Transition metal oxides are promising catalysts for catalytic oxidation reactions but are hampered by low room-temperature activities. Such low activities are normally caused by sparse reactive sites and insufficient capacity for molecular oxygen (O₂) activation. Here, we present a dual-stimulation strategy to tackle these two issues. Specifically, we import highly dispersed nickel (Ni) atoms onto MnO₂ to enrich its oxygen vacancies (reactive sites). Then, we use molecular ozone (O₃) with a lower activation energy as an oxidant instead of molecular O₂. With such dual stimulations, the constructed O₃–Ni/MnO₂ catalytic system shows boosted room-temperature activity for toluene oxidation with a toluene conversion of up to 98%, compared with the O₃–MnO₂ (Ni-free) system with only 50% conversion and the inactive O₂–Ni/MnO₂ (O₃-free) system. This leap realizes efficient room-temperature catalytic oxidation of transition metal oxides, which is constantly pursued but has always been difficult to truly achieve.

中文翻译：

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高度分散的 Ni 原子和 O3 促进室温催化氧化


过渡金属氧化物是催化氧化反应的有前途的催化剂，但受到低室温活性的阻碍。如此低的活性通常是由于反应位点稀疏和分子氧 (O ₂ ) 活化能力不足造成的。在这里，我们提出了解决这两个问题的双重刺激策略。具体来说，我们将高度分散的镍（Ni）原子导入到MnO ₂ 上，以丰富其氧空位（反应位点）。然后，我们使用活化能较低的分子臭氧（O ₃ ）代替分子 O ₂ 作为氧化剂。通过这种双重刺激，构建的 O ₃ –Ni/MnO ₂ 催化体系表现出更高的室温甲苯氧化活性，与传统的催化剂相比，甲苯转化率高达 98%。 O ₃ –MnO ₂ （无镍）体系，转化率仅为 50%，且不活泼 O ₂ –Ni/MnO ₂ （O ₃ -自由）系统。这一飞跃实现了过渡金属氧化物的高效室温催化氧化，这是人们不断追求但始终难以真正实现的。