio value of 9.69 m ~(2) g ~(?1) /%. Therefore, the presence of oxygen functional groups and FeCl _(3) has obviously changed the evolution of the physico-chemical structure in activated carbon to effectively enhance the values of S _(BET) /burn-off.
机译：至关重要的是增加S_（BET）/燃尽比的值，以低成本从烟道气中获得具有更高SO_（2）吸附容量的活性炭（AC）。在本研究中，首先，以鸡西烟煤为原料，通过氧化处理并添加不同量的FeCl_（3）催化剂制备了一系列预处理样品。然后，通过在N _（2）气氛下热解并用CO _（2）物理活化来制备AC样品。最后，确定不同样品的理化结构的变化，以研究氧官能团和FeCl_（3）的影响。结果表明，介孔的快速生长主要受氧官能团的演化影响，而微孔主要受热解过程中的FeCl_（3）催化剂影响。与有序的微结构和更少的孔相比，这些效果还可以从不同的角度进一步改善芳族结构的尺寸和碳类型，从而促进处理后的炭（1FeJXO15-800H，3FeJXO15-800H和6FeJXO15-800H）的无序微观结构。未预处理的炭（JX-800）。然后，在催化剂的存在下，活性位点不再能够被优先消耗。与活化过程中JX-800炭的有序转化相比，这导致了微观结构的连续无序转化。一方面，随着非分层的发展，发达的1FeJXO15-800H，3FeJXO15-800H和6FeJXO15-800H炭的初始孔促进了活性气体的良好扩散。另一方面，铁基催化剂的存在促进了碳结构的蚀刻以及微孔的快速和连续发展，从而阻碍了颗粒表面上严重的碳损失。最终，具有高S _（BET）（1274.64 m〜（2）g〜（？1））的S_（BET）值高的3FeJXO15-800H炭具有最高的S _（BET）。 /燃尽比值为56.65 m〜（2）g〜（？1）/％，而JX-800焦炭的S_（BET）值低（564.19 m〜（2）g〜（？1） ））在燃尽值为58.2％时具有最低的S _（BET）/燃尽比值为9.69 m〜（2）g〜（？1）/％。因此，氧官能团和FeCl_（3）的存在明显改变了活性炭中理化结构的演变，从而有效地提高了S_（BET）/燃尽值。

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