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SO_3对锅炉设备安全造成严重威胁。为了研究飞灰中Fe_2O_3对SO_2气体的催化作用,在一维反应器上分别进行了SO_2气相氧化与固相催化氧化实验研究,并且用密度泛函理论的方法研究了SO_3生成机理。结果表明:SO_3的气相生成率随温度升高而增加,在Fe_2O_3作用下,SO_3催化生成率随温度升高呈先增加后降低趋势。在800℃时SO_3催化生成率达到最大值4.35%;SO_3生成率随烟气中SO_2浓度增加而降低,在Fe_2O_3催化作用下,SO_3生成率明显提高;高氧量对SO_3生成率的作用效果不明显;密度泛函分析Fe_2O_3催化生成SO_3的反应能垒为57.357k J/mol,远小于气相生成SO_3的反应能垒。因此,Fe_2O_3对SO_2的氧化具有良好催化作用。
SO_3 poses a serious threat to the safety of boiler equipment. In order to study the catalytic effect of Fe_2O_3 on the SO_2 gas in fly ash, the SO_2 gas phase oxidation and solid phase catalytic oxidation experiments were carried out on a one-dimensional reactor respectively. The formation mechanism of SO_3 was also studied by using density functional theory. The results showed that the gas phase formation rate of SO 3 increased with the increase of temperature. Under the action of Fe 2 O 3, the yield of SO 3 catalyst increased firstly and then decreased with the increase of temperature. At 800 ℃, the maximum yield of SO_3 catalyst reached 4.35%. The production rate of SO_3 decreased with the increase of SO_2 concentration in flue gas. Under the catalysis of Fe_2O_3, the production rate of SO_3 increased obviously. The effect of high oxygen level on SO_3 production rate was not effective It is obvious that the energy barrier of Fe_2O_3 catalyzed by SO_3 is 57.357k J / mol, which is much lower than that of gas-phase reaction of SO_3. Therefore, Fe 2 O 3 has a good catalytic effect on SO 2 oxidation.