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首页> 外文期刊>Applied Surface Science >Surface Chemistry And Catalytic Activity Of Ni/al_2o_3 Irradiated With High-energy Electron Beam
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Surface Chemistry And Catalytic Activity Of Ni/al_2o_3 Irradiated With High-energy Electron Beam

机译：高能电子束辐照Ni / al_2o_3的表面化学及催化活性

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摘要

The radiation effects induced effects by electron beam (EB) treatment on the catalytic activity of Ni/γ-Al_2O_3, 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-Al_2O_3 catalyst before and after the EB treatment. Higher energy EB treatment is useful for increasing the proportion of the active sites (such as Ni~0 and Ni/γ-Al_2O_3 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 CO_2/CH4-mixture into CO/H_2 gas was observed for the catalyst treated with 2 MeV energy and 600 kGy dose of EB relative to untreated.
机译：研究了电子束（EB）对Ni /γ-Al_2O_3催化活性的辐射效应，研究了不同EB能量和吸收辐射剂量下甲烷的二氧化碳重整。用透射电子显微镜（TEM），X射线衍射（XRD）和X射线光电子能谱（XPS）来确定EB处理前后Ni /γ-Al_2O_3催化剂的结构和表面状态的变化。较高能量的EB处理可用于增加表面上活性位点（例如Ni〜0和Ni /γ-Al_2O_3相）的比例。 Ni / Al比率的增加表明表面上的Ni分散随着EB处理而增加，导致活性位点的增加，从而导致催化活性的提高。 XPS测量还显示，随着EB剂量的增加，表面碳的减少。对于用2 MeV能量和600 kGy剂量的EB处理的催化剂，相对于未处理的催化剂，观察到CO_2 / CH4混合物向CO / H_2气体转化的最大增加20％。

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