The Adsorption and Reactions of Halogenated Volatile Organic Compounds (VOCs) on Metal Oxides - Final Report

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The purpose of this research was to provide a fundamental understanding of the adsorption and catalytic reactions of CCl{sub 4} on metal oxide surfaces with a view to developing strategies for its remediation. The scientific knowledge generated by this project should enable environmental engineers to evaluate the potential of destructive adsorption of CCl{sub 4} and the catalytic reaction of CCl{sub 4} with H{sub 2}O as an alternative for the remediation of carbon tetrachloride. Emphasis was placed on the alkaline earth metal oxides, i.e., MgO, CaO, SrO and BaO because it had previously been demonstrated that MgO and CaO reacted with ... continued below

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Lunsford, J. H. November 1, 2000.

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Description

The purpose of this research was to provide a fundamental understanding of the adsorption and catalytic reactions of CCl{sub 4} on metal oxide surfaces with a view to developing strategies for its remediation. The scientific knowledge generated by this project should enable environmental engineers to evaluate the potential of destructive adsorption of CCl{sub 4} and the catalytic reaction of CCl{sub 4} with H{sub 2}O as an alternative for the remediation of carbon tetrachloride. Emphasis was placed on the alkaline earth metal oxides, i.e., MgO, CaO, SrO and BaO because it had previously been demonstrated that MgO and CaO reacted with CCl{sub 4} to form the corresponding metal chloride and carbon dioxide. This process was named destructive adsorption. It was found that the activity toward CCl{sub 4} parallels the basicity of the alkaline earth metal oxide, i.e., the activity decreased in the order BaO>SrO>CaO>MgO. It was found that MgO is active as a catalyst for the reaction of CCl{sub 4} with H{sub 2}O to form CO{sub 2} and HCl. The HCl could be neutralized in aqueous NaOH, and the resulting dilute salt solution could be easily disposed of. Among the alkaline earth oxides, MgO is the only active catalyst at moderate temperatures. Thus, nearly complete removal of CCl{sub 4} can be achieved over a long period. The favorable catalytic activity of MgO relative to the other alkaline earth oxides is attributed to two factors; first, MgO is not as readily converted to MgCl{sub 2}, and, second, the decomposition temperature of MgCO{sub 3} ({approximately}430 C) is substantially less than that of the other carbonates. As a consequence, chloride and carbonate phases do not substantially inhibit the catalytic activity.

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OSTI as DE00775042

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  • Other Information: PBD: 1 Nov 2000

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  • Report No.: DOE/ER/14724
  • Report No.: Project Number 55115
  • Grant Number: FG07-96ER14724
  • DOI: 10.2172/775042 | External Link
  • Office of Scientific & Technical Information Report Number: 775042
  • Archival Resource Key: ark:/67531/metadc719034

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  • November 1, 2000

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  • Sept. 29, 2015, 5:31 a.m.

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  • July 25, 2016, 6:37 p.m.

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Lunsford, J. H. The Adsorption and Reactions of Halogenated Volatile Organic Compounds (VOCs) on Metal Oxides - Final Report, report, November 1, 2000; United States. (digital.library.unt.edu/ark:/67531/metadc719034/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.