SO_(2)对掺杂KMnO_(4)的K_(2)CO_(3)/Al_(2)O_(3)吸附剂脱碳性能影响

Effect of SO_(2) on Decarbonization Performance of K_(2)CO_(3)/Al_(2)O_(3) Adsorbent Doped with KMnO_(4)

针对SO_(2)对吸附剂CO_(2)吸附性能的影响,该文采用溶胶-凝胶法制备氧化铝气凝胶载体,浸渍法制备吸附剂,通过固定床实验系统进行N2低温吸附-脱附实验,研究了掺杂KMnO_(4)的K_(2)CO_(3)/Al_(2)O_(3)吸附剂CO_(2)吸附性能以及SO_(2)对吸附剂吸附性能的影响。利用Avrami模型计算吸附动力学,并结合吸附剂的孔隙和晶相结构变化分析吸附机理。结果表明:吸附实验最佳反应温度60℃,掺杂KMnO_(4)提高了K_(2)CO_(3)/Al_(2)O_(3)的CO_(2)吸附性能,吸附量提高0.13 mmol/g。在CO_(2)吸附实验中加入微量SO_(2),掺杂KMnO_(4)后会减小烟气中SO_(2)对CO_(2)吸附实验的影响,在200~320 mg/m^(3) SO_(2)浓度范围内,CO_(2)累积吸附量随SO_(2)浓度增加而减小,200 mg/m^(3)时吸附减少量最小,K_(2)CO_(3)/Al_(2)O_(3)吸附剂与KMnO_(4)/K_(2)CO_(3)/Al_(2)O_(3)吸附剂分别减少0.22 mmol/g和0.18 mmol/g。KMnO_(4)会与SO_(2)发生反应生成MnSO_(4)和K_(2)SO_(4),减少SO_(2)与活性组分K_(2)CO_(3)的反应,因此KMnO_(4)/K_(2)CO_(3)/Al_(2)O_(3)吸附剂具有一定的抗硫性。

In view of the effect of SO_(2)on the CO_(2)adsorption performance of the adsorbent,alumina aerogel prepared by solgel method,preparation of adsorbent by impregnation method,N2 low-temperature adsorption-desorption experiment by fixed bed experimental system were conducted to study the CO_(2)adsorption performance of K_(2)CO_(3)/Al_(2)O_(3) adsorbent doped with KMnO_(4) and the effect of SO_(2)on the adsorption performance of the adsorbent.The adsorption kinetics was calculated using the Avrami model,and the adsorption mechanism was analyzed in combination with the pore and crystal phase structure changes of the adsorbent.The result shows that the optimum reaction temperature of adsorption experiment is 60℃,doping KMnO_(4) improves the CO_(2)adsorption performance of K_(2)CO_(3)/Al_(2)O_(3),adsorption capacity increased by 0.13 mmol/g.Adding a small amount of SO_(2)in the CO_(2)adsorption experiment,and doping with KMnO_(4) will reduce the influence of SO_(2)in the flue gas on the CO_(2)adsorption experiment.In the range of 200~320 mg/m^(3) SO_(2)concentration,the cumulative adsorption amount of CO_(2)decreases with the increase of SO_(2)concentration.The adsorption reduction is the minimum when 200 mg/m^(3) SO_(2)concentration,the K_(2)CO_(3)/Al_(2)O_(3) adsorbent and KMnO_(4)/K_(2)CO_(3)/Al_(2)O_(3) adsorbent decreased respectively by 0.22 mmol/g and 0.18 mmol/g.It was found that KMnO_(4) would react with SO_(2)to generate MnSO_(4) and K_(2)SO_(4),which reduced the reaction between SO_(2)and active ingredient K_(2)CO_(3).Therefore,KMnO_(4)/K_(2)CO_(3)/Al_(2)O_(3) adsorbents had resistance to sulfur.