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Surface chemistry and catalytic activity of Ni/Al2O3 irradiated with high-energy electron beam |
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| Authors: | Jin Jun Marshal Dhayal Young Hwan Han |
| Institution: | a Department of Optometry and Optic Science, Dongshin University, 252 Daeho-Dong, Naju 520-714, South Korea b Liquid Crystal and Self Assembled Monolayer Section, National Physical Laboratory, Dr. KS Krisnan Marg, New Delhi 120011, India c Department of Environmental Engineering, Dongshin University, 252 Daeho-Dong, Naju 520-714, South Korea d Korea Atomic Energy Research Institute, Daejeon, South Korea e Department of Nutrition, Section Radiation Biology, University of Vienna, Althanstr. 14, A-1090 Vienna, Austria |
| Abstract: | The radiation effects induced effects by electron beam (EB) treatment on the catalytic activity of Ni/γ-Al2O3 were studied for the carbon dioxide reforming of methane with different EB energy and absorbed radiation dose. Transmission electron microscope (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were used to determine the change in structure and surface states of Ni/γ-Al2O3 catalyst before and after the EB treatment. Higher energy EB treatment is useful for increasing the proportion of the active sites (such as Ni0 and NiAl2O4-phase) on the surface. The increase of Ni/Al-ratio indicates that the Ni dispersion on the surface increased with the EB-treatment, resulting in an increase of the active sites, which leads to improving the catalytic activity. XPS measurement also showed a decrease of the surface carbon with EB dose. The maximum 20% increase in the conversion of CO2/CH4-mixture into CO/H2 gas was observed for the catalyst treated with 2 MeV energy and 600 kGy dose of EB relative to untreated. |
| Keywords: | CO2 reforming of methane Ni/γ-Al2O3 Catalyst Electron beam radiation |
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