Highly Dispersed MnOx Nanoparticles on Shape-Controlled SiO2 Spheres for Ecofriendly Selective Allylic Oxidation of Cyclohexene

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作   者：

Rao, Bolla Govinda;  Sudarsanam, Putla;  Rao, Tumula Venkateshwar;  Amin, Mohamad Hassan;  Bhargava, Suresh K.;  Reddy, Benjaram M.; 

作者机构：

Vic 3001;  CSIR;  Australia;  Catalysis & Fine Chem Dept;  Indian Inst Chem Technol;  Hyderabad 500007;  Uppal Rd;  India;  GPO Box 2476;  Ctr Adv Mat & Ind Chem;  RMIT Univ;  Sch Sci;  Melbourne; 

关键词：

Shape-controlled catalyst;  Structure-performance relationship;  SiO2 nanospheres;  Synergetic interaction;  MnOx nanoparticles;  Cyclohexene oxidation; 

期刊名称：

Catalysis Letters

i s s n：

1011-372X

年卷期：

2020 年 150 卷 10 期

页   码：

3023-3035

页   码：

摘   要：

Shape-controlled metal nanomaterials are considered as a unique class of catalysts because of their synergistic size- and shape-dependent catalytic properties. This work reports the synthesis of a novel size- and shape-controlled catalyst, consisting of highly dispersed MnOx nanoparticles (average particle size of 4.5 nm) on shape-controlled SiO2 nanospheres (250-300 nm) for selective cyclohexene oxidation using air as the oxidant under solvent- and base-free conditions. The MnOx/SiO2 catalyst exhibited an excellent cyclohexene conversion (92%) with a high selectivity (96%) to the allylic products (2-cyclohexene-ol and 2-cyclohexene-one) under mild conditions, outperforming various SiO2 supported CoOx, FeOx, and CuOx catalysts. The better performance of shape-controlled MnOx/SiO2 nanocatalyst is due to high redox nature of Mn, uniform dispersion of smaller sized MnOx nanoparticles, and synergetic interaction between MnOx and SiO2 spheres, as evidenced by XPS and TEM studies. Further, the MnOx/SiO2 catalyst could be reused at least 5 times for selective cyclohexene oxidation with a negligible loss in its catalytic performance, indicating the excellent stability of shape-controlled metal nanocatalysts in organic synthesis under economically viable and mild conditions.