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• W2068005483 abstract "Highly dispersed cobalt on SBA-15 was successfully prepared by a post synthesis grafting of cobalt. Of the cobalt precursors tested, Co(II) acetylacetonate was found to be the best source for high dispersion of cobalt. The Co-SBA-15 catalysts were characterized with different techniques: N2 physisorption, XRD, TPR, TEM, and X-ray adsorption analysis. The mesoporous structure of SBA-15 was retained after cobalt grafting with up to 10 wt % Co loading. There were no large cobalt oxide particles formed, which indicates all the cobalt ions are highly dispersed on the surface and the direct bonding to the silica surfaces results in a high reduction temperature (1123 K) relative to Co oxides. X-ray absorption analysis demonstrates a local structure of Co ions with all Co ions isolated and bonded with oxygen. XANES analysis requires that the local environment for Co ions be that of either a distorted tetrahedral or an octahedral structure and the fitting of EXAFS data further shows a Co−O bond coordination number of 3.58 ± 0.48, confirming that the Co is in a distorted tetrahedral environment. The catalytic activity of Co-SBA-15 catalyst was studied for the synthesis of carbon single walled nanotubes (SWNT). The high reduction stability of Co-SBA-15 is presumed to make a favorable catalyst for this high temperature reaction. Raman spectroscopy and TEM photographs show that good quality carbon SWNT was synthesized by Co-SBA-15. Moreover, Co-SBA-15 has a higher yield of carbon SWNT compared with Co-MCM-41 (C16 alkyl template) under the same reaction conditions." @default.
• W2068005483 created "2016-06-24" @default.
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• W2068005483 date "2009-07-23" @default.
• W2068005483 modified "2023-09-24" @default.
• W2068005483 title "Synthesis, Characterization, and Catalytic Performance of Highly Dispersed Co-SBA-15" @default.
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• W2068005483 doi "https://doi.org/10.1021/jp901823v" @default.
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