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CoX zeolites and their exchange with deuterium

Journal Article:

Abstract

An analysis of the gaseous phase using a mass spectrometer and analysis of the solid phase using an infrared spectrophotometer was made to investigate the deuterium exchange with hydrogen mostly bound in hydroxyl groups of zeolites CoX(21 and 47%) and NaX. It was found that with the increasing amount of cobalt ions the number of exchangeable hydrogens of the zeolite increases; the respective types of the hydrogen are discussed with respect to the particular dehydration temperatures. The rate of the D/sub 2/+OH exchange is substantially faster with the CoX than with the NaX zeolite, and exhibits a decrease with increasing dehydration. On the other hand, the rate of D/sub 2/+H/sub 2/ exchange without zeolite hydrogen incorporation, catalyzed by CoX zeolites, increases with increasing dehydration. The increased activation of gaseous hydrogen molecules is related to the presence in the zeolite of cobalt ions whose properties change during dehydration with the change in their environment. Hydroxyl groups of the CoX zeolites are not equivalent during the exchange; the hydroxyl hydrogens of the 3740 cm/sup -1/ band are exchanged more slowly than are the other hydrogens.
Authors:
Novakova, J; Kubelkova, L; Jiru, P [1] 
  1. Ceskoslovenska Akademie Ved, Prague. Ustav Fyzikalni Chemie
Publication Date:
Apr 01, 1976
Product Type:
Journal Article
Reference Number:
AIX-08-282985; EDB-77-056293
Resource Relation:
Journal Name: Collect. Czech. Chem. Commun.; (Czechoslovakia); Journal Volume: 41:4
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; DEUTERIUM; ISOTOPIC EXCHANGE; CATALYSIS; CHEMICAL REACTION KINETICS; COBALT COMPOUNDS; DEHYDRATION; DEUTERIUM COMPOUNDS; HIGH TEMPERATURE; HYDROGEN; HYDROGEN COMPOUNDS; INFRARED SPECTRA; SODIUM COMPOUNDS; TEMPERATURE DEPENDENCE; ZEOLITES; ALKALI METAL COMPOUNDS; CRYOGENIC FLUIDS; ELEMENTS; FLUIDS; HYDROGEN ISOTOPES; INORGANIC ION EXCHANGERS; ION EXCHANGE MATERIALS; ISOTOPES; KINETICS; LIGHT NUCLEI; MINERALS; NONMETALS; NUCLEI; ODD-ODD NUCLEI; REACTION KINETICS; SPECTRA; STABLE ISOTOPES; TRANSITION ELEMENT COMPOUNDS; 400203* - Isotope Exchange & Isotope Separation- (-1987)
OSTI ID:
7230653
Country of Origin:
Serbia and Montenegro
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: CCCCA
Submitting Site:
INIS
Size:
Pages: 968-977
Announcement Date:

Journal Article:

Citation Formats

Novakova, J, Kubelkova, L, and Jiru, P. CoX zeolites and their exchange with deuterium. Serbia and Montenegro: N. p., 1976. Web.
Novakova, J, Kubelkova, L, & Jiru, P. CoX zeolites and their exchange with deuterium. Serbia and Montenegro.
Novakova, J, Kubelkova, L, and Jiru, P. 1976. "CoX zeolites and their exchange with deuterium." Serbia and Montenegro.
@misc{etde_7230653,
title = {CoX zeolites and their exchange with deuterium}
author = {Novakova, J, Kubelkova, L, and Jiru, P}
abstractNote = {An analysis of the gaseous phase using a mass spectrometer and analysis of the solid phase using an infrared spectrophotometer was made to investigate the deuterium exchange with hydrogen mostly bound in hydroxyl groups of zeolites CoX(21 and 47%) and NaX. It was found that with the increasing amount of cobalt ions the number of exchangeable hydrogens of the zeolite increases; the respective types of the hydrogen are discussed with respect to the particular dehydration temperatures. The rate of the D/sub 2/+OH exchange is substantially faster with the CoX than with the NaX zeolite, and exhibits a decrease with increasing dehydration. On the other hand, the rate of D/sub 2/+H/sub 2/ exchange without zeolite hydrogen incorporation, catalyzed by CoX zeolites, increases with increasing dehydration. The increased activation of gaseous hydrogen molecules is related to the presence in the zeolite of cobalt ions whose properties change during dehydration with the change in their environment. Hydroxyl groups of the CoX zeolites are not equivalent during the exchange; the hydroxyl hydrogens of the 3740 cm/sup -1/ band are exchanged more slowly than are the other hydrogens.}
journal = {Collect. Czech. Chem. Commun.; (Czechoslovakia)}
volume = {41:4}
journal type = {AC}
place = {Serbia and Montenegro}
year = {1976}
month = {Apr}
}