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摘要: 通过在固定床微反应器上对同时脱硫脱硝催化剂的研究，发现将V2O5担载在活性焦(AC)上制得的V2O5/AC催化剂可在200 ℃同时脱除烟气中的SO2和NO，其活性明显高于纯AC。V2O5/AC催化剂的脱硫脱硝活性与催化剂中钒的质量分数有关，随着V2O5质量分数从0.5%增至9%，硫容从3%增加到12%，脱硝率在V2O5质量分数为0.5%到3%时脱硝率稳定在60%左右，继续增加V2O5质量分数，脱硝率降低。程序升温脱附 (TPD) 和红外光谱 (FTIR) 表征结果显示在脱硫脱硝过程中，催化剂表面有H2SO4, 铵盐和VOSO4生成, VOSO4的质量分数随催化剂中V2O5质量分数的提高而升高。使用后的催化剂可通过5%NH3在300 ℃再生，再生后催化剂的脱硝活性明显增加，NO转化率从新鲜样的67%提高到接近100%，对SO2的吸附也比新鲜样有所增加。Abstract: To achieve the aim of simultaneous SO2 and NOx removal from flue gas in a fix bed at the temperature of about 200 ℃, a novel catalyst of V2O5/activated coke (AC) was investigated. The experimental results show that the SO2 and NO removal activity of V2O5/AC at 200 ℃ is higher than that of pure AC. The effect of V2O5 loading was investigated as well. The SO2 capacity increases from 3% to 12% as the V2O5 loading increases from 0.5% to 9%, and the NO conversion shows a fall trend with increasing the V2O5 loadings. Results from the temperature programmed desportion (TPD) and FTIR reveal that H2SO4, ammonium-sulfate salt and VOSO4 are generated on the catalyst during SO2 and NO removal. The VOSO4 content would increase with the increase of V2O5 loading. The used V2O5/AC is regenerated at 300 ℃ by 5%NH3/Ar. It is found that the regeneration significantly increases the selective catalytic removal activity of NO, and improves the SO2 removal activity to a certain extent.
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Key words:
- V2O5/AC catalyst
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