Novel catalyst for the WGS reaction in a Pd-membrane reactor

Authors: Carolina A. Cornaglia, Silvano Tosti, Mirko Sansovini, John Múnera, Eduardo A. Lombardo

Abstract:
A Pt/La₂O₃·SiO₂ catalyst was synthesized and tested in the WGS reaction. Kinetic measurements were carried out in a conventional fixed-bed reactor operated in differential mode while the stability test was conducted in integral regime. The fresh and used catalysts were characterized through XRD, XPS, Raman spectroscopy and H₂ chemisorption. The Pt(0.6 wt%)/La₂O₃(27 wt%)·SiO₂ catalyst showed high activity and WGS selectivity, no carbon formation and high stability. After use no changes were observed in the Pt dispersion. The catalyst was also tested in a tubular Pd-Ag membrane reactor in order to gauge the performance ofthis device using CO conversion, hydrogen recovery and H₂ production as parameters. The membrane reactor experiments were performed between 673 and 723K and at pressures ranging from 100 kPa to 800 kPa. The low methanation activity was monitored in all cases. Under the best operating conditions, a CO conversion of 98% and a hydrogen recovery of 90% were reached operating at 800 kPa in the retentate side, and at 100 kPa in the permeate side.

Keywords:
Pt catalyst
Stability
CH4 selectivity
H2 production
H2 purification

Published in: Applied catalysis A: General  (Volumes 462–463, Pages 1-310, 10 July 2013)

Publisher: Elsevier      

ISSN Information: 0926-860X

Novel catalyst for the WGS reaction in a Pd-membrane reactor

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