Considering the harmful effects of volatile organic compounds (VOCs) on the atmosphere and public health, the search for proper catalytic materials for the effective catalytic elimination of VOCs remains one of the most pressing issues in the environmental field. In this study, a series of mesoporous Co₃O₄-n (n = 0.00, 0.0001, 0.01, 0.05, 0.10, 1.00, representing the concentration of HNO₃ aqueous solution) catalysts were fabricated by the acid treatment of Co₃O₄ that was previously prepared via a hydroxycarbonate precipitation method (Co₃O₄-P). The catalytic performances of the prepared catalysts were evaluated for the model reaction of toluene oxidation. An obvious enhancement of catalytic activity in the reaction was achieved over the acid-treated Co₃O₄ catalysts using lower HNO₃ concentrations, with Co₃O₄-0.01 exhibiting the optimum catalytic activity (T₉₀ = 225 °C, 15 °C lower than that of Co₃O₄-P), excellent catalytic durability under dry conditions and a high regeneration capability under humid conditions. Benefitting from the dilute acid treatment, the Co₃O₄-n (n = 0.01, 0.05, 0.10) catalysts presented higher specific surface areas, more weak acidic sites and higher abundances of surface Co²⁺ and O_ads species, which were regarded as the key factors responsible for their enhanced catalytic activities.

考虑到挥发性有机化合物（VOC）对大气和公众健康的有害影响，寻找合适的催化材料以有效催化消除VOC仍然是环境领域最紧迫的问题之一。在这项研究中，一系列的孔共₃ ö ₄ -N（N = 0.00，0.0001，0.01，0.05，0.10，1.00，代表HNO浓度₃水溶液）催化剂通过Co的酸处理制成₃ ö ₄以前是通过羟基碳酸盐沉淀法（Co ₃ O ₄-P）。评价了制备的催化剂的催化性能，用于甲苯氧化的模型反应。与使用较低HNO ₃浓度的酸处理的Co ₃ O ₄催化剂相比，反应中的催化活性明显增强，其中Co ₃ O ₄ -0.01表现出最佳的催化活性（T ₉₀  = 225°C，15°C低于Co ₃ O ₄ -P），在干燥条件下具有优异的催化耐久性，在潮湿条件下具有较高的再生能力。受益于稀酸处理，Co ₃ O ₄-n（n = 0.01、0.05、0.10）催化剂具有较高的比表面积，较弱的酸性位点和较高的表面Co ²⁺和O _ads物种丰度，这被认为是增强其催化活性的关键因素。