Liquid-phase adsorption of multi-ring thiophenic sulfur compounds on carbon materials with different surface properties.
Liquid-phase adsorption of multi-ring thiophenic sulfur compounds on carbon materials with different surface properties.
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DOI：
10.1021/jp0550210
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发表时间：
2006-02
期刊：
影响因子：
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通讯作者：
Anning Zhou;Xiaoliang Ma;C. Song
中科院分区：
文献类型：
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作者：
Anning Zhou;Xiaoliang Ma;C. Song
本文研究了碳材料的结构和表面性质对苯并噻吩（BT）、二苯并噻吩（DBT）、4-甲基二苯并噻吩（4-MDBT）和4，6-二甲基二苯并噻吩（4，6-DMDBT）在模拟柴油中硫化物的液体烷烃中的吸附的影响。平衡吸附容量变化很大，从1.7到7.0 mg-S/g-A。结果表明，不同的炭材料具有显着不同的硫吸附容量和选择性，这不仅取决于织构结构，而且还取决于表面官能团。多环硫化物在炭材料上的吸附符合Langmuir吸附等温式。通过对炭材料的吸附性能测试和BET、XPS表征，发现炭材料表面的含氧官能团对提高炭材料的硫吸附能力起着重要作用。无论炭材料类型如何，炭材料对各种化合物的吸附选择性趋势均按BT <萘< 2-甲基萘< DBT < 4-MDBT <4，6-DMDBT的顺序增加。硫化合物的这种选择性趋势与以前观察到的镍基吸附剂的吸附明显不同，几乎相反。废活性炭的再生也通过溶剂洗涤进行。对甲基DBT的高吸附容量和选择性表明，某些活性炭是有前途的选择性吸附脱硫（SARS）吸附剂，作为柴油超深度脱硫的新方法。
This work examines the effects of structural and surface properties of carbon materials on the adsorption of benzothiophene (BT), dibenzothiophene (DBT), 4-methyldibenzothiophene (4-MDBT) and 4,6-dimethyl-dibenzothiophene (4,6-DMDBT) in the presence of 10 wt % of aromatics in liquid alkanes that simulate sulfur compounds in diesel fuels. The equilibrium-adsorption capacity varies significantly, from 1.7 to 7.0 mg-S/g-A. The results show that different carbon materials have significantly different sulfur-adsorption capacities and selectivities that depend not only on textural structure but also on surface functional groups. The adsorption of multi-ring sulfur compounds on carbon materials was found to obey the Langmuir isotherm. On the basis of adsorption tests and the characterization of carbon materials by BET and XPS, the oxygen-containing functional groups on the surface appear to play an important role in increasing sulfur-adsorption capacity. The adsorption-selectivity trend of the carbon materials for various compounds increases in the order of BT < naphthalene < 2-methylnaphthalene < DBT < 4-MDBT < 4,6-DMDBT, regardless of carbon material types. This selectivity trend for sulfur compounds is dramatically different and almost opposite from that previously observed for adsorption over nickel-based adsorbents. The regeneration of spent activated carbons was also conducted by solvent washing. The high-adsorption capacity and selectivity for methyl DBTs indicate that certain activated carbons are promising adsorbents for selective adsorption for removing sulfur (SARS) as a new approach to ultra deep desulfurization of diesel fuels.