Tuning size and catalytic activity of nano-clusters of cobalt oxide

Journal of Chemical Sciences

Aruna Dhathathreyan2¹  R Venkat Narayan²  Vinod Kanniah² 

[1] Chemical Laboratory, Central Leather Research Institute, Adyar, Chennai 600 020$$;Sathya Bama Deemed University, Jeppiar Nagar, Old Mahabalipuram Road, Chennai 600 119$$

关键词: Cobalt oxide;    nano cluster;    catalytic activity;    pore sizes.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

Cobalt oxides were prepared by three different methods: (1) by reacting cobalt nitrate with oxalic acid, (2) co-precipitating cobalt nitrate with sodium carbonate, and (3) using sodium dodecyl sulphate as organic surfactant. All three samples were characterized before and after calcination by solvent extraction and the resulting products examined by IR spectroscopy. In the case of method 3, the removal of surfactant was followed by TGA studies. Products from all three methods were identified by XRD. Peaks in low angle XRD indicate the porous nature of the oxides. The morphology of the pores was studied by transmission electron microscopy. Some irregular pore structures were obtained for samples from methods 1 and 2, with an average size of 4-6 nm. Only the product from method 3 using SDS as template showed ordered structure and optimum size, and Brunauer-Emmet-Teller surface areas of the as-prepared, as well as the treated samples, exhibited H3 type hysteresis. The samples from the three methods were used as catalysts in the oxidation reaction of cyclohexane under mild conditions and the catalytic efficiency of the cobalt oxide was comparable with mesoporous cobalt oxides.

【 授权许可】

Unknown