Magnetic studies on dispersion effects in reduced nickel catalysts

dc.contributor.advisorRichardson, James T.
dc.contributor.committeeMemberHoneywell, Wallace I.
dc.contributor.committeeMemberNunes, Arthur C., Jr.
dc.creatorRosser, E. John
dc.date.accessioned2023-01-17T21:26:02Z
dc.date.available2023-01-17T21:26:02Z
dc.date.copyright1969
dc.date.issued1972
dc.description.abstractA Faraday system and a dynamic hydrogen specific chemisorption system were developed for use in the Catalysis Research Laboratory. Silica supported nickel catalysts were prepared and appropriate reduction conditions determined to give superparamagnetic behavior of these catalysts. From the theory of superparamagnetism, the average and mean equivalent spherical diameters were calculated from data taken on the Faraday system. Techniques were developed to calculate the equivalent spherical diameter from the dynamic hydrogen specific chemisorption system. For all the catalysts, the diameters agree favorably. From the thermomagnetic studies in the paramagnetic region, it was verified that the Curie temperature and effective paramagnetic moment are functions of crystallite size and dispersion. Comparison of Curie data and perfect coordination models showed that the Curie points are functions of the average coordination number of a crystallite. The effective paramagnetic moment was determined to be a function only of dispersion. No model has yet satisfactorily explained this phenomena.
dc.description.departmentChemical and Biomolecular Engineering, Department of
dc.format.digitalOriginreformatted digital
dc.format.mimetypeapplication/pdf
dc.identifier.other13637710
dc.identifier.urihttps://hdl.handle.net/10657/13577
dc.language.isoen
dc.rightsThis item is protected by copyright but is made available here under a claim of fair use (17 U.S.C. Section 107) for non-profit research and educational purposes. Users of this work assume the responsibility for determining copyright status prior to reusing, publishing, or reproducing this item for purposes other than what is allowed by fair use or other copyright exemptions. Any reuse of this item in excess of fair use or other copyright exemptions requires express permission of the copyright holder.
dc.titleMagnetic studies on dispersion effects in reduced nickel catalysts
dc.type.dcmiText
dc.type.genreThesis
dcterms.accessRightsThe full text of this item is not available at this time because it contains documents that are presumed to be under copyright and are accessible only to users who have an active CougarNet ID. This item will continue to be made available through interlibrary loan.
thesis.degree.collegeCollege of Engineering
thesis.degree.departmentChemical Engineering, Department of
thesis.degree.disciplineChemical Engineering
thesis.degree.grantorUniversity of Houston
thesis.degree.levelMasters
thesis.degree.nameMaster of Science
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