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BET theory
About: BET theory is a research topic. Over the lifetime, 9046 publications have been published within this topic receiving 286142 citations.
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TL;DR: In this paper, a uniform microporous polymer nanoparticles (MPNs) and their hydrogen storage properties were studied, which are analogous to gel-type suspension polymerized particles typically of 10-500 μm in diameter and are essentially nonporous in the dry state having only a very nominal surface area (1-2 m2/g, BET surface area).
Abstract: This work is aimed at producing uniform microporous polymer nanoparticles (MPNs) and studying their hydrogen storage properties. Synthesis of vinylbenzyl chloride (VBC)/divinylbenzene (DVB) copolymers by emulsion polymerization yield fairly uniform gel-type precursor nanoparticles and the particle size can be tuned from 36 to 131 nm by adjusting the emulsifier dose. These are analogous to gel-type suspension polymerized particles typically of 10–500 μm in diameter and are essentially non-porous in the dry state having only a very nominal surface area (1–2 m2/g, BET surface area). Friedel–Crafts-type hyper-cross-linking reaction of these precursors yields uniform MPNs with extremely high surface area up to ca. 1500 m2/g (BET surface area). Moreover, MPNs present more micropore volume (0.56 cm3/g), higher hydrogen adsorption capacity (1.59 wt%, 77.3 K, 1.13 bar), higher isosteric heats for hydrogen and faster adsorption rate as compared to polydisperse micro-size analogues previously reported.
95 citations
TL;DR: In this article, the effects of preparation parameters such as activation temperature and impregnation ratio on the properties of activated carbons were investigated, and it was found that both the vacuum condition and base-leaching process have positive effects on the specific surface area and mesopore structure characteristics.
94 citations
TL;DR: In this paper, activated carbon prepared from hazelnut husk (HHAC) using zinc chloride as chemical activating agent was characterized by FT-IR spectroscopy, BET surface area, Boehm titration, SEM and elemental analyses.
94 citations
TL;DR: In this paper, the effect of surface oxygen groups in AX-21 on hydrogen storage was investigated, and the results showed that Pd supported on oxygen-modified AX21 (Pd/AX-21-O) had a higher hydrogen storage capacity than Pd support on unmodified AX 21 (PD/AX 21-O).
Abstract: Hydrogen adsorption properties of two different carbon materials (superactivated carbon, AX-21, and graphite oxide) doped with Pd nanoparticles have been studied. The effect of surface oxygen groups in AX-21 on hydrogen storage was investigated, and the results showed Pd supported on oxygen-modified AX-21 (Pd/AX-21-O) had a higher hydrogen storage capacity than Pd supported on unmodified AX-21 (Pd/AX-21). Overall heats of adsorption were obtained from the temperature dependence of the isotherms, and higher values were shown on the oxygen-modified AX-21 sample than the unmodified one, showing that the surface oxygen groups were favorable for hydrogen adsorption. Furthermore, a sample comprising Pd supported on graphite oxide with more surface oxygen (Pd/graphite oxide) was studied. The hydrogen adsorption on this sample showed a hydrogen storage capacity of 0.95 wt % at 100 atm and 298 K. Normalized by the BET surface area, the Pd/graphite oxide exhibited 2.8× the storage capacity of Pd/AX-21-O and 3.4× th...
94 citations
TL;DR: In this paper, the authors investigated the properties of the solid waxy product obtained from high and low-density polyethylene (HDPE and LDPE) under mild conditions.
94 citations