焙烧活化对Mn/ATP脱硫剂组成及脱硫性能的影响

Effect of Calcination Activation on Composition and Desulfurization Performance of Mn/ATP Desulfurizer

摘要:

以凹凸棒石（ATP）为载体，通过沉淀法及焙烧活化得到Mn/ATP脱硫剂。采用XRD、TG、IR、SEM和H2-TPR等分析手段对Mn/ATP脱硫剂进行表征，结合反应热力学计算分析了焙烧活化过程脱硫剂的变化情况。通过固定床反应器，考察了常温条件下Mn/ATP的脱硫活性。结果表明，焙烧温度和焙烧方式对脱硫剂影响较大。静态空气中随着温度升高，MnCO3分解生成MnO2，当氧气含量下降后MnO2逐渐分解生成较低价态锰氧化物。改变焙烧方式后，充足的氧气含量降低了脱硫剂的活化温度，抑制了MnO2的分解反应。动态空气中400℃焙烧活化制得MnO2/ATP，在常温20℃下脱硫剂有最大脱硫活性，穿透硫容为172.0 mg?g-1。

Abstract:

Mn/ATP desulfurizers were prepared by precipitation method and calcination activation with attapulgite (ATP) as carrier. The Mn/ATP desulfurizers were characterized by means of XRD, TG, IR, SEM and H2-TPR. The change of desulfurizers was analyzed by thermodynamic calculation in the process of roasting activation. The desulfurization activity of Mn/ATP under normal temperature was investigated in a fixed bed reactor. The results show that the calcination temperature and calcination method have great influence on desulfurization agent. With the increase of temperature, MnCO3 decomposes into MnO2 in static air; When oxygen content decreases, MnO2 gradually decomposes into lower valence manganese oxides; Changing the roasting method, the sufficient oxygen content reduces the activation temperature of the desulfurizer, and inhibits the decomposition reaction of MnO2. The MnO2/ATP prepared by roasting in dynamic air at 400℃ has the maximum desulfurization activity at room temperature of 20℃, and the breakthrough sulfur content is 172 mg/g.