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Activity and selectivity of manganese oxides in alcohols Conversion as influenced by gamma-irradiation

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Abstract

Manganese oxide samples obtained from thermal decomposition of manganese carbonate at 400 and 600 °C were subjected to different doses of g-irradiation within the range 0.2 to 1.6 MGy. The surface and catalytic properties of the above samples were studied using nitrogen adsorption isotherms measured at -196 °C and catalytic conversion of ethanol and isopropanol at 300-400 °C using micropulse technique. The results obtained revealed that manganese oxides obtained at 400 °C consisted of a mixture of Mn2O3 and MnO2 while the samples calcined at 600 °C composed entirely of Mn2O3. Gamma-irradiation resulted in a decrease in the particle size of manganese oxide phases with subsequent increase in their specific surface areas. Gamma-irradiation with 0.2 and 0.8 MGy effected a measurable progressive decrease in the catalytic activity in dehydration and dehydrogenation of both alcohols. However, the treated catalyst retained their initial activity upon exposure to a dose of 1.6 MGy. Also, g-irradiation increased the selectivities of the investigated solids towards dehydrogenation of both alcohols. The catalyst samples precalcined at 600 °C exhibited higher catalytic activities than those precalcined at 400 °C.

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Authors and Affiliations

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

    M. M. Doheim

  2. Department of Chemistry, Cairo University, Faculty of Science, Cairo, Egypt

    A. S. Ahmed

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

    H. A. El-Boohy

  4. National Research Center (NRC), Dokky, Cairo, Egypt

    G. A. El-Shobaky

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  1. M. M. Doheim
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  2. A. S. Ahmed
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  3. H. A. El-Boohy
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  4. G. A. El-Shobaky
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Doheim, M.M., Ahmed, A.S., El-Boohy, H.A. et al. Activity and selectivity of manganese oxides in alcohols Conversion as influenced by gamma-irradiation. Journal of Radioanalytical and Nuclear Chemistry 254, 583–588 (2002). https://doi.org/10.1023/A:1021610709770

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