Thesis
Investigation of the properties of metal oxide catalysts for different catalytic reactions
Washington State University
Master of Science (MS), Washington State University
12/2015
Handle:
https://hdl.handle.net/2376/101237
Abstract
With the depletion of fossil feedstock and increased concerns for environment, biomass has been regarded as an important renewable energy resource. The technique of production of bio-ethanol and glycerol from biomass has been well developed and ethanol steam reforming (ESR) to produce hydrogen and glycerol conversion to other value added chemicals such as 1,2-propanediol, 1,3-propanediol and acrolein has attracted more and more research interest. The nature of supports has been found to play important roles in catalytic steam reforming of bio-ethanol and glycerol conversion to 1, 3-propanediol and acrolein. In this work the effects of ZnO (10-10) facet of Co/ZnO catalysts on ethanol steam reforming and the acidity of support on glycerol dehydration reaction were studied. For ethanol steam reforming, Co/ZnO catalysts were prepared using two kinds of ZnO supports with different fractions of ZnO (10-10) facet. The particle sizes of cobalt were analyzed using transmission electron microscopy (TEM) and X-ray diffraction (XRD). Catalytic reactions reveals that with higher fraction of ZnO (10-10) facet, yield to CO2 is much higher for ethanol steam reforming which is related to more stable metallic cobalt on ZnO (10-10) facet promoting C-C bond cleavage and water gas shift reaction. For glycerol dehydration reaction, the effects of WO3 loading of WO3/ZrO2 catalysts in dehydration of glycerol to acrolein were also studied using temperature-programmed desorption of NH3 (NH3 TPD) and pyridine FTIR. Samples with different WO3 loadings were prepared and studied in glycerol dehydration to acrolein reaction. ZrO2 sample without Brønsted acid sites has lowest acid density and showed very little yield to acrolein with acetol as the major product. With the increase of WO3 loading, yield to acetol decreases due to reduced Lewis acid sites and yield to acrolein is highest with 10WO3/ZrO2 catalyst which has high Brønsted acid density with moderate WOx domain size.
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Details
- Title
- Investigation of the properties of metal oxide catalysts for different catalytic reactions
- Creators
- Ning Yu
- Contributors
- Yong Wang (Chair)Su Ha (Committee Member) - Washington State University, Chemical Engineering and Bioengineering, School ofJean-Sabin McEwen (Committee Member) - Washington State University, Chemical Engineering and Bioengineering, School ofJUNMING SUN (Committee Member)
- 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] :
- Number of pages
- 52
- Identifiers
- 99900525024601842
- Language
- English
- Resource Type
- Thesis