The role of different nitrogen functional groups on the removal of SO2 from flue gases by N-doped activated carbon powders and fibres
The role of different nitrogen functional groups on the removal of SO2 from flue gases by N-doped activated carbon powders and fibres
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DOI：
10.1016/s0008-6223(03)00180-5
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发表时间：
2003-01-01
期刊：
影响因子：
10.9
通讯作者：
Linares-Solano, A
中科院分区：
文献类型：
--
作者：
Raymundo-Piñero, E;Cazorla-Amorós, D;Linares-Solano, A
碳质材料从烟道气中去除SO2取决于它们在O-2或O-2和蒸汽存在下作为催化剂将SO2氧化为SO3或H2SO4的行为。以往的研究表明，氮(N)官能团是SO2吸附氧化的活性位点，但活性较高的N基团的性质尚未确定。为此，本研究采用不同的方法制备了掺杂N原子的活性炭（AC）和活性炭纤维（ACF）。用XPS评价了这N个类群的数量和性质。所制备的材料含氮量范围广，分布在不同的化学物质中。通过这种方法，我们可以确定N含量的影响以及不同含N官能团对SO2氧化催化活性的作用。结果证实，虽然孔体积和孔径分布对催化活性影响较大，但表面N种的存在增加了催化活性。他们还证明，在不同的N官能团中，吡啶氮是该反应中最活跃的。(C) 2003 Elsevier Ltd.版权所有。
SO2 removal from flue gases by carbonaceous materials is determined by their behaviour as catalysts for SO2 oxidation into SO3 or H2SO4 in the presence of O-2 or O-2 and steam, respectively. Previous studies have demonstrated that nitrogen (N) functional groups are active sites for the adsorption and oxidation of SO2, although the nature of the N groups with the higher activity had not been established yet. For this reason, in the present work a number of activated carbons (AC) and activated carbon fibres (ACF) doped with N atoms have been prepared using different methods. The number and nature of these N groups have been assessed by XPS. The materials prepared have a wide range of nitrogen content, which is distributed into different chemical species. In this way, we were able to determine the effect of the N content and the role of the different N-containing functional groups on the catalytic activity for SO2 oxidation. The results confirm that, although the pore volume and the pore size distribution strongly influence the catalytic activity, the presence of N species at the surface increases the catalytic activity. They also demonstrate that, among the different N functional groups, pyridinic nitrogen is the most active for this reaction. (C) 2003 Elsevier Ltd. All rights reserved.