MnO2 Framework for Instantaneous Mineralization of Carcinogenic Airborne Formaldehyde at Room Temperature

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• 作者：Shaopeng Rong ; Pengyi ZhangYajie Yang ; Lin Zhu ; Jinlong Wang ; Fang Liu
• 刊名：ACS Catalysis
• 出版年：2017
• 出版时间：February 3, 2017
• 年：2017
• 卷：7
• 期：2
• 页码：1057-1067
• 全文大小：884K
• ISSN：2155-5435

文摘

Formaldehyde (HCHO) causes increasing concerns, because of its ubiquitous presence in the indoor environment and its irritating and carcinogenic nature, with regard to humans. The fast abatement of HCHO is of significant practical interest at room temperature. In this paper, we fabricate a three-dimensional manganese dioxide framework (3D-MnO₂), which has interconnected network structures, low mass density (∼7.3 mg cm^–3), and high absorption capacity for organic liquids. In particular, the 3D-MnO₂ showed excellent activity and stability for HCHO oxidation at room temperature, achieving 45% of 100 ppm of HCHO mineralized into CO₂ under high gas hourly space velocity (GHSV = 180 L g_cat^–1 h^–1). The excellent performance of 3D-MnO₂ catalysts in decomposing HCHO can be ascribed to their quick reversibility and high water content for replenishing the consumed surface hydroxyl groups during HCHO decomposition, and fully exposed active reaction sites. It is valuable to know that inexpensive metal oxides such as MnO₂ can transform ppm-level HCHO into harmless CO₂ in a timeframe as brief as a subsecond at room temperature.