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Effect of gamma-irradiation on surface and catalytic properties of Co3O4 doped with NiO

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Abstract

NiO-doped Co3O4 samples precalcined at 500 °C were subjected to various doses of γ-rays within the range 0.2-1.6 MGy. The particle size and BET-surface areas of different samples were determined using XRD and nitrogen adsorption at -196 °C. The catalytic reactions studied were conversion of ethanol and isopropanol at 250-400 °C using a micropulse technique and H2O2 decomposition in aqueous solution at 30-50 °C. The results revealed that the γ-irradiation brought a significant decrease in the particle size of Co3O4 phase with subsequent increase in the SBET surface areas. The treatment brought also a progressive decrease in the total conversion of both alcohol (dehydration and dehydrogenation) falling to a minimum value (about 20% of its initial activity) at a dose of 0.8 MGy. The catalysts retain their initial activity upon exposure to a dose of 1.6 MGy. On the other hand, the catalytic activity in H2O2 decomposition of the investigated system decreased progressively by increasing the dose of γ-rays and the catalysts lost more than 90% of their initial activity upon exposure to a dose of 1.6 MGy.

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Authors and Affiliations

  1. National Research Center (NRC), Dokki, Cairo, Egypt

    G. A. El-Shobaky

  2. Egyptian Petroleum Research Institute (EPRI), Nasr City, Cairo, Egypt

    M. M. Doheim

  3. Department of Chemistry, Faculty of Science, Canal Suez University, Ismailia, Egypt

    A. M. Turky

  4. National Center for Radiation Research and Technology (NCRRT), Nasr City, Cairo, Egypt

    H. A. El-Boohy

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  1. G. A. El-Shobaky
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  2. M. M. Doheim
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  3. A. M. Turky
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  4. H. A. El-Boohy
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El-Shobaky, G.A., Doheim, M.M., Turky, A.M. et al. Effect of gamma-irradiation on surface and catalytic properties of Co3O4 doped with NiO. Journal of Radioanalytical and Nuclear Chemistry 256, 107–113 (2003). https://doi.org/10.1023/A:1023360328078

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