Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 36, Issue 6, Pages 3827-3834Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2010.02.079
Keywords
Glycerol steam reforming; Pd-Ag membrane; CO-free hydrogen; PEM fuel cell
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Glycerol as a byproduct of biodiesel production represents a renewable energy source. In particular, glycerol can be used in the field of hydrogen production via gas phase reforming for proton exchange membrane fuel cell (PEMFC) applications. In this work, glycerol steam reforming (GSR) reaction was investigated using a dense palladium-silver membrane reactor (MR) in order to produce pure (or at least CO-free) hydrogen, using 0.5 wt% Ru/Al2O3 as reforming catalyst. The experiments are performed at 400 degrees C, water to glycerol molar feed ratio 6:1, reaction pressure ranging from 1 to 5 bar and weight hourly space velocity (WHSV) from 0.1 to 1.0 h(-1). Moreover, a comparative study is given between the Pd-Ag MR and a traditional reactor (TR) working at the same MR operating conditions. The effect of the WHSV and reaction pressure on the performances of both the reactors in terms of glycerol conversion and hydrogen yield is also analyzed. The MR exhibits higher conversion than the TR (similar to 60% as best value for the MR against similar to 40% for the TR, at WHSV = 0.1 h(-1) and 5 bar), and high CO-free hydrogen recovery (around 60% at WHSV = 0.1 h(-1) and 5 bar). During reaction, carbon coke is formed limiting the performances of the reactors and inhibiting, in particular, the hydrogen permeation through the membrane with a consequent reduction of hydrogen recovery in the permeate side. Copyright (C) 2009, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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