Inhibition of catalytic oxidation of carbon/carbon composites by boron-doping

Xianxian Wu; Ljubisa R. Radovic

doi:10.1016/j.carbon.2005.02.029

Inhibition of catalytic oxidation of carbon/carbon composites by boron-doping

Xianxian Wu, Ljubisa R. Radovic

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63 Scopus citations

Abstract

The inhibition effect of high temperature boron-doping on the catalytic oxidation of carbon/carbon composites was investigated. Boron-doping at 2500 °C was found to improve the oxidation resistance of catalyst-loaded composites. Evident inhibition mechanisms include the reduction of active site number by increasing the crystallite size and the site blockage by formed boron oxide. Boron-doping at less than 1.0 wt.% was found to almost completely suppress the catalytic effect of calcium acetate after a slight carbon conversion. This inhibition effect was much less significant in the case of potassium-catalyzed oxidation where only a slight inhibition effect was observed. This is believed to be the essential result of the unique properties of potassium catalyst. Due to its wetting ability and mobility, potassium catalyst could form and maintain good interfacial contact with any exposed carbon surface regions.

Original language	English (US)
Pages (from-to)	1768-1777
Number of pages	10
Journal	Carbon
Volume	43
Issue number	8
DOIs	https://doi.org/10.1016/j.carbon.2005.02.029
State	Published - Jul 2005

All Science Journal Classification (ASJC) codes

General Chemistry
General Materials Science

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10.1016/j.carbon.2005.02.029

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title = "Inhibition of catalytic oxidation of carbon/carbon composites by boron-doping",

abstract = "The inhibition effect of high temperature boron-doping on the catalytic oxidation of carbon/carbon composites was investigated. Boron-doping at 2500 °C was found to improve the oxidation resistance of catalyst-loaded composites. Evident inhibition mechanisms include the reduction of active site number by increasing the crystallite size and the site blockage by formed boron oxide. Boron-doping at less than 1.0 wt.% was found to almost completely suppress the catalytic effect of calcium acetate after a slight carbon conversion. This inhibition effect was much less significant in the case of potassium-catalyzed oxidation where only a slight inhibition effect was observed. This is believed to be the essential result of the unique properties of potassium catalyst. Due to its wetting ability and mobility, potassium catalyst could form and maintain good interfacial contact with any exposed carbon surface regions.",

author = "Xianxian Wu and Radovic, {Ljubisa R.}",

note = "Funding Information: This work was supported by the Carbon Research Center at the Energy Institute of the Pennsylvania State University (F. Rusinko, Jr. director). Dr. T.B. Walker of Honeywell Inc. is acknowledged for providing C/C composites. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

year = "2005",

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doi = "10.1016/j.carbon.2005.02.029",

language = "English (US)",

volume = "43",

pages = "1768--1777",

journal = "Carbon",

issn = "0008-6223",

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T1 - Inhibition of catalytic oxidation of carbon/carbon composites by boron-doping

AU - Wu, Xianxian

AU - Radovic, Ljubisa R.

N1 - Funding Information: This work was supported by the Carbon Research Center at the Energy Institute of the Pennsylvania State University (F. Rusinko, Jr. director). Dr. T.B. Walker of Honeywell Inc. is acknowledged for providing C/C composites. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2005/7

Y1 - 2005/7

N2 - The inhibition effect of high temperature boron-doping on the catalytic oxidation of carbon/carbon composites was investigated. Boron-doping at 2500 °C was found to improve the oxidation resistance of catalyst-loaded composites. Evident inhibition mechanisms include the reduction of active site number by increasing the crystallite size and the site blockage by formed boron oxide. Boron-doping at less than 1.0 wt.% was found to almost completely suppress the catalytic effect of calcium acetate after a slight carbon conversion. This inhibition effect was much less significant in the case of potassium-catalyzed oxidation where only a slight inhibition effect was observed. This is believed to be the essential result of the unique properties of potassium catalyst. Due to its wetting ability and mobility, potassium catalyst could form and maintain good interfacial contact with any exposed carbon surface regions.

AB - The inhibition effect of high temperature boron-doping on the catalytic oxidation of carbon/carbon composites was investigated. Boron-doping at 2500 °C was found to improve the oxidation resistance of catalyst-loaded composites. Evident inhibition mechanisms include the reduction of active site number by increasing the crystallite size and the site blockage by formed boron oxide. Boron-doping at less than 1.0 wt.% was found to almost completely suppress the catalytic effect of calcium acetate after a slight carbon conversion. This inhibition effect was much less significant in the case of potassium-catalyzed oxidation where only a slight inhibition effect was observed. This is believed to be the essential result of the unique properties of potassium catalyst. Due to its wetting ability and mobility, potassium catalyst could form and maintain good interfacial contact with any exposed carbon surface regions.

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JO - Carbon

JF - Carbon

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ER -

Inhibition of catalytic oxidation of carbon/carbon composites by boron-doping

Abstract

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