Comparison of Pt and Pd catalysts for hydrogen pump separation from reformate
Release time:2019-03-09
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期刊论文
First Author:
Wu, Xuemei
Correspondence Author:
Benziger, J (reprint author), Princeton Univ, Dept Chem & Biol Engn, Princeton, NJ 08540 USA.
Co-author:
Benziger, Jay,He, Gaohong
Date of Publication:
2012-11-15
Journal:
JOURNAL OF POWER SOURCES
Included Journals:
SCIE、EI、Scopus
Document Type:
J
Volume:
218
Page Number:
424-434
ISSN No.:
0378-7753
Key Words:
Hydrogen purification; Electrochemical separations; Electrocatalyst
coated membranes
Abstract:
Hydrogen recovery from CO2/H-2 reformate mixtures by selective electrochemical pumping was compared from carbon supported Pt and Pd catalysts. Catalyst coated membranes were prepared by air-brushing a suspension of commercially available 20 wt% Pt/C or 20 wt% Pd/C catalysts and solubilized Nafion in methanol onto Nafion 115 membranes. Electrochemical activity and separation efficiency for the different catalyst layer formulations were evaluated by cyclic voltammetry, polarization and potentiostatic hydrogen pumping. The effective membrane-electrode-assembly (MEA) resistance increased due to dilution of H-2 by CO2; the effective MEA resistance was greater for Pd/C catalysts than for Pt/C catalysts. CO2 adsorbed more strongly to Pd catalysts than Pt catalysts reducing the electrochemical active surface area available for hydrogen oxidation/reduction. Pd/C catalysts had an energy efficiency for hydrogen recovery from reformate mixtures approximately 80% that of Pt catalysts. Because Pd is ten times less costly than Pt the results presented here suggest that Pd/C catalysts would be a promising candidate for hydrogen pumps to recover H-2 from reformate mixtures. (C) 2012 Elsevier B.V. All rights reserved.
Translation or Not:
no
