Supported Rh catalysts have been developed for selective H2 production at low temperatures. Ethanol dehydration is favorable over either acidic or basic supports such as γ-Al2O3 and MgAl2O4, while ethanol dehydrogenation is more favorable over neutral supports. CeO2-ZrO2-supported Rh catalysts were found to be especially effective for hydrogen production. We focused on a support prepared by a co-precipitation method having composition Ce 0.8Zr0.2O2. A 2%Rh/Ce0.8Zr 0.2O2 catalyst, prepared via impregnation without pre-calcination of support, exhibited the highest H2 yield at 450°C among various supported Rh catalysts evaluated in this study. This may be due to both the strong interaction between Rh and Ce0.8Zr 0.2O2 and the high oxygen transfer rate favoring reforming of acetaldehyde instead of methane production.
Bibliographical noteFunding Information:
This work was supported by Department of Energy’s Office of Hydrogen, Fuel Cells, and Infrastructure Technologies. Most of work was performed in the Environmental Molecular Science Laboratory, a national scientific user facility sponsored by the US Department of Energy’s Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory in Richland, WA.
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