Abstract:

The iron-based active component，Fe₂O₃，was prepared by co-precipitation method. Fe₃O₄ and Fe，were also prepared by reducing Fe₂O₃ at different temperature for different time. The adsorption behavior of them was investigated in COS/N₂ and H₂/COS/N₂ gas streams using the fixed bed reactor at 400 ℃，450 ℃ and 500 ℃，respectively. The results show that all three active components can adsorb COS and their adsorption ability varies with temperature. At 500 ℃，the sulfur capacity of Fe₃O₄ is the highest，and that of Fe is the lowest. While at the temperatures of 450 ℃ and 400 ℃，the sulfur capacity has the following sequence：Fe₂O₃ > Fe₃O₄ > Fe. In H₂/COS/N₂ gas stream，the reaction of COS hydrogenolysis is enhanced by increasing temperature. The iron sulfides have certain catalysis on COS hydrogenolysis and it has an active influence on inhibition of conversion from H₂S to COS.

摘要：

采用共沉淀法制备了脱硫用铁基吸附剂的主要活性组分Fe₂O₃，并对其进行还原处理，制备了不同价态的含铁组分Fe₃O₄和Fe。使用固定床反应装置分别考察了三者在400～500 ℃范围内、COS / N₂和H₂ / COS / N₂两种气氛下对COS的吸附和催化转化的行为。结果表明：在COS / N₂气氛下，三者对COS均有吸附，其吸附能力随温度的变化而异，不同温度下三者对COS吸附的硫容顺序为：Fe₂O₃>Fe₃O₄>Fe（400℃和450℃）；Fe₃O₄> Fe₂O₃>Fe（500℃）。在H₂ /COS / N₂ /气氛下，COS的氢解反应随着温度的升高而增强，各活性组分的硫化产物对COS的氢解反应都具有一定的催化作用，这对于抑制H₂S向COS转化具有积极的作用。