. The Adsorption of Gases at Low and Moderate Concentrations. Part I. Deduction of the Theoretical Adsorption Isostere and Isotherm. Part II. Experimental Verification of the Form of the Theoretical Isosteres and Isotherms. that adsorbent, the only one here considered. Table IV. Ammonia (Kichardson*) a = 15. logp/T = 3*193 — 1628 temp. 130° C. u^ = 154. JL 4 P- p calc. 1 cm. 273 06 0*5 283 0*9 0*8 293 1-3 1*3 303 2*0 2-0 313 3*0 3-1 328 5 5 55 343 9*6 9*6 358 16-1 15*8 373 25-6 25*1 388 37*9 38*5 403 56*5 57 3 418 83*4 83*0 433 116 117 448 158 162 473 268 267 The observations on ammoni
. The Adsorption of Gases at Low and Moderate Concentrations. Part I. Deduction of the Theoretical Adsorption Isostere and Isotherm. Part II. Experimental Verification of the Form of the Theoretical Isosteres and Isotherms. that adsorbent, the only one here considered. Table IV. Ammonia (Kichardson*) a = 15. logp/T = 3*193 — 1628 temp. 130° C. u^ = 154. JL 4 P- p calc. 1 cm. 273 06 0*5 283 0*9 0*8 293 1-3 1*3 303 2*0 2-0 313 3*0 3-1 328 5 5 55 343 9*6 9*6 358 16-1 15*8 373 25-6 25*1 388 37*9 38*5 403 56*5 57 3 418 83*4 83*0 433 116 117 448 158 162 473 268 267 The observations on ammonia considered in Table IV are interestinginasmuch as most have been made at temperatures below the critical deviations at the lowest temperatures, though small, are apparentlysystematic and are emphasised in the isosteres for greater values of a, whichare presented in graphical form in fig. 2. The special case of the isostere of zero adsorption is considered in Part IIIwhere many examples are discussed in connection with the theoretical aspectof the constants A and B of the formula. * «Jour. Amer. Chem. Soc.,J vol. 39, p. 1828 (1917). Gases at Loiv and Moderate Concentrations, ±iuo *£-0 - 3o J2-0- I*. fO 30 Fig. % tArtimorujau *H) (b) The Adsorption Isotherms. As examples of the applicability of the formula (8) the cases below areselected from a mass of data and calculations. For comparison there are alsogiven the values calculated from the best values of the constants in the well-known exponential formula a = «o c i/ft in the form log a = log «o -f 1/n log c. 294 Dr. A. M. Williams. The Adsorption of Table V. Nitrogen at 0° 0. (Titoff*)Grit. temp. —146° 0. ot^ = 96. log ujp = 1 415 — 0*0143 ol (I).log a = 1-424+0*927 logp (II). jp. a Obs. a Calc. (I). a Calc. (II). CyOj.» 0-43 O 111 0*111 0*123 1-21 0*298 0-312 0*318 3-93 0*987 0*990 0*938 12*98 3*04 3*06 2*87 22*94 5*08 5*06 4*81 34-01 7*05 7*02 7*02 56*23 10 31 10*37 11*12 77*46 13*05 13*09 14*86
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