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Digitale Medien

Experimental research on specific volumes of rubidium and potassium vapors (1987)

Voljak, L. D. ; Nikitin, A. N. ; Stepanov, V. G.

Springer

International journal of thermophysics 8 (1987), S. 239-246

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ISSN: 1572-9567

Schlagwort(e): dosing device ; piezometer ; potassium ; PVT measurements ; rubidium ; specific volume ; superheated vapor

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Results are reported of an experimental study of superheated rubidium vapor in the temperature range 1450–2000 K and pressure range 1.7–5.2 MPa and potassium in the range 1500–2100 K and 1.4–4.0 MPa. The experiments have been performed with an apparatus adaoted to implement a modified constant-volume piezometer technique, where the sensing element of a pressure transducer represented by a diaphragm is placed in a low-temperature zone. A dosing device is described which permits the performance of accurate measurements of the mass of the metal in the piezometer chamber. The present results are in good agreement with those reported by other investigators in the overlaping temperature and pressure ranges.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00515206

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Digitale Medien

Interaction of aromatics with Brönsted sites in zeolites: Demarcation line between regions of stable existence of H-complexes and ion pairs for various types of bases (1998)

Paukshtis, E. A. ; Malysheva, L. V. ; Stepanov, V. G.

Springer

Reaction kinetics and catalysis letters 65 (1998), S. 145-152

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ISSN: 1588-2837

Schlagwort(e): Brönsted acid sites ; organic bases ; H-complexes ; ion pairs ; IR spectroscopy

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract Interaction of naphthalene, α-methylnaphthalene, and hexamethylbenzene with OH groups of SiO2, HNaY and H-ZSM-5 zeolites was studied by IR spectroscopy. The results are compared with data obtained for other types of organic bases. Specificity in the generation of H-complexes of olefins, arenes, naphthalenes, N- and O-bases with Brönsted surface sites was elucidated. Each type of base appears to have its particular correlation of (PAa-PAb) and the shift of ΔυOH band in H-complexes. It has been found that if (PAa-PAb) is less than 85±5 kcal/mol, the formation of ion pairs is thermodynamically more favorable than that of H-complexes for all types of organic compounds.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02475328

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