Citation: WU Xiao-Qin, ZONG Rui-Long, ZHU Yong-Fa. Enhanced MnO₂ Nanorods to CO and Volatile Organic Compounds Oxidative Activity by Platinum Nanoparticles[J]. Acta Physico-Chimica Sinica, ;2012, 28(02): 437-444. doi: 10.3866/PKU.WHXB201112082 shu

Enhanced MnO₂ Nanorods to CO and Volatile Organic Compounds Oxidative Activity by Platinum Nanoparticles

1.
1. Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China;
2. College of Environmental and Chemical Engineering, Nanchang Hang Kong University, Nanchang 330063, P. R .China

Received Date: 29 September 2011
Available Online: 8 December 2011
Fund Project: 国家自然科学基金(20925725) (20925725) 国家重点基础研究发展规划项目(973) (2007CB613303) (973) (2007CB613303)江西省教育厅科技项目(GJJ11507)资助 (GJJ11507)

Pure-phase α-MnO₂ and δ-MnO₂ nanorods were synthesized through an easy solution-based hydrothermal method. Platinum nanoparticles supported by the obtained MnO₂ nanorods were prepared by the colloid deposition process. The microstructure and adsorption activity of the obtained catalysts were researched by different techniques such as transmission electron microscopy (TEM), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), N₂ adsorption-desorption measurements, and H₂ temperature-programmed reduction (H₂-TPR). The cataluminescence (CTL) properties of CO and volatile organic compounds (VOCs), such as benzene and toluene, on the resultant catalysts were explored. The results showed that the platinum nanoparticles were well distributed in α-MnO₂ and δ-MnO₂. In addition, the Pt load process does not affect the crystal phase structure of the α-MnO₂ nanorods, but can generate structural changes in the δ-MnO₂ nanorods. The phase transformation did not the result of the reaction between the δ-MnO₂ nanorods and Pt as shown in the XPS study. The α-MnO₂ and δ-MnO₂ nanorods showed a high catalytic oxidative activity toward CO, benzene, and toluene, and δ-MnO₂ showed a higher activity than the α-MnO₂ phase. Although, the Pt load led to a decrease in the surface area of the MnO₂ nanorods which was confirmed by the N₂ adsorption-desorption measurements, but the H₂-TPR results showed that the interaction between Pt and MnO₂ was intense, which significantly enhanced its catalytic activity. The Pt/δ-MnO₂ nanorods exhibited a higher activity than Pt/α-MnO₂. CTL research showed that the activities of the four catalysts increased in the order of α-MnO₂≤ δ-MnO₂ < Pt/α-MnO₂ < Pt/δ-MnO₂, and the H₂-TPR results were consistent. Pt loading significantly enhanced the catalytic oxidative activity of α-MnO₂ and δ-MnO₂ nanorods to CO, benzene, and toluene.
- Catalytic activity,
- MnO₂ nanorod,
- Pt nanoparticle,
- Cataluminescence,
- CO,
- Benzene,
- Toluene
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Enhanced MnO₂ Nanorods to CO and Volatile Organic Compounds Oxidative Activity by Platinum Nanoparticles