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• W2024354959 endingPage "18431" @default.
• W2024354959 startingPage "18424" @default.
• W2024354959 abstract "Carbon materials have been prepared using zeolite 13X or zeolite Y as template and acetonitrile or ethylene as carbon source via chemical vapor deposition (CVD) at 550−1000 °C. Materials obtained from acetonitrile at 750−850 °C (zeolite 13X) or 750−900 °C (zeolite Y) have high surface area (1170−1920 m2/g), high pore volume (0.75−1.4 cm3 g-1), and exhibit some structural ordering replicated from the zeolite templates. Templating with zeolite Y generally results in materials with higher surface area. High CVD temperature (≥900 °C) results in low surface area materials that have significant proportions of graphitic carbon and no zeolite-type structural ordering. The nitrogen content of the samples derived from acetonitrile varies between 5 and 8 wt %. When ethylene is used as a carbon precursor, high surface area (800−1300 m2/g) materials are only obtained at lower CVD temperature (550−750 °C). The ethylene-derived carbons retain some zeolite-type pore channel ordering but also exhibit significant levels of graphitization even at low CVD temperature. In general, the carbon materials retain the particle morphology of the zeolite templates, with solid-core particles obtained at 750−850 °C while hollow shells are generated at higher CVD temperature (≥900 °C). We observed hydrogen uptake of up to 4.5 wt % and 45 g H2/L (volumetric density) at −196 °C and 20 bar for the carbon materials. The hydrogen uptake was found to be dependent on surface area and was therefore influenced by the choice of zeolite template and carbon source. Zeolite Y-templated N-doped carbons had the highest hydrogen uptake capacity. Gravimetric and volumetric methods gave similar uptake capacity at 1 bar (i.e., 1.6 and 2.0 wt % for zeolite 13X and Y-templated N-doped carbons, respectively). Our findings show that zeolite-templated carbons are attractive for hydrogen storage and highlight the potential benefits of functionalization (nitrogen-doping)." @default.
• W2024354959 created "2016-06-24" @default.
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• W2024354959 date "2006-09-01" @default.
• W2024354959 modified "2023-10-16" @default.
• W2024354959 title "Preparation and Hydrogen Storage Properties of Zeolite-Templated Carbon Materials Nanocast via Chemical Vapor Deposition: Effect of the Zeolite Template and Nitrogen Doping" @default.
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• W2024354959 doi "https://doi.org/10.1021/jp0639849" @default.
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