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 of this device using CO conversion, hydrogen recovery and H2 production as parameters. The membrane reactor experiments were performed between 673 and 723 K 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. © 2013 Elsevier B.V. All rights reserved.
Novel catalyst for the WGS reaction in a Pd-membrane reactor
Sansovini, M.;Tosti, S.
2013-01-01
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 of this device using CO conversion, hydrogen recovery and H2 production as parameters. The membrane reactor experiments were performed between 673 and 723 K 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. © 2013 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
