Ordered mesoporous carbons: Implication of surface chemistry, pore structure and adsorption of methyl mercaptan
Ordered mesoporous carbons: Implication of surface chemistry, pore structure and adsorption of methyl mercaptan
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DOI：
10.1016/j.carbon.2005.02.035
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发表时间：
2005-08
期刊：
影响因子：
10.9
通讯作者：
D. Kim;H. Lee;J. Yie;Seung-jai Kim;Ji Man Kim
中科院分区：
文献类型：
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作者：
D. Kim;H. Lee;J. Yie;Seung-jai Kim;Ji Man Kim
将填充在SBA-15介孔孔道中的蔗糖在600°C（OMC-600）、850°C（OMC-850）和1100°C（OMC-1100）三种不同温度下热解，然后将二氧化硅基质溶解在氢氟酸中，制备了三种有序介孔碳材料（OMC）。利用XRD、氮气吸附、FTIR、碳表面pH值和Boehm滴定法分析了OMC材料的孔结构和表面特征。热解温度的增加导致表面pH值的增加，但酸性表面基团的量减少。随着热解温度从600°C增加到850°C，表面积和微孔和中孔体积增加，但在850°C以上这些性质没有显著变化。采用固定床动态吸附法，研究了甲基氯仿在OMC材料上的吸附特性。结果表明，OMC的孔结构和表面化学性质对甲基氯仿的吸附有很大的影响。
Three ordered mesoporous carbon materials (OMC) were prepared by pyrolysis of sucrose filled in the mesoporous channels of SBA-15 at three different temperatures of 600°C (OMC-600), 850°C (OMC-850) and 1100°C (OMC-1100), and followed by dissolution of the silica matrix in hydrofluoric acid. The pore structures and surface characteristics of the OMC materials were evaluated using XRD, nitrogen adsorption, FTIR spectroscopy, pH of carbon surface, and the amount of acidic surface groups from Boehm titration, respectively. The increase of the pyrolysis temperature resulted in an increase in surface pH, but a decrease in the amount of acidic surface groups. The surface area and micro- and mesopore volumes increased by increasing the pyrolysis temperature from 600°C to 850°C, but there were no significant changes in these properties above 850°C. In this paper, adsorption characteristics of methyl mercaptan on the OMC materials were studied using a dynamic adsorption method in a fixed bed. The results showed that the adsorption of methyl mercaptan was strongly influenced by pore structure and surface chemistry of the OMC.