By Ljubisa R. Radovic
Written by way of distinctive researchers in carbon, the long-running sequence Chemistry and Physics of Carbon offers a entire evaluate of the molecular constitution of carbons and demonstrates how sleek computational and modeling tools may well give a contribution to the prediction of carbon fabric adsorption, separation, and diffusion. quantity 30 explores the subject from a pragmatic viewpoint, with chapters on template methods to synthesizing porous carbons, carbon fabrics as catalysts, and sorption of heavy oils into carbon fabrics. This installment additionally discusses carbon activation through alkaline hydroxides and comprises an up-to-date standpoint at the characterization of carbon floor chemistry.
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Additional resources for Chemistry and Physics of Carbon, Vol. 30
18 presents the apparent BET surface areas of samples prepared by controlling selected variables of the activation process. The samples have been obtained by keeping constant the nature of the precursor (anthracite) and the nature of the hydroxide (KOH). It can be seen that a wide range of apparent BET surface areas can be easily obtained just by changing the preparation variables. As will be discussed in Section V, ACs with a high packing density and good mechanical properties are required in several applications.
36 shows the breakthrough curves for two thermally treated samples (AT and FT). Both samples have the same N2 micropore volume. Interestingly, their narrow micropore volumes (assessed by CO2 adsorption at 273 K) can explain why sample FT has higher VOC uptake than sample AT. To confirm this finding, a large series of ACs has been used to correlate their VOC retention capacities with their textural properties [107–109,139]. 36. It includes the porous characterization of commercial samples developed for removal of hydrocarbons as well as of ACs prepared by different activation methods and activating agents.
T emperatures (600–800°C), the peaks correspond to sodium carbonate. , horizontal or vertical). The presence of Co, not relevant for the discussion in this chapter, originated from the preparatory process of the MWCNT [72,101]. Thus, both FTIR and in situ XRD results lead to the same conclusion: carbon activation with alkaline hydroxides involves a reaction in which the hydroxide (NaOH or KOH) is converted to a carbonate. In addition, XRD shows that the metal (Na or K) is also formed at the highest temperature.
Chemistry and Physics of Carbon, Vol. 30 by Ljubisa R. Radovic