A highly active catalyst based on two metal oxides, CeO₂/Co₃O₄, for the low temperature soot oxidation at low temperatures is reported. This catalyst was produced by depositing cobalt oxide by the method of deposition−precipitation with urea onto CeO₂ microstructures obtained by the hydrothermal method using urea and citric acid as precipitating agents. Catalytic experiments were performed by temperature programmed combustion, in a fixed-bed microreactor, under loose and tight contact conditions, using Printex-U (Evonik) as the model soot. The results showed that the CeO₂/Co₃O₄ material presented an enhanced activity for the soot oxidation reaction (50% soot conversion at 287 °C) compared with CeO₂ (50% soot conversion at 337 °C) and Co₃O₄ (50% soot conversion at 360 °C) catalysts separately. The catalytic activity for the CeO₂/Co₃O₄ catalyst is higher than the ones reported for Ce–Co based catalysts, tested under similar conditions, for soot oxidation (reduced by 46 °C the lowest temperature reached for the 50% soot conversion).

中文翻译：

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具有优异的烟灰氧化反应性能的CeO2 / Co3O4催化剂的合成

报道了基于两种金属氧化物CeO ₂ / Co ₃ O ₄的高活性催化剂，用于在低温下进行低温烟ot氧化。该催化剂是通过用尿素和柠檬酸作为沉淀剂通过水热法获得的CeO ₂微观结构上通过用尿素的沉积-沉淀方法沉积氧化钴而制得的。催化实验是通过在固定床微型反应器中，在松散且紧密的接触条件下，以程序升温燃烧的方式进行的，并使用Printex-U（赢创）作为模型烟ot。结果表明，CeO ₂ / Co ₃ O ₄与CeO ₂（337°C下50％的烟灰转化率）和Co ₃ O ₄（360°C下50％的烟灰转化率）催化剂相比，该材料对烟灰氧化反应（在287°C时的烟灰转化率为50％）表现出增强的活性。分别地。CeO ₂ / Co ₃ O ₄催化剂的催化活性高于在类似条件下测试的Ce-Co基催化剂对烟灰氧化的催化活性（降低46°C，烟灰转化率最低达到最低温度50°C ）。