Facile Controlled Synthesis of Pt/MnO2 Nanostructured Catalysts and Their Catalytic Performance for Oxidative Decomposition of Formaldehyde

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• 作者：Xuehua Yu ; Junhui He ; Donghui Wang ; Yucai Hu ; Hua Tian ; Zhicheng He
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：January 12, 2012
• 年：2012
• 卷：116
• 期：1
• 页码：851-860
• 全文大小：734K
• 年卷期：v.116,no.1(January 12, 2012)
• ISSN：1932-7455

文摘

Pt/MnO₂ nanostructured catalysts with cocoon-, urchin-, and nest-like morphologies were synthesized by a facile method. The synthesized MnO₂ nanostructures and Pt/MnO₂ catalysts were characterized by means of X-ray diffraction (XRD), N₂ adsorption鈥揹esorption, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). TEM analyses showed that Pt nanoparticles of 1鈥? nm were evenly dispersed on the surface of three MnO₂ nanostructures, and no Pt nanoparticle agglomeration occurred in the Pt/MnO₂ catalysts. These Pt/MnO₂ catalysts showed much higher catalytic activities than the corresponding MnO₂ nanostructures for oxidative decomposition of formaldehyde. Comparison of Pt/MnO₂ catalysts with varied Pt loadings and MnO₂ morphologies revealed that 2 wt % is the optimal Pt loading, and 2 wt % Pt/nest-like MnO₂ showed the highest catalytic activity for oxidative decomposition of formaldehyde (temperature for complete decomposition of HCHO is 70 掳C). The high dispersion and small size of Pt nanoparticles and the synergistic effect between the Pt nanoparticle and MnO₂ nanostructure are considered to be the main reasons for the observed high catalytic activity of Pt/nest-like MnO₂.