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Title: Kinetics of hydrogen isotope exchange in β-phase Pd-H-D

Journal Article · · Journal of Physical Chemistry. C
 [1];  [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
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Hydrogen isotope gas exchange within palladium powders is examined using a batch-type reactor coupled to a residual gas analyzer (RGA). Furthermore, the exchange rates in both directions (H2 + PdD and D2 + PdH) are measured in the temperature range 178–323 K for the samples with different particle sizes. The results show this batch-type exchange is closely approximated as a first-order kinetic process with a rate directly proportional to the surface area of the powder particles. An exchange rate constant of 1.40 ± 0.24 μmol H2/atm cm2 s is found for H2 + PdD at 298 K, 1.4 times higher than that for D2 + PdH, with an activation energy of 25.0 ± 3.2 kJ/mol H for both exchange directions. Finally, a comparison of exchange measurement techniques shows these coefficients, and the fundamental exchange probabilities are in good agreement with those obtained by NMR and flow techniques.

Research Organization:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1235301
Report Number(s):
SAND-2015-4492J; 590571
Journal Information:
Journal of Physical Chemistry. C, Vol. 119, Issue 32; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

References (11)

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Some Thermodynamic Properties of the H 1 H 2 , H 2 H 2 Molecules and Compounds Containing the H 2 Atom journal February 1933
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Role of molecular diffusion in the theory of gas flow through crimped-capillary leaks journal May 2003

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Calcium Hydride Cation [CaH] + Stabilized by an NNNN-type Macrocyclic Ligand: A Selective Catalyst for Olefin Hydrogenation journal August 2017
Molecular Calcium Hydride: Dicalcium Trihydride Cation Stabilized by a Neutral NNNN-Type Macrocyclic Ligand journal March 2016

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