Adsorption of Gases on Surfaces of Powders and Metal Foils.

The Effect of Addition of Potash to Nickel Chromite Catalysts

“…Moreover, the use of air regeneration on the potash-promoted catalysts reduced its selectivity as is shown in the last two results in Table I. ( 6 ) Nickel Chromite with Potash Built I n This catalyst also would not display "wildness", but two other characteristics distinguished it from the catalyst with potash on the surface. The first is its behavior in the initial half hour of activity.…”

“…T o check that chemisorption was not occurring (5), the areas were remeasured with argon a t liquid oxygen temperatures. The values of 16.2 A2 and 15.0 h;2 were used for the cross-sectional areas of N2 and A respectively (6,7). The results of these measurements are given in Table 11, and the terms "oxidized" and "reduced" are discussed below.…”

Description of polymolecular adsorption on energetically heterogeneous surfaces

“…For example, as can be seen in Fig. 7, at the adsorption of С 6 Н 6 on sodium chloride [88], ССl 4 on clay [89] and Teflon [83], n С 4 Н 10 [10] on silver foil [29] and Iceland spar [90], n С 8 Н 18 [18] on cellulose [75], and water on polymethylmethacry late [91], MA equation describes the adsorption iso therms in a range of mono and polymolecular adsorption (up to P/P s = 0.8-0.9) of either kind II or III where both BET and point B methods are practi cally inapplicable.…”

“…The existence of a pressure range when, simulta neously, micropores are filled and the first adsorption layer is occupied is typical of such systems. This is reflected by a linear segment in isotherms, which begins at point В (а В ), that can be considered as a sum of the limiting adsorption in micropores and in the first layer [62]: (28) Then, the difference a -а В = δ beyond point B should correspond to the adsorption in the second and upper layers and can be approximated by the MA equation: (29) Restricting the consideration to the adsorption in three layers and using the TA equation for the occupa tion of the second and third layers, we come to the fol lowing expression [87]: (1,2) and Е 1 values were calculated according to Eqs. (16) and (19) based on and values correspond ing to the same standard adsorbates as in Table 4.…”

“…Adsorption isotherms of vapors on nonporous and macroporous adsorbents in the coordinates of the linearized DR equa tion: (1) С 2 Н 4 (173 K) on KSK 2[27], (2) C(CH 3 ) 4 (256 K) on polyvinylidene chloride[28], (3) n С 4 Н 10 (195 K) on silver foil[29], (4) Ar (78 R) on rutile[30], (5) С 6 Н (293 K) on alumogel[31], and (6) n С 6 Н 14 (293 K) on alumosilica gel[32].…”