LaCoO<sub>3</sub>对H<sub>2</sub>S选择氧化性能的影响

LaCoO₃对H₂S选择氧化性能的影响

摘要: 使用溶胶-凝胶法制备了LaCoO₃催化剂，采用XRD、BET和XPS等方式对催化剂进行了表征，考察了该催化剂制备过程中煅烧温度、表面活性剂PEG-6000和PEG-20000含量对其H₂S选择氧化制硫磺反应催化活性的影响。结果表明，表面活性剂PEG-6000及PEG-20000的添加能明显提高LaCoO₃的催化活性。0.02 mol La（NO₃）₃+0.02mol Co（NO₃）₂溶液中添加0.30 g PEG-20000、煅烧温度为650℃时所制备的LaCoO₃催化活性最好；在最佳反应温度260℃下，H₂S的转化率达到96.10%，硫选择性为93.77%。

Abstract: A series of LaCoO₃ catalysts were prepared by sol-gel method and characterized by XRD, BET and XPS; the effect of calcination temperature and content of surfactant PEG-6000 and PEG-20000 on the catalytic activity of LaCoO₃ in the selective oxidation of H₂S to sulfur was investigated. The results illustrated that adding surfactant PEG-6000 and PEG-20000 can significantly improve the catalytic activity of LaCoO₃ in H₂S oxidation; the LaCoO₃ catalyst prepared by adding 0.30 g PEG-20000 in the solution of 0.02 mol La(NO₃)₃ + 0.02 mol Co(NO₃)₂ and calcination at 650 ℃ exhibits the highest activity in H₂S oxidation. Over this catalyst and under the optimum reaction temperature of 260 ℃, the conversion of H₂S reaches 96.10%, with a selectivity of 93.77% to sulfur.