纳米片聚结Co3O4微球催化甲苯燃烧

采用乙二胺辅助的水热法制备了纳米片聚结的Co₃O₄微球. 利用多种分析技术表征了其物化性质，并评价了其对甲苯燃烧的催化活性. 结果表明，由添加1.0 ml乙二胺经140 ℃水热处理12 h后制得的Co₃O₄样品呈纳米片聚结的微球状表面形貌. Co₃O₄微球样品的比表面积约为66 m² g^-1. 与体相Co₃O₄样品相比，Co₃O₄微球样品具有较高的氧吸附物种浓度和较好的低温还原性. 当空速为20000 ml g^-1 h^-1时，在Co₃O₄微球样品上甲苯转化率达到50%和90%时的反应温度分别为230和254 ℃. 这与该样品具有较大的比表面积、较高的氧吸附物种浓度和较好的低温还原性相关.

Nanoplate-aggregate Co3O4 microspheres for toluene combustion

Nanoplate-aggregate microspherical Co₃O₄ was prepared by an ethylenediamine-assisted hydrothermal route and characterized by means of numerous techniques. Their catalytic activities for toluene combustion were evaluated. The Co₃O₄ sample obtained using 1.0 ml of ethylenediamine and a hydrothermal treatment at 140 ℃ for 12 h had a nanoplate-aggregate microspherical morphology. This microspherical Co₃O₄ sample with a surface area of 66 m² g^-1 had a higher adsorbed oxygen concentration and better low-temperature reducibility than bulk Co₃O₄. Over the Co₃O₄ microsphere sample, the temperatures required for 50% and 90% toluene conversions were 230 and 254 ℃, respectively, at a space velocity of 20000 ml g^-1 h^-1. The good catalytic performance of the Co₃O₄ microsphere sample was related to its large surface area, high oxygen adspecies concentration, and good low-temperature reducibility.