Pore structure of carbons coated on ceramic particles
Pore structure of carbons coated on ceramic particles
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DOI：
10.1016/j.carbon.2004.07.029
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发表时间：
2004-01-01
期刊：
影响因子：
10.9
通讯作者：
Tryba, B
中科院分区：
文献类型：
--
作者：
Inagaki, M;Kobayashi, S;Tryba, B
研究了陶瓷基体（MgO、TiO_2和不同相的Al_2 O_3）和碳前驱体（聚乙烯醇（PVA）、聚对苯二甲酸乙二酯（PET）和羟丙基纤维素（HPC））对碳包覆陶瓷颗粒孔结构的影响。通过溶解基底MgO颗粒，发现碳包覆的MgO颗粒具有高于1000 m2/g的高BET表面积，这与在基底的零表面积假设下从碳包覆的MgO颗粒上测量的表观表面积估计的值几乎相同。通过密度泛函方法和α（s）图分析，发现分离出的碳富含微孔。对于三种碳前体，BET表面积对涂覆在具有高表面积的TiO 2上的碳的量的依赖性是相同的，尽管来自前体的碳产率略有不同。多孔Al_2 O_3基体，γ-Al_2 O_3和在碳化过程中由Al（OH）（3）形成的γ-Al_2 O_3，给出了高的BET表面积，但致密Al_2 O_3，α-Al_2 O_3，给出了低的表面积。(C)2004 Elsevier Ltd.保留所有权利。
Pore structure of carbon coated on ceramic particles by carbonization of precursor in a powder mixture at 900degreesC was studied by focusing on the effects of substrate ceramics (MgO, TiO2 and various phases of Al2O3) and of carbon precursor (poly(vinyl alcohol) (PVA), poly(ethylene terephthalate) (PET) and hydroxyl propyl cellulose (HPC)). By dissolving substrate MgO particles, carbon coated was found to have a high BET surface area, more than 1000m(2)/g, which was almost the same as the value estimated from apparent surface area measured on carbon-coated MgO particles under the assumption of zero surface area of the substrate. The carbon separated was found to be rich in micropores from the analyses by DFT method and alpha(s) plot. The dependence of the BET surface area on the amount of carbon coated on TiO2 with a high surface area was the same for three carbon precursors, although the carbon yields from the precursors were slightly different. Porous Al2O3 substrates, gamma-Al2O3 as-received and that formed from Al(OH)(3) during carbonization, gave a high BET surface area, but dense Al2O3, alpha-Al2O3, gave a low surface area. (C) 2004 Elsevier Ltd. All rights reserved.