【摘要】 低浓度甲烷来源多，总排放量大，导致严重的温室效应。催化燃烧技术是治理低浓度甲烷的有效方法之一，催化剂的性能是影响催化燃烧效果的关键因素。利用柠檬酸溶液燃烧法制备了Co₃O₄前驱体，然后将其在不同温度下焙烧，制得一系列Co₃O₄催化剂用于去除甲烷，采用XRD、Raman、SEM和H₂-TPR等方法表征。结果发现，升高焙烧温度，Co₃O₄的晶格缺陷数量、比表面积、表面Co³⁺含量以及氧化还原能力均降低，但是其Co-O相互作用增强。当焙烧温度为400℃时，Co₃O₄表面吸附氧物种含量最高，吸附氧物种与晶格氧物种比值达0.254，这有利于提升Co₃O₄催化活性。Co₃O₄-400的T₉₀值为380℃，该催化剂在390℃时具有良好的抗水抗硫中毒性能，通入体积分数为1.2%的水汽和0.003%的SO₂，反应4 h活性下降不超过1%，为低浓度甲烷催化燃烧材料的开发提供思路。更多还原

【Abstract】 Low-concentration methane sources are numerous and the total emission volume is large,leading to severe greenhouse effects. Catalytic combustion technology is one of the effective methods for treating low-concentration methane. The performance of the catalyst is a key factor affecting the catalytic combustion effect. The Co₃ O₄ precursor was prepared by the combustion method using citric acid solution,and then it was calcined at different temperatures to prepare a series of Co₃ O₄ catalysts for removing methane. The catalysts were characterized by XRD,Raman,SEM and H₂-TPR methods. The results showed that increasing the calcination temperature reduced the number of lattice defects,specific surface area,surface Co^{3 +}content and redox ability of Co₃O₄,but enhanced the Co-O interaction. When the calcination temperature was 400 ℃,the content of oxygen species adsorbed on the surface of Co₃ O₄ was the highest,and the ratio of adsorbed oxygen species to lattice oxygen species reached 0. 254,which was conducive to improving the catalytic activity of Co₃O₄. The T₉₀value of Co₃O₄-400 was 380 ℃. This catalyst had good resistance to water and sulfur poisoning at 390 ℃. When water vapor with a volume fraction of 1. 2% and 0. 003% SO₂ were introduced,the activity of the catalyst did not decrease by more than 1% after 4 hours of reaction,providing ideas for the development of low-concentration methane catalytic combustion materials.更多还原