1. The sorption by porous solid of gas under constant pressure and temperature proceeds, generally, in two stages. The mechanisms of sorption of each stage are described. 2. The velocity of the former stage is expressed by the equation (Remark: Graphics omitted.) where x denotes the amount of gas sorbed at time t, and K, s and n are constants. In the simplest case where n=1, this equation is integrated in the following form, (Remark: Graphics omitted.) 3. The velocity of the latter stage of sorption is expressed by x-a logt=k where α and k are constants.
(1) The potentiometric titrations of potassium and sodium ferrocyanide with mercuric chloride, nickel sulphate and cobaltous sulphate by using platinum electrode as an indicator electrode were studied at 25°C. (2) From the above titration we found that the reactions take place as follows. 2Hg^+++Fe(CN)_6^-— &=Hg_2Fe(CN)_6 2Ni^+++Fe(CN)_6^-— &=Ni_2Fe(CN)_6 2Co^+++Fe(CN)_6^-— &=Co_2Fe(CN)_6
(3) Also the potentiometric titrations were compared with potassium and sodium ferrocyanides by ferric chloride and silver nitrate solution at the same condition or different conditions, and a very good agreement was found with each other. (4) In this titration we found that the reaction takes place as reported already by Niemz(1) at the case of silver and in other case as follows: & 4Ag^++Fe(CN)_6^-—=Ag_4Fe(CN)_6 & 4Fg^++++3Fe(CN)_6^-—=Fe_4[Fe(CN)_6]_3
1. In the study of the hydrogenation of acetylene in presence of nickel and palladium catalysts distributed on kieselguhr, it was observed that markedly selective action of catalysts was produced by the variation of the dispersity of the catalytic agents on kieselguhr. The phenomenon which was met with, suggests a possible mechanism of one case of promoter and carrier actions and on the other hand, a method of hydrogenation of acetylene to ethylene. 2. With regard to the simple hydrogenation process, in presence of a metallic catalyst, inert irreducible oxides being employed as the promoter and as the carrier, stimulation and restriction of the catalytic activity can be explained on the basis of the assumed co-activation of active centres on the catalytic surface by the heat of reaction. 3. Acetylene was readily hydrogenated to ethylene by the employment of the palladium-kieselguhr catalysts of proper dispersity. With equal volumes of acetylene and hydrogen, the product containing more than 90 per cent, ethylene, was obtained.
The heating rate and the volume dilatation of nitrobenzene have been measured between 8° and 11°C. and the refractive index between 7° and 20°C. The density of nitrobenzene is d204=1.2030, and the refractive index for Hα line is given by the equation. n_c=1.555030–0.000455 t. The heating curve of carbon bisulphide has been measured between −100° and −85°C. No arrest in the heating curves, no distinct change of the slope in the dilatation curve and no distinct change in the value of the refractive index have been observed within the range of the observed temperatures. Two layers in liquid carbon bisulphide at −90°C. could not be observed. None of these results proves the existence of the two modifications of the liquid nitrobenzene and carbon bisulphide such as suggested by Wolfke and Mazur.