Hydrogen production from ethanol over Pd–Rh/CeO2 with a metallic membrane reactor

[Display omitted] ► Pd–Rh over cerium oxide catalyst for hydrogen generation by ethanol steam reforming. ► Pd–Ag composite metallic membranes were used to separate a pure hydrogen stream. ► Up to 0.4L hydrogen permL liquid ethanol in feed and gram catalyst. ► Hydrogen recuperations of +70% were meas...

Full description

Saved in:
Bibliographic Details
Published in:Catalysis today 2012-10, Vol.193 (1), p.145-150
Main Authors: López, Eduardo, Divins, Nuria J., Llorca, Jordi
Format: Article
Language:English
Subjects:
Biocombustibles
Bioreactors
Energies
Ethanol
Hidrògen com a combustible
Hydrogen
Pd-Ag membrane
Recursos energètics renovables
Steam reforming
Àrees temàtiques de la UPC
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:[Display omitted] ► Pd–Rh over cerium oxide catalyst for hydrogen generation by ethanol steam reforming. ► Pd–Ag composite metallic membranes were used to separate a pure hydrogen stream. ► Up to 0.4L hydrogen permL liquid ethanol in feed and gram catalyst. ► Hydrogen recuperations of +70% were measured. ► Optimal operating conditions: T ca. 650°C, pressures 9–11bar, S/C=1.6 (water slightly over-stoichiometric). The present paper reports on experimental results of an ethanol reformer equipped with a Pd-based metallic membrane toward the production of pure hydrogen, suited for PEM-fuel cell feeding. The ethanol steam reforming is conducted using a Pd–Rh/CeO2 catalyst over cordierite monoliths, which were implemented in-series into a stainless-steel membrane reactor. Inconel membranes functionalized with Pd–Ag over an adequate support were profited for hydrogen separation from the monoliths outlet. The unit was successfully tested for hydrogen production from ethanol steam reforming, achieving pure-hydrogen flowrates up to 110mLN/min. Reaction yields of 3.1mol hydrogen generated per mol ethanol in feed and total yields of 1.4mol H2 permeated per mol ethanol in feed were measured, with maximum hydrogen recuperation of 70%. We discuss here the influence of the different operation parameters, as temperature, reaction (retentate) pressure, load and/or composition of the feed on the device performance. Temperatures of ca. 650°C, retentate pressures of 9–11bar and water contents in feed slightly over-stoichiometric revealed optimal for the unit operation.
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2012.06.030