Thesis
Fuel processing catalysis for microchannel applications: Methanol steam reforming and selective CO methanation
Washington State University
Master of Science (MS), Washington State University
2005
Handle:
https://hdl.handle.net/2376/327
Abstract
In agreement with previous works, Pd/ZnO catalysts have been demonstrated as being selective for the methanol steam reforming reaction, which is due to the unique nature of the PdZn alloy formation upon reduction conditions higher than >350C. The effects of crystallite size, use of high surface area alumina support, Pd:Zn ratio, and Pd loadings were shown to affect the activity and selectivity to the methanol steam reforming reaction. By using a 9%Pd/ZnO/Al2O3 catalyst, with a Pd:Zn ratio of 0.38, performance was found to be similar to that of a commercial CuZnAl catalyst. Unlike their CuZnAl counterpart, PdZnAl catalysts are stable at much higher temperatures, thus, the benefits of increased kinetics due to higher operating temperature are realized. Selective CO methanation as a strategy for CO removal in micro fuel processing applications was investigated over Ru-based catalysts. Ru loading, pretreatment and reduction conditions, and choice of support were shown to affect catalyst activity, selectivity, and stability. Even operating at a space-hourly-velocity as high as of 13,500 hr-1, a 3%Ru/Al2O3 catalyst was able to lower CO in a reformate to less than 100 ppm over a wide temperature range from 240 °C to 285 °C, while keeping hydrogen consumption of <10%.
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Details
- Title
- Fuel processing catalysis for microchannel applications
- Creators
- Robert Alexander Dagle
- Contributors
- Yong Wang (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Chemical Engineering and Bioengineering, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525289801842
- Language
- English
- Resource Type
- Thesis