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Get Chemistry and Physics of Carbon, Vol. 30 PDF

By Ljubisa R. Radovic

ISBN-10: 142004298X

ISBN-13: 9781420042986

Written by means of exotic researchers in carbon, the long-running sequence Chemistry and Physics of Carbon presents a accomplished assessment of the molecular constitution of carbons and demonstrates how sleek computational and modeling equipment could give a contribution to the prediction of carbon fabric adsorption, separation, and diffusion. quantity 30 explores the subject from a pragmatic perspective, with chapters on template techniques to synthesizing porous carbons, carbon fabrics as catalysts, and sorption of heavy oils into carbon fabrics. This installment additionally discusses carbon activation by means of alkaline hydroxides and contains an up-to-date standpoint at the characterization of carbon floor chemistry.

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77–78: 325–330, 2002. With permission). , carbon fibers, coal, Saran char, lignocellulosic materials) have been physically activated with CO2 or with steam. 24a plots the micropore volume (calculated from N2 isotherms at 77 K) against the apparent BET surface area for samples with different BO degrees. It is seen that, as expected, microporosity develops linearly with BO, and there is a known and well-defined correlation between micropore volume and BET surface area [8]. This is the general behavior found for most ACs prepared by physical activation from different precursors [8,21,26,27,120,121].

15 plots the mean pore size (L, calculated from the Dubinin equation) as a function of the HTT used, and confirms that L increases almost linearly with temperature, which is indicative of MPSD widening. 15, both the heating rate and the maximum HTT affect the activation process. A drastic combination of these two variables is analyzed next. The sample prepared by changing in a remarkable way the HTT (950°C) and the heating rate (higher than 50°C/min) shows a very special behavior. 5). 14 N2 adsorption isotherms corresponding to samples prepared at different activation temperatures: (a) an oak char by chemical activation with NaOH.

33. This figure presents a thermogravimetric (TG) analysis of the different precursors done in air (60 mL/min), at 5°C/min. , and Linares-Solano, A. Carbon 42(7): 1371–1375, 2004. With permission from Elsevier). least reactive [130]. The reactivity of the lignite (L) is much higher than that of the carbonized lignite (LC). D. Influence of Precursor Structural Order Some of the results discussed previously show that KOH and NaOH present similar activation behavior. B. The relative effectiveness of the hydroxides depends on the nature of the precursor, especially on its structural order [100,101]; NaOH is apparently better for carbons without structural order, whereas KOH seems better for those having some structural order.

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Chemistry and Physics of Carbon, Vol. 30 by Ljubisa R. Radovic

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