Controlled Generation of Uniform Spherical LaMnO3, LaCoO3, Mn2O3, and Co3O4 Nanoparticles and Their High Catalytic Performance for Car

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• 作者：Yuxi Liu ; Hongxing Dai ; Jiguang Deng ; Lei Zhang ; Zhenxuan Zhao ; Xinwei Li ; Yuan Wang ; Shaohua Xie ; Huanggen Yang ; Guangsheng Guo
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：August 5, 2013
• 年：2013
• 卷：52
• 期：15
• 页码：8665-8676
• 全文大小：968K
• 年卷期：v.52,no.15(August 5, 2013)
• ISSN：1520-510X

文摘

Uniform hollow spherical rhombohedral LaMO₃ and solid spherical cubic MO_x (M = Mn and Co) NPs were fabricated using the PMMA-templating strategy. Hollow spherical LaMO₃ and solid spherical MO_x NPs possessed surface areas of 21鈥?3 and 21鈥?4 m²/g, respectively. There were larger amounts of surface-adsorbed oxygen species and better low-temperature reducibility on/of the hollow spherical LaMO₃ samples than on/of the solid spherical MO_x samples. Hollow spherical LaMO₃ and solid spherical MO_x samples outperformed their nanosized counterparts for oxidation of CO and toluene, with the best catalytic activity being achieved over the solid spherical Co₃O₄ sample for CO oxidation (T_50% = 81 掳C and T_90% = 109 掳C) at space velocity = 10鈥?00 mL/(g h) and the hollow spherical LaCoO₃ sample for toluene oxidation (T_50% = 220 掳C and T_90% = 237 掳C) at space velocity = 20鈥?00 mL/(g h). It is concluded that the higher surface areas and oxygen adspecies concentrations and better low-temperature reducibility are responsible for the excellent catalytic performance of the hollow spherical LaCoO₃ and solid spherical Co₃O₄ NPs. We believe that the PMMA-templating strategy provides an effective route to prepare uniform perovskite-type oxide and transition-metal oxide NPs.