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The Resource The kinetics of non-catalyzed supercritical water reforming of ethanol, by Jonathan E. Wenzel, (electronic resource)

The kinetics of non-catalyzed supercritical water reforming of ethanol, by Jonathan E. Wenzel, (electronic resource)

Creator
Contributor
Summary
Agriculturally produced ethanol, a renewable resource, may be reformed noncatalytically into hydrogen by a novel process utilizing supercritical water, which acts synergistically both as a solvent and as a reactant. By utilizing supercritical water as a reaction medium, many pitfalls of catalytic reformation may be avoided, including catalyst poisoning due to feedstock impurities, catalyst fouling by carbon deposition, and catalyst deactivation. Supercritical water is water above its critical point, 3740C and 22.1 MPa, and exhibits both liquid and gas-like properties and acts a non-polar solvent. Since supercritical water is denser than steam, supercritical water reactors have the potential of being smaller than their catalytic counterparts. The kinetics of supercritical water reformation of ethanol were experimentally studied using a 1 liter Inconel® 625 Grade 1 alloy tubular reactor. For the experimental study, the temperature was varied between 901 K and 983 K, the water feed rate was varied between 6.4 g/min and 19.7 g/min, the ethanol feed rate was varied between 0.17 g/min and 2.2 g/min, and the pressure was fixed at 24.2 MPa. All ethanol fed was converted into gaseous products: hydrogen, carbon dioxide, methane, ethane, and carbon monoxide, in order of mole fraction from highest to lowest. Hydrogen was produced by two competing reactions: the direct reformation of ethanol into hydrogen and carbon oxides and the pyrolytic decomposition of ethanol into hydrogen, methane, and carbon oxides. In addition, there is a third, undesirable, reaction x that remarkably occurs in a water-rich environment: the dehydration of ethanol to form ethene and the subsequent hydrogenation of ethene to form ethane. In addition, a low abundance of carbon monoxide in relation to carbon dioxide is indicative that the forward water-gas shift reaction is taking place. Arrhenius activation energies for the direct reformation reaction and the pyrolytic decomposition reaction were also regressed
Language
eng
Work
Publication
Extent
1 online resource (x, 85 pages)
Note
  • Title from PDF of title page (University of Missouri--Columbia, viewed on March 2, 2010)
  • The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file
  • Dr. Sunggyu Lee, Dissertation Advisor
  • Vita
Instance
Label
The kinetics of non-catalyzed supercritical water reforming of ethanol
Title
The kinetics of non-catalyzed supercritical water reforming of ethanol
Statement of responsibility
by Jonathan E. Wenzel
Creator
Contributor
Thesis advisor
Subject
Genre
Language
eng
Summary
Agriculturally produced ethanol, a renewable resource, may be reformed noncatalytically into hydrogen by a novel process utilizing supercritical water, which acts synergistically both as a solvent and as a reactant. By utilizing supercritical water as a reaction medium, many pitfalls of catalytic reformation may be avoided, including catalyst poisoning due to feedstock impurities, catalyst fouling by carbon deposition, and catalyst deactivation. Supercritical water is water above its critical point, 3740C and 22.1 MPa, and exhibits both liquid and gas-like properties and acts a non-polar solvent. Since supercritical water is denser than steam, supercritical water reactors have the potential of being smaller than their catalytic counterparts. The kinetics of supercritical water reformation of ethanol were experimentally studied using a 1 liter Inconel® 625 Grade 1 alloy tubular reactor. For the experimental study, the temperature was varied between 901 K and 983 K, the water feed rate was varied between 6.4 g/min and 19.7 g/min, the ethanol feed rate was varied between 0.17 g/min and 2.2 g/min, and the pressure was fixed at 24.2 MPa. All ethanol fed was converted into gaseous products: hydrogen, carbon dioxide, methane, ethane, and carbon monoxide, in order of mole fraction from highest to lowest. Hydrogen was produced by two competing reactions: the direct reformation of ethanol into hydrogen and carbon oxides and the pyrolytic decomposition of ethanol into hydrogen, methane, and carbon oxides. In addition, there is a third, undesirable, reaction x that remarkably occurs in a water-rich environment: the dehydration of ethanol to form ethene and the subsequent hydrogenation of ethene to form ethane. In addition, a low abundance of carbon monoxide in relation to carbon dioxide is indicative that the forward water-gas shift reaction is taking place. Arrhenius activation energies for the direct reformation reaction and the pyrolytic decomposition reaction were also regressed
Cataloging source
MUU
http://library.link/vocab/creatorName
Wenzel, Jonathan E
Degree
Ph. D.
Dissertation year
2008.
Granting institution
University of Missouri--Columbia
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
  • dictionaries
  • bibliography
  • theses
http://library.link/vocab/relatedWorkOrContributorName
Lee, Sunggyu
http://library.link/vocab/subjectName
  • Agricultural wastes as fuel
  • Ethanol as fuel
  • Supercritical fluids
  • Catalytic reforming
Target audience
specialized
Label
The kinetics of non-catalyzed supercritical water reforming of ethanol, by Jonathan E. Wenzel, (electronic resource)
Instantiates
Publication
Note
  • Title from PDF of title page (University of Missouri--Columbia, viewed on March 2, 2010)
  • The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file
  • Dr. Sunggyu Lee, Dissertation Advisor
  • Vita
Bibliography note
Includes bibliographical references
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
609650626
Extent
1 online resource (x, 85 pages)
Form of item
electronic
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations (some color).
Specific material designation
remote
System control number
(OCoLC)609650626
Label
The kinetics of non-catalyzed supercritical water reforming of ethanol, by Jonathan E. Wenzel, (electronic resource)
Publication
Note
  • Title from PDF of title page (University of Missouri--Columbia, viewed on March 2, 2010)
  • The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file
  • Dr. Sunggyu Lee, Dissertation Advisor
  • Vita
Bibliography note
Includes bibliographical references
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
609650626
Extent
1 online resource (x, 85 pages)
Form of item
electronic
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations (some color).
Specific material designation
remote
System control number
(OCoLC)609650626

Subject

Genre

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