Methanol steam reforming over Pd/ZnO and Pd/CeO2 catalysts
- 10 August 2005
- journal article
- Published by Elsevier BV in Applied Catalysis A: General
- Vol. 289 (2), 153-162
- https://doi.org/10.1016/j.apcata.2005.04.022
Abstract
The goal of work described in this paper was to better understand the methanol steam reforming (MSR) activity and selectivity patterns of ZnO and CeO2 supported Pd catalysts. This reaction is being used to produce H2-rich gas for a number of applications including hydrogen fuel cells. The Pd/ZnO catalysts had lower MSR rates but were more selective for the production of CO2 than the Pd/CeO2 catalysts. The CH3OH conversion rates were proportional to the H2 chemisorption uptake suggesting that the rate determining step was catalyzed by Pd. The corresponding turnover frequencies averaged 0.8 ± 0.3 s−1 and 0.4 ± 0.2 s−1 at 230 °C for the Pd/ZnO and Pd/CeO2 catalysts, respectively. The selectivities are explained based on the reaction pathways, and characteristics of the support. The key surface intermediate appeared to be a formate. The ZnO supported catalysts had a higher density of acidic sites and favored pathways where the intermediate was converted to CO2 while the CeO2 supported catalysts had a higher density of basic sites and favored the production of CO.Keywords
This publication has 43 references indexed in Scilit:
- Production of hydrogen for fuel cells by steam reforming of methanol on Cu/ZrO2/Al2O3 catalystsFuel Processing Technology, 2003
- New Material Needs for Hydrocarbon Fuel Processing: Generating Hydrogen for the PEM Fuel CellAnnual Review of Materials Research, 2003
- Production of hydrogen by steam reforming of methanol on CeO2 promoted Cu/Al2O3 catalystsJournal of Molecular Catalysis A: Chemical, 2003
- Microfuel processor for use in a miniature power supplyJournal of Power Sources, 2002
- Steam Reforming of Methanol on Copper Catalysts Supported on Large-Surface-Area ZnAl2O3Catalysis Letters, 2002
- Hydrogen generation by steam reforming of methanol over copper-based catalysts for fuel cell applicationsInternational Journal of Hydrogen Energy, 2001
- Methanol reforming for fuel-cell applications: development of zirconia-containing Cu–Zn–Al catalystsCatalysis Today, 1999
- Methanol–steam reforming on Cu/ZnO/Al2O3. Part 1: the reaction networkApplied Catalysis A: General, 1999
- Production of Hydrogen from Methanol over Promoted Coprecipitated Cu-Al Catalysts: The Effects of Various Promoters and Catalyst Activation MethodsIndustrial & Engineering Chemistry Research, 1995
- Production of Hydrogen from Methanol. Part 1. Catalyst Characterization StudiesIndustrial & Engineering Chemistry Research, 1994