On the state of ammonia in the adsorbed phase

The NMR spectra of ammonia adsorbed on silica gel treated at 200 ° and 700 °C and on zeolite (NaX) heated at 77–300 °K have been studied. The dependence of the line width and the second moment on coverage has been measured. It has been shown that the surface of silica gel is inhomogeneous and ammoni...

Full description

Saved in:
Bibliographic Details
Published inJournal of catalysis Vol. 13; no. 3; pp. 255 - 260
Main Authors Kvlividze, V.I., Brants, R.A., Kisselev, V.F., Bliznakov, G.M.
Format Journal Article
LanguageEnglish
Published Elsevier Inc 01.01.1969
Online AccessGet full text

Cover

More Information
Summary:The NMR spectra of ammonia adsorbed on silica gel treated at 200 ° and 700 °C and on zeolite (NaX) heated at 77–300 °K have been studied. The dependence of the line width and the second moment on coverage has been measured. It has been shown that the surface of silica gel is inhomogeneous and ammonia adsorption proceeds on different types of centers. The phase transition with melting has been observed on NH 3 adsorbed on zeolite at T ≈ 145 °K (i.e., below the melting point of ammonia). The causes for the decrease in the melting point are considered.
ISSN:0021-9517
1090-2694
DOI:10.1016/0021-9517(69)90399-6