RT Journal Article
T1 Effect of Au addition on hydrogen permeation and the resistance to H2S on Pd-Ag alloy membranes
A1 Melendez, Jon
A1 de Nooijer, Niek
A1 Coenen, Kai
A1 Fernandez, Ekain
A1 Viviente, Jose Luis
A1 van Sint Annaland, Martin
A1 Arias, P. L.
A1 Tanaka, D. A.Pacheco
A1 Gallucci, Fausto
AB In order to make a detailed comparison between Pd-Ag and Pd-Ag-Au membranes according to their H2 permeation properties and sulfide resistance Au was deposited by the electroless plating (ELP) technique onto one half of Pd-Ag membranes. Membranes' thicknesses are ranged between 2.45 and 3.13 µm. Permeation tests have been carried out from 400 to 600 °C under single gas conditions. The Pd91.7Ag4.8Au3.5 membrane has shown a H2 permeance of 4.71·10−3 mol s−1 m−2 Pa0.5 at 600 °C, which is one of the highest values ever reported in the literature, where the Pd-Ag-Au membranes have exhibited higher hydrogen permeation rates compared to their respective Pd-Ag membranes above 550 °C. The H2 permeation properties have been determined in terms of the degree of H2S inhibition, up to 17 ppm, and subsequent H2 flux recovery rate. Pd-Ag membranes alloyed with gold resisted 12.5 h of H2S exposure showing recovery rates of 85% and 83% for Pd91.5Ag4.7Au3.8 and Pd90.5Ag4.6Au4.9 membranes, respectively, whereas the hydrogen flux of non-gold membranes decreased below detectable values. H2/N2 ideal perm-selectivity of the Pd-Ag membrane was reduced to 18 after H2S tests (starting from > 1308) while Pd-Ag-Au membranes showed a better resistance to sulfur with H2/N2 selectivity values of 793 and 121 (starting from > 4115 and > 2557 respectively). No evidence of the formation of a crystalline sulfide phase on the Pd-Ag-Au alloy membrane surfaces was found in the XRD patterns after H2S exposure and also XPS characterization did not show important changes in the composition before and after the H2S exposure tests. However, SEM images showed a decrease in the thickness of the Pd-Ag membrane and signs of corrosion and roughening on its surface, while gold-alloyed membranes did not show any damage.
SN 0376-7388
YR 2017
FD 2017
LK https://hdl.handle.net/11556/3242
UL https://hdl.handle.net/11556/3242
LA eng
NO Melendez , J , de Nooijer , N , Coenen , K , Fernandez , E , Viviente , J L , van Sint Annaland , M , Arias , P L , Tanaka , D A P & Gallucci , F 2017 , ' Effect of Au addition on hydrogen permeation and the resistance to H 2 S on Pd-Ag alloy membranes ' , Journal of Membrane Science , vol. 542 , pp. 329-341 . https://doi.org/10.1016/j.memsci.2017.08.029
NO Publisher Copyright: © 2017 Elsevier B.V.
DS TECNALIA Publications
RD 28 jul 2024