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Title: Hydrogen isotopic exchange over palladium metal

Abstract

We have recently developed the laser-Raman technique as a means of unambiguously measuring the partial pressures of all possible hydrogen isotopes in the gas phase. Using this technique we have investigated the hydrogen-deuterium exchange in a number of metals. This report presents detailed data for isotopic exchange in the palladium hydride system over the temperature range 26{degree}C to -100{degree}C at a pressure of 7 atm. First order kinetic rate constants and activation energies are summarized for the forward (hydride to deuteride) and reverse (deuteride to hydride) exchange processes. In addition, we have found that small amounts (100 ppm) of impurities in the exchange gases considerably slow the exchange kinetics with the effect increasing down the series CH{sub 4}, CO{sub 2}, H{sub 2}O, and CO. 9 refs., 4 figs., 1 tab.

Authors:
;
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
DOE/DP
OSTI Identifier:
6822912
Report Number(s):
LA-UR-90-1762; CONF-9009141-1
ON: DE90012063
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: International symposium on metal-hydrogen systems, Banff (Canada), 2-7 Sep 1990
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; DEUTERIUM; ISOTOPIC EXCHANGE; HYDROGEN; HYDRIDES; IMPURITIES; PALLADIUM; PARTIAL PRESSURE; ELEMENTS; HYDROGEN COMPOUNDS; HYDROGEN ISOTOPES; ISOTOPES; LIGHT NUCLEI; METALS; NONMETALS; NUCLEI; ODD-ODD NUCLEI; PLATINUM METALS; STABLE ISOTOPES; TRANSITION ELEMENTS; 400202* - Isotope Effects, Isotope Exchange, & Isotope Separation

Citation Formats

Carstens, D H.W., and Encinias, P D. Hydrogen isotopic exchange over palladium metal. United States: N. p., 1990. Web.
Carstens, D H.W., & Encinias, P D. Hydrogen isotopic exchange over palladium metal. United States.
Carstens, D H.W., and Encinias, P D. 1990. "Hydrogen isotopic exchange over palladium metal". United States. https://www.osti.gov/servlets/purl/6822912.
@article{osti_6822912,
title = {Hydrogen isotopic exchange over palladium metal},
author = {Carstens, D H.W. and Encinias, P D},
abstractNote = {We have recently developed the laser-Raman technique as a means of unambiguously measuring the partial pressures of all possible hydrogen isotopes in the gas phase. Using this technique we have investigated the hydrogen-deuterium exchange in a number of metals. This report presents detailed data for isotopic exchange in the palladium hydride system over the temperature range 26{degree}C to -100{degree}C at a pressure of 7 atm. First order kinetic rate constants and activation energies are summarized for the forward (hydride to deuteride) and reverse (deuteride to hydride) exchange processes. In addition, we have found that small amounts (100 ppm) of impurities in the exchange gases considerably slow the exchange kinetics with the effect increasing down the series CH{sub 4}, CO{sub 2}, H{sub 2}O, and CO. 9 refs., 4 figs., 1 tab.},
doi = {},
url = {https://www.osti.gov/biblio/6822912}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 1990},
month = {Mon Jan 01 00:00:00 EST 1990}
}

Conference:
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