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mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Oxidative dehydrogenation of ethane to ethylene and acetic acid by multicomponent mixed oxide catalysts
  name:
    name part: Jitkarnka, Sirirat
    name part: 1972-
    role:
      role term: creator
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: xx
    date issued: 2001
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xxi, 245 leaves : illustrations ; 28 cm.
  abstract: Multi-element catalysts are gaining more attention than single or double component materials in catalyst preparations. Due to the synergistic effect of co-components, the activity of a multi-component catalyst is significantly improved. Mo-V-Nb-Sb-based mixed oxide catalysts are proven to be active for oxidative dehydrogenation of ethane to ethylene and acetic acid. One of the advantages of the ability to produce ethylene and acetic acid in one process is that the products can subsequently be supplied directly to an integrated process for manufacture of vinyl acetate monomer (VAM). Conventionally, the catalysts can be prepared by aqueous mixing of inorganic forms of starting materials. However, the disadvantage of this method is the difficulty in reproducibility of the catalysts. The alternative way to produce the catalysts proposed here is preferably called "Sol-Gel Method." Alkoxide forms, instead of other inorganic forms, of some components such as vanadium, niobium and antimony are used as starting materials. This alternative method of preparation can improve the reproducibility of the catalysts in terms of the phases of the catalysts and the activity. In the development, Mo-V-Nb-Sb-based mixed oxide catalysts are prepared by Sol-Gel method and loaded with calcium in four different methods, and are tested on the oxidative dehydrogenation of ethane at 282°C and 304°C, and 200 psig. The activity of the catalysts prepared by different routes was compared. One method was discovered to be the only preparation method yielding the catalyst whose performance was superior to the one containing only four main elements. Furthermore, additional elements were also added to the based mixed oxide catalysts using two selected methods to examine the improvement on the catalyst activity. Roles of calcium contents in the catalysts were also investigated. Catalyst characterization such as XRD, TPD and BET were also performed. Finally, based on the functional forms of rate equations…
  note: by Sirirat Jitkarnka.
  note: Vita.
  note: "Major Subject: Chemical Engineering".
  note: Issued also on microfiche from University Microfilm Inc.
  note: Ph. D. Texas A&M University 2001.
  note: Includes bibliographical references (leaves 209-212).
  subject:
    topic: Major chemical engineering
  identifier: 30-11733 UMI
  identifier: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  record info:
    record content source: TXA
    record creation date: 020206
    record change date: 20190325102936.0
    record identifier: in00001648025