Dissertation
UNDERSTANDING THE BIMETALLIC CATALYST SURFACE IN THE PRESENCE OF WATER IN BIOMASS CONVERSION
Doctor of Philosophy (PhD), Washington State University
01/2015
Handle:
https://hdl.handle.net/2376/118371
Abstract
Biomass conversion via aqueous-phase catalytic processing has received increasing research interests. In this work, glycerol is chosen as a model compound because of its molecular structure with all the functional groups of interest. Steam reforming and aqueous-phase reforming are studied to understand the roles of rhenium in platinum-rhenium bimetallic catalyst. It is shown that addition of rhenium can enhance the catalytic activity in both cases and, particularly, to shift the APR reaction pathway towards dehydration. Surface characterizations of Pt and Pt-Re catalysts show that CO desorption from Pt-Re/C is more facile than that from Pt/C after steam and condensed water treatments. Oxidized rhenium species are formed and are responsible for the spillover of CO from neighboring Pt to achieve higher activity. Well-dispersed Re oxide species in close proximity with Pt can provide acid functionality for the dehydration pathway. Glycerol adsorption on model Pt and Pt-Re catalysts are also examined for mechanistic understanding. Prominent decrease in the ratio of the intensity between CH2 symmetric stretching and Fermi resonance modes upon adsorption of glycerol on Pt model catalyst surface indicates the high tendency of glycerol dehydrogenation to glyceraldehyde; glycerol dehydration to hydroxyacetone via Lewis acid-catalyzed dehydration pathway is implied on the Pt-Re model catalyst surface by the appearance of CH3 asymmetric stretching mode.
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Details
- Title
- UNDERSTANDING THE BIMETALLIC CATALYST SURFACE IN THE PRESENCE OF WATER IN BIOMASS CONVERSION
- Creators
- Zhehao Wei
- Contributors
- Yong Wang (Advisor)Charles HF Peden (Committee Member)Richard Zollars (Committee Member)Su Ha (Committee Member)Hong-Fei Wang (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Chemical Engineering and Bioengineering, School of
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Number of pages
- 124
- Identifiers
- 99900581732401842
- Language
- English
- Resource Type
- Dissertation