Kinetics of the catalytic oxidation of phenol over manganese oxide in supercritical water

Oshima, Yoshito; Tomita, Kengo; Koda, Seiichiro

doi:10.1021/ie9902939

Title: Kinetics of the catalytic oxidation of phenol over manganese oxide in supercritical water

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Abstract

A kinetic analysis was made for the phenol disappearance rate in catalytic oxidation of phenol over MnO{sub 2} in supercritical water at a fixed temperature of 425 C and pressures between 22.7 and 27.2 MPa. The nonsupported MnO{sub 2} catalyst possessed a strong activity for promoting phenol oxidation, though the overall reaction rate was appreciably influenced by internal mass-transfer resistance. From the kinetic analysis on the reaction rate of the phenol disappearance, the global rate expression of the surface reaction was obtained, where the reaction orders with respect to phenol, oxygen, and water were almost unity, 0.7, and {minus}2.0, respectively. A Langmuir-type mechanism, in which phenol and oxygen adsorbed on the catalytic sites and water adsorbed on the same site to inhibit the phenol and oxygen adsorption, was proposed to explain the reaction orders for phenol, oxygen, and water.

Authors:: Oshima, Yoshito; Tomita, Kengo; Koda, Seiichiro

Publication Date:: Mon Nov 01 00:00:00 EST 1999

Research Org.:: Univ. of Tokyo (JP)

OSTI Identifier:: 20003875

Resource Type:: Journal Article

Journal Name:: Industrial and Engineering Chemistry Research

Additional Journal Information:: Journal Volume: 38; Journal Issue: 11; Other Information: PBD: Nov 1999; Journal ID: ISSN 0888-5885

Country of Publication:: United States

Language:: English

Subject:: 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 54 ENVIRONMENTAL SCIENCES; PHENOL; OXIDATION; MANGANESE OXIDES; CATALYTIC EFFECTS; CHEMICAL REACTION KINETICS; SUPERCRITICAL STATE; WASTE WATER; WATER TREATMENT

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                    Oshima, Yoshito, Tomita, Kengo, and Koda, Seiichiro. Kinetics of the catalytic oxidation of phenol over manganese oxide in supercritical water.  United States: N. p., 1999. 
        Web.  doi:10.1021/ie9902939.

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                    Oshima, Yoshito, Tomita, Kengo, & Koda, Seiichiro. Kinetics of the catalytic oxidation of phenol over manganese oxide in supercritical water.  United States.  https://doi.org/10.1021/ie9902939

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                    Oshima, Yoshito, Tomita, Kengo, and Koda, Seiichiro. 1999.  
        "Kinetics of the catalytic oxidation of phenol over manganese oxide in supercritical water".  United States.  https://doi.org/10.1021/ie9902939.

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@article{osti_20003875,

  title        = {Kinetics of the catalytic oxidation of phenol over manganese oxide in supercritical water},

  author       = {Oshima, Yoshito and Tomita, Kengo and Koda, Seiichiro},

  abstractNote = {A kinetic analysis was made for the phenol disappearance rate in catalytic oxidation of phenol over MnO{sub 2} in supercritical water at a fixed temperature of 425 C and pressures between 22.7 and 27.2 MPa. The nonsupported MnO{sub 2} catalyst possessed a strong activity for promoting phenol oxidation, though the overall reaction rate was appreciably influenced by internal mass-transfer resistance. From the kinetic analysis on the reaction rate of the phenol disappearance, the global rate expression of the surface reaction was obtained, where the reaction orders with respect to phenol, oxygen, and water were almost unity, 0.7, and {minus}2.0, respectively. A Langmuir-type mechanism, in which phenol and oxygen adsorbed on the catalytic sites and water adsorbed on the same site to inhibit the phenol and oxygen adsorption, was proposed to explain the reaction orders for phenol, oxygen, and water.},

  doi          = {10.1021/ie9902939},

  url          = {https://www.osti.gov/biblio/20003875},
  journal      = {Industrial and Engineering Chemistry Research},

  issn         = {0888-5885},

  number       = 11,

  volume       = 38,

  place        = {United States},

  year         = {Mon Nov 01 00:00:00 EST 1999},

  month        = {Mon Nov 01 00:00:00 EST 1999}

}

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