论文部分内容阅读
用穆斯堡尔谱考察了氧化铁脱硫剂在高温煤气中还原及硫化时的铁形态变化规律。在反应开始阶段,原脱硫剂中的α-Fe_2O_3即被迅速还原成Fe_3O_4,Fe_3O_4可进一步还原转化成α-Fe。反应初期Fe_3O_4和α-Fe都参与脱硫反应,其中α-Fe具有较高的脱硫活性,对整个脱硫过程而言α-Fe是主要的脱硫活性相。铁化合物与硅铝氧化物载体间存在相互作用,形成磁微晶颗粒及少量γ-Fe。在高温煤气条件下,FeS是唯一的铁硫化物,θ-Fe_3C则是α-Fe转化中的主要产物。适量的θ-Fe_3C对脱硫有促进作用。
The Mossbauer spectroscopy was used to investigate the change of iron speciation during the reduction and sulfidation of iron oxide desulfurizing agent in high temperature gas. At the beginning of the reaction, α-Fe_2O_3 in the original desulfurizer is rapidly reduced to Fe_3O_4, and Fe_3O_4 can be further reduced to α-Fe. During the initial reaction, both Fe 3 O 4 and α-Fe are involved in the desulfurization reaction, in which α-Fe has high desulfurization activity. Α-Fe is the main desulfurization active phase for the whole desulfurization process. The interaction between the iron compound and the Si-Al oxide support forms magnetic microcrystalline particles and a small amount of γ-Fe. Under high temperature gas conditions, FeS is the only iron sulfide, θ-Fe_3C is the main product of α-Fe conversion. The proper amount of θ-Fe_3C can promote the desulfurization.