| 乔玉洁,龚蕾,董世城,王辉.CO2对Fe2O3催化剂NH3-SCR脱硝性能影响[J].,2023,63(5):479-485 |
| CO2对Fe2O3催化剂NH3-SCR脱硝性能影响 |
| Effect of CO2 on NH3-SCR denitrification performance of Fe2O3 catalyst |
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| DOI：10.7511/dllgxb202305006 |
| 中文关键词:NH3-SCR吸附行为CO2Fe2O3 |
| 英文关键词:NH3-SCRadsorption behaviorCO2Fe2O3 |
| 基金项目:国家自然科学基金资助项目(2180601721876019). |
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| 摘要点击次数:90 |
| 全文下载次数:143 |
| 中文摘要: |
| 考虑到CO2是固定源和移动源废气中的主要组分，Fe2O3是铁基催化剂中的重要活性物质，研究了CO2对Fe2O3催化剂NH3-SCR脱硝性能的影响．结果表明，CO2的加入在300 ℃以下明显抑制了催化剂的NH3-SCR性能．这主要是因为CO2的存在改变了催化剂表面NH3/NOx的吸附行为，从而影响了NH3-SCR反应．原位漫反射傅里叶变换红外光谱和程序升温脱附实验结果表明，CO2可以被吸附活化成碳酸盐物种；这些碳酸盐物种可以作为新的酸性位点吸附NH3物种，促进催化剂对NH3的吸附；但同时CO2和NOx之间存在竞争吸附，这会导致催化剂表面生成的关键NO2物种和硝酸盐物种的减少，从而抑制NH3-SCR反应． |
| 英文摘要: |
| Considering that CO2 is the main component of exhaust gases which come from stationary and mobile source and Fe2O3 acting as an essential active substance exists in iron-based catalysts, the effect of CO2 on NH3-SCR denitrification performance of Fe2O3 catalyst is investigated. The results show that the addition of CO2 significantly impedes the NH3-SCR performance below 300 ℃. This is mainly because the presence of CO2 changes the adsorption behavior of NH3/NOx on the catalyst surface, which further affects the NH3-SCR reaction. The results of in situ DRIFTS and TPD experiments show that CO2 could be adsorbed and activated to form carbonate species, which may act as new acidic sites to adsorb NH3 species and therefore promote ad-NH3 species on the catalyst. However, the competitive adsorption between CO2 and NOx leads to a reduction in the production of key NO2 species and nitrate species on the catalyst surface and thus the NH3-SCR reaction is inhibited. |
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