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Graphite, adsorption

Consider two apolar compounds exhibiting a factor of 10 difference in liquid vapor pressures. What differences do you expect for the two compounds in their (a) air-Teflon, and (b) air-graphite adsorption coefficients ... [Pg.450]

Eigure 5.6 shows an isotherm obtained from nitrogen absorption measurements of TIMREX SEG44, which is a typical highly crystalhne graphite. The shape of the graphite adsorption isotherm according to the Brunauer, Emmet, and Teller theory as well as... [Pg.126]

Asada, H. Seiyama, H., and Takechi, M.. Displacement transition in methane/cyclohexane adsorbed on graphite, Adsorpt. Sci. Technol., 15(4), 271-276 (1997). [Pg.1029]

Fig. XVII-18. Contours of constant adsorption energy for a krypton atom over the basal plane of graphite. The carbon atoms are at the centers of the dotted triangular regions. The rhombuses show the unit cells for the graphite lattice and for the commensurate adatom lattice. (From Ref. 8. Reprinted with permission from American Chemical Society, copyright 1993.)... Fig. XVII-18. Contours of constant adsorption energy for a krypton atom over the basal plane of graphite. The carbon atoms are at the centers of the dotted triangular regions. The rhombuses show the unit cells for the graphite lattice and for the commensurate adatom lattice. (From Ref. 8. Reprinted with permission from American Chemical Society, copyright 1993.)...
Fig. XVII-21. Continued) (c) Isosteric heats of adsorption of n-hexane on ice powder Vm = 0.073 cm STP. (From Ref. 125). (d) Isosteric heats of adsorption of Ar on graphitized carbon black having the indicated number of preadsorbed layers of ethylene. (From Ref. 126.)... Fig. XVII-21. Continued) (c) Isosteric heats of adsorption of n-hexane on ice powder Vm = 0.073 cm STP. (From Ref. 125). (d) Isosteric heats of adsorption of Ar on graphitized carbon black having the indicated number of preadsorbed layers of ethylene. (From Ref. 126.)...
Fig. XVII-22. Isosteric heats of adsorption for Kr on graphitized carbon black. Solid line calculated from isotherms at 110.14, 114.14, and 117.14 K dashed line calculated from isotherms at 122.02, 125.05, and 129.00 K. Point A reflects the transition from a fluid to an in-registry solid phase points B and C relate to the transition from the in-registry to and out-of-registry solid phase. The normal monolayer point is about 124 mol/g. [Reprinted with permission from T. P. Vo and T. Fort, Jr., J. Phys. Chem., 91, 6638 (1987) (Ref. 131). Copyright 1987, American Chemical Society.]... Fig. XVII-22. Isosteric heats of adsorption for Kr on graphitized carbon black. Solid line calculated from isotherms at 110.14, 114.14, and 117.14 K dashed line calculated from isotherms at 122.02, 125.05, and 129.00 K. Point A reflects the transition from a fluid to an in-registry solid phase points B and C relate to the transition from the in-registry to and out-of-registry solid phase. The normal monolayer point is about 124 mol/g. [Reprinted with permission from T. P. Vo and T. Fort, Jr., J. Phys. Chem., 91, 6638 (1987) (Ref. 131). Copyright 1987, American Chemical Society.]...
Such isothemis are shown in figure B 1,26.4 for the physical adsorption of krypton and argon on graphitized carbon black at 77 K [13] and are examples of type VI isothemis (figure B 1.26.3 ). Equation (B1.26.7)) further... [Pg.1872]

Figure Bl.26.4. The adsorption of argon and krypton on graphitized carbon black at 77 K (Eggers D F Jr, Gregory N W, Halsey G D Jr and Rabinovitch B S 1964 Physical Chemistry (New York Wiley) eh 18). Figure Bl.26.4. The adsorption of argon and krypton on graphitized carbon black at 77 K (Eggers D F Jr, Gregory N W, Halsey G D Jr and Rabinovitch B S 1964 Physical Chemistry (New York Wiley) eh 18).
Fisher A J and Bldchl P E 1993 Adsorption and scanning-tunneling-microscope Imaging of benzene on graphite and M0S2 Phys. Rev. Lett. 70 3263-6... [Pg.2232]

