超细氧缺位Fe_3O_(4-δ)粉末的制备及其分解SO_2成S的研究

摘要

研究在不同温度下以CO还原天然磁铁矿制备氧缺位Fe_3O_(4-δ)的过程,并考察了其分解SO_2成S的能力.样品用水作溶剂经湿法球磨500 h制备,采用SEM、XRD等手段对制备的样品进行表征.通过检测系统压力变化研究Fe_3O_(4-δ)分解SO_2成S的能力.研究结果表明:随着温度的变化,分解SO_2能力呈单一峰规律;在CO流量为40 mL/min,还原6 h条件下,当反应温度为673 K时,制备的Fe_3O_(4-δ)分解SO_2能力最强,每克磁铁矿样品分解SO_2为196 mg.%The oxygen-deficient Fe_3O_(4-δ).was prepared by reducing the natural magnetite powder at the different temperatures using CO as reduction agent, and its catalytic activity was tested by decomposing SO_2 into S~((0)) . The Fe_3O_(4-δ) sample was prepared by grinding the magnetite with wet ball-milling for 500 h, and characterized by means of SEM and XRD. The activity of decomposing SO_2 with Fe_3O_(4-δ) was monitered by pressure variation of the reaction gas system. The investigated results show that the activity of decomposing SO_2 appears as a single peak law in the tested temperature range; the prepared Fe_3O_(4-δ), at the CO flow rate of 40 mL/min, the reaction temperature of 673 K, the reduction time of 6 h, has the highest activity in decomposing SO_2 into S~((0)), I. E. The magnetite of 1 g in weight can decompose SO_2 of 196 mg into S~((0)).