Dark heterogeneous catalysis dismisses the need for both light and additional chemicals, and it also complements or even replaces more traditional pollutant abatement processes. Although recently reported, dark catalysts take several hours to bring the pollutant concentration to under 50 %, tested just with low weight pollutants, and their structural-mechanism relations have remained uncharacterized. Therefore, calcium nickel-iron mixed oxides (CNF) based catalysts, synthesized targeting CaNi_xFe_(1-x)O_3-δ, are here introduced. The oxides mixture demonstrated (under 50 % after 5 min) to be effective and fast on the degradation of several pollutants under dark conditions, without the addition of reagents or energy/light irradiation, degradation attributed mainly to Ni-doped Ca₂Fe₂O₅. The active species analysis revealed a reaction scheme initiated by the contact pollutant-catalyst, followed by the pollutant molecule's breakdown, following the generation of hydroxyl radicals, electrons, singlet oxygen, and electrons/holes hopping within the material. It is anticipated that this work will inspire the future design of this sort of catalyst.

深色的多相催化消除了对轻质化学品和其他化学品的需求，并且还补充甚至替代了更传统的污染物减排工艺。尽管最近有报道，但深色催化剂需要花费几个小时才能使污染物浓度降至50％以下（仅使用低重量污染物进行了测试），而且它们的结构-机理关系仍然不明确。因此，针对CaNi _x Fe _（1-x） O _{3 -} δ合成的钙镍铁混合氧化物（CNF）基催化剂，这里介绍。该氧化物混合物证明（在5分钟后低于50％）在黑暗条件下对几种污染物的降解是有效且快速的，而无需添加试剂或能量/光辐射，降解主要归因于掺Ni的Ca ₂ Fe ₂ O ₅。活性物质分析揭示了一种由接触污染物催化剂引发的反应方案，随后污染物分子的分解，继而在材料内产生了羟基自由基，电子，单线态氧和电子/空穴跳跃。预计这项工作将激发这种催化剂的未来设计。