Heats of xenon adsorption on Nax zeolite at high pressures and various temperatures

The heats of xenon adsorption on zeolite NaX at 299–467 K and 0–21 MPa were measured on a Tian-Calvet differential calorimeter. A significant temperature dependence of the heats measured at high occupancies of the adsorption surface was demonstrated.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 223–226, January, 1991.     

Calorimetric studies of adsorption of aromatic hydrocarbons on silicalite

Conclusions Complex relationships between the differential adsorption heats and the degree of filling are observed when benzene and toluene are adsorbed on silicalite. A possible reason for this phenomenon is either a redistribution or a reorientation of the adsorbed molecules when the degree of filling exceeds 0.5.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2820–2823, December, 1982.The authors express their gratitude to Dr. Fahlke for synthesizing and supplying the silicalite sample.     

Dealuminierte Molekularsiebe vom Typ Y Bestimmung des Mikro- und Sekundärporenvolumens durch Adsorptionsmessungen

Dealuminated Molecular Sieves of Y Type. Evaluation of Micro and Secundary Pore Volumes by Adsorption Measurements Isotherms of n-pentane, n-hexane, benzene, and nitrogen are measured in zeolite NaY and its dealuminated form (US-Ex), a molecular sieve that contains 99% SiO₂. From these results follows that US-Ex is bidispers. The dealumination forms a system of secundary pores with radii in the range of 1.5–1.9 nm. Evaluating the volumes of the micro- and secundary pores it was shown, that the micropore volume of US-Ex amounts to 75% compared with zeolite NaY. The mechanism of the dealumination reaction is discussed.     

Inter- and intramolecular hydroacylation of alkenes employing a bifunctional catalyst system

Based on a conceptually innovative bifunctional P,N ligand, an efficient protocol for the rhodium-catalyzed inter- and intramolecular hydroacylation of alkenes has been developed.