Charge distribution analysis of catalysts under simulated reaction conditions. Final report, October 1, 1993--June 30, 1995

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A new technique has been developed to measure mobile charge carriers in dielectric materials, insulators and catalysts. The technique, Charge Distribution Analysis, is based on the measurement of the dielectric polarization in an electric field gradient, contact-free, at 0 Hertz under minimum perturbation conditions. The measured parameter is the force F{sup +-} experienced by the sample in a gradient of reversible polarity. CDA allows to determine the sign of the majority charge carriers and the density of surface charges which may be correlated to the chemical or catalytic activity. Throughout this work a microbalance has been used as a force-sensing ... continued below

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45 p.

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Freund, F. February 1, 1996.

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Description

A new technique has been developed to measure mobile charge carriers in dielectric materials, insulators and catalysts. The technique, Charge Distribution Analysis, is based on the measurement of the dielectric polarization in an electric field gradient, contact-free, at 0 Hertz under minimum perturbation conditions. The measured parameter is the force F{sup +-} experienced by the sample in a gradient of reversible polarity. CDA allows to determine the sign of the majority charge carriers and the density of surface charges which may be correlated to the chemical or catalytic activity. Throughout this work a microbalance has been used as a force-sensing device. CDA can be applied to any dielectric material, compact or porous, in inert or reactive and corrosive gas environments. To conduct CDA experiments under simulated reaction conditions that are relevant to coal liquefaction research, e.g. in reactive and in part chemically corrosive atmospheres, several modifications were introduced to the current design. In particular, the stainless steel sample chamber and furnace/electrode assembly were built, and the gas flow system was redesigned. The CDA instrument was equipped with new data acquisition capabilities. Tests were performed in inert gases and in reactive and corrosive atmosphere between ambient temperature and 500{degrees}C on iron oxide and partially sulfidized iron oxide catalysts as well as on pyrite (FeS{sub 2}) single crystals.

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45 p.

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OSTI as DE96004995

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  • Other Information: PBD: [1996]

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  • Other: DE96004995
  • Report No.: DOE/PC/92106--T11
  • Grant Number: AC22-92PC92106
  • DOI: 10.2172/181522 | External Link
  • Office of Scientific & Technical Information Report Number: 181522
  • Archival Resource Key: ark:/67531/metadc664158

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  • February 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Nov. 19, 2015, 12:26 p.m.

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Freund, F. Charge distribution analysis of catalysts under simulated reaction conditions. Final report, October 1, 1993--June 30, 1995, report, February 1, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc664158/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.