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Title: The hydrogen permeability of Pd4S

Abstract

Hydrogen permeates rapidly through pure Pd membranes, but H2S, a common minor component in hydrogencontaining streams, produces a Pd4S film on the Pd surface that severely retards hydrogen permeation. Hydrogen still permeates through the bi-layered Pd4S/Pd structure, indicating that the Pd4S surface is active for H2 dissociation; the low hydrogen permeability of the Pd4S film is responsible for the decreased rate of hydrogen transport. In this work, the hydrogen permeability of Pd4S was determined experimentally in the 623-773 K temperature range. Bi-layered Pd4S/Pd foils were produced by exposing pure Pd foils to H2S. H2 fluxes through the bi-layered Pd4S/Pd foils were measured during exposure to both pure H2 and a 1000 ppm H2S in H2 gas mixture. Our results show that H2S slows hydrogen permeation through Pd mainly by producing a Pd4S film on the Pd surface that is roughly an order-of-magnitude less permeable to hydrogen (kPd4S = 10-7.5 exp(-0.22 eV/kBT)molH2/m/s/Pa-1/2) than pure Pd. The presence of H2S in the gas stream results in greater inhibition of hydrogen transport than can be explained by the very low permeability of Pd4S. H2S may block H2 dissociation sites at the Pd4S surface.

Authors:
 [1];  [1];  [2];  [1]
  1. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept of Chemical Engineering
  2. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
Publication Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Org.:
USDOE Assistant Secretary for Fossil Energy (FE)
OSTI Identifier:
1015218
Report Number(s):
NETL-TPR-3192
Journal ID: ISSN 0376-7388
Resource Type:
Journal Article
Journal Name:
Journal of Membrane Science
Additional Journal Information:
Journal Volume: 371; Journal Issue: 1-2; Journal ID: ISSN 0376-7388
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; 36 MATERIALS SCIENCE

Citation Formats

O’Brien, Casey P., Gellman, Andrew J., Morreale, Bryan D., and Miller, James B. The hydrogen permeability of Pd4S. United States: N. p., 2011. Web. doi:10.1016/j.memsci.2011.01.044.
O’Brien, Casey P., Gellman, Andrew J., Morreale, Bryan D., & Miller, James B. The hydrogen permeability of Pd4S. United States. https://doi.org/10.1016/j.memsci.2011.01.044
O’Brien, Casey P., Gellman, Andrew J., Morreale, Bryan D., and Miller, James B. 2011. "The hydrogen permeability of Pd4S". United States. https://doi.org/10.1016/j.memsci.2011.01.044.
@article{osti_1015218,
title = {The hydrogen permeability of Pd4S},
author = {O’Brien, Casey P. and Gellman, Andrew J. and Morreale, Bryan D. and Miller, James B.},
abstractNote = {Hydrogen permeates rapidly through pure Pd membranes, but H2S, a common minor component in hydrogencontaining streams, produces a Pd4S film on the Pd surface that severely retards hydrogen permeation. Hydrogen still permeates through the bi-layered Pd4S/Pd structure, indicating that the Pd4S surface is active for H2 dissociation; the low hydrogen permeability of the Pd4S film is responsible for the decreased rate of hydrogen transport. In this work, the hydrogen permeability of Pd4S was determined experimentally in the 623-773 K temperature range. Bi-layered Pd4S/Pd foils were produced by exposing pure Pd foils to H2S. H2 fluxes through the bi-layered Pd4S/Pd foils were measured during exposure to both pure H2 and a 1000 ppm H2S in H2 gas mixture. Our results show that H2S slows hydrogen permeation through Pd mainly by producing a Pd4S film on the Pd surface that is roughly an order-of-magnitude less permeable to hydrogen (kPd4S = 10-7.5 exp(-0.22 eV/kBT)molH2/m/s/Pa-1/2) than pure Pd. The presence of H2S in the gas stream results in greater inhibition of hydrogen transport than can be explained by the very low permeability of Pd4S. H2S may block H2 dissociation sites at the Pd4S surface.},
doi = {10.1016/j.memsci.2011.01.044},
url = {https://www.osti.gov/biblio/1015218}, journal = {Journal of Membrane Science},
issn = {0376-7388},
number = 1-2,
volume = 371,
place = {United States},
year = {2011},
month = {4}
}