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The NO catalytic oxidation activities of single-phase α-, β-, γ-, and δ-MnO2 were investigated. All the catalysts were systematically characterized using various techniques. The results showed that the catalytic activities were significantly affected by the MnO2 phase structures. Among the four catalysts, the urchin-like γ-MnO2 showed the best NO catalytic oxidation activity across the studied temperature...
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