Similar results with graphitized carbon blacks have been obtained for the heat of adsorption of argon,krypton,and a number of hydrocarbons (Fig. 2.12). In all these cases the heat of adsorption falls to a level only slightly above the molar heat of condensation, in the vicinity of the point where n = n . [Pg.58]

Fig. 2.12 Plot of the calorimetric difTeFential enthalpy of adsorption A h) against amount adsorbed (n), for (u) n-pentane, (f)) /i-hexane, (c) n-heptane, d) n-octane, all adsorbed on graphitized car n black. The point corresponding to n = is marked on each curve. (Courtesy Kiselev.)... Fig. 2.12 Plot of the calorimetric difTeFential enthalpy of adsorption A h) against amount adsorbed (n), for (u) n-pentane, (f)) /i-hexane, (c) n-heptane, d) n-octane, all adsorbed on graphitized car n black. The point corresponding to n = is marked on each curve. (Courtesy Kiselev.)...
Specific surface area of carbon blacks before and after graphitization, determined by electron microscopy (A,) end by nitrogen adsorption (A ]t... [Pg.64]

Fig. 2.22 Adsorption isotherms of argon on graphitized carbon black at a number of temperatures," plotted as fractional coverage 0 against relative pressure p/p°. (Courtesy Prenzlow and Halsey.)... Fig. 2.22 Adsorption isotherms of argon on graphitized carbon black at a number of temperatures," plotted as fractional coverage 0 against relative pressure p/p°. (Courtesy Prenzlow and Halsey.)...
Fig. 2.23 Adsorption isotherms on graphitized carbon black at 77 K. (A) argon (B) krypton. (Courtesy Dash.)... Fig. 2.23 Adsorption isotherms on graphitized carbon black at 77 K. (A) argon (B) krypton. (Courtesy Dash.)...
Fig. 2.29 Comparison of nitrogen adsorption at 78 K on a carbon black (Sterling FT) before and after graphitization (a) The amount adsorbed on the ungraphitized sample plotted against the amount x, adsorbed on the graphitized sample, at the same pressure, b) The corresponding isotherms O, adsorption, , desorption on the ungraphitized sample (4 runs) A. adsorption A desorption, on the graphitized sample (4 runs). Fig. 2.29 Comparison of nitrogen adsorption at 78 K on a carbon black (Sterling FT) before and after graphitization (a) The amount adsorbed on the ungraphitized sample plotted against the amount x, adsorbed on the graphitized sample, at the same pressure, b) The corresponding isotherms O, adsorption, , desorption on the ungraphitized sample (4 runs) A. adsorption A desorption, on the graphitized sample (4 runs).
Fig. 3.Z3 Adsorption isotherm of n-butane at 273 K on a sample of artificial graphite ball-milled for 192 b. The shoulder F appeared at a relative pressure which was the same for all six samples in the first milling run, all six in the second milling run, and also for two of the milled samples which had been compacted. The milling time varied between 0 and 1024 h, and the BET-nilrogen areas of the surfaces between 9 and 610 m g ... Fig. 3.Z3 Adsorption isotherm of n-butane at 273 K on a sample of artificial graphite ball-milled for 192 b. The shoulder F appeared at a relative pressure which was the same for all six samples in the first milling run, all six in the second milling run, and also for two of the milled samples which had been compacted. The milling time varied between 0 and 1024 h, and the BET-nilrogen areas of the surfaces between 9 and 610 m g ...

See other pages where Graphite, adsorption is mentioned: [Pg.237]    [Pg.170]    [Pg.45]    [Pg.7]    [Pg.440]    [Pg.328]    [Pg.237]    [Pg.170]    [Pg.45]    [Pg.7]    [Pg.440]    [Pg.328]    [Pg.415]    [Pg.477]    [Pg.621]    [Pg.634]    [Pg.638]    [Pg.647]    [Pg.315]    [Pg.1757]    [Pg.1872]    [Pg.457]    [Pg.12]    [Pg.57]    [Pg.59]    [Pg.64]    [Pg.70]    [Pg.70]    [Pg.72]    [Pg.75]    [Pg.79]    [Pg.80]    [Pg.87]    [Pg.91]    [Pg.91]    [Pg.100]    [Pg.103]    [Pg.156]   
See also in sourсe #XX -- [ Pg.46 ]




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