The role of different nitrogen functional groups on the removal of SO2 from flue gases by N-doped activated carbon powders and fibres
✍ Scribed by E. Raymundo-Piñero; D. Cazorla-Amorós; A. Linares-Solano
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 212 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0008-6223
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✦ Synopsis
SO removal from flue gases by carbonaceous materials is determined by their behaviour as catalysts for SO oxidation 2 2 into SO or H SO in the presence of O or O and steam, respectively. Previous studies have demonstrated that nitrogen 3 2 4 2 2
(N) functional groups are active sites for the adsorption and oxidation of SO , although the nature of the N groups with the 2 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 SO oxidation. The results confirm that, although 2 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.