Magnetite surface area titration using nitric oxide, II. Pretreatment effects and silica-supported samples

J. E. Kubsh; C. R.F. Lund; Yi Chen; J. A. Dumesic

doi:10.1007/BF02069526

Magnetite surface area titration using nitric oxide, II. Pretreatment effects and silica-supported samples

J. E. Kubsh
, C. R.F. Lund
, Yi Chen
, J. A. Dumesic

Department of Chemical and Biological Engineering

University of Wisconsin-Madison

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

The use of NO adsorption for determination of Fe₃O₄ surface areas has been examined and extended, from earlier work on unsupported samples, to silica-supported Fe₃O₄. Gravimetric studies confirm earlier suggestions that the irreversible NO adsorption uptake on unsupported Fe₃O₄ is dependent upon sample pretreatment. Long (ca. 24 h) vacuum treatment at 650 K leads to increased apparent NO adsorption uptakes due to reduction of the surface. Magnetite particle size estimates were made using irreversible NO adsorption uptakes on silica-supported Fe₃O₄ samples that had received a "standard" 1 h vacuum pretreatment at 650 K. These estimates agreed well with average particle sizes calculated using x-ray line-broadening and magnetization measurements, indicating that NO adsorption can, in fact, be used to measure magnetite surface areas on silica-supported samples.

Original language	English
Pages (from-to)	115-119
Number of pages	5
Journal	Reaction Kinetics and Catalysis Letters
Volume	17
Issue number	1-2
DOIs	https://doi.org/10.1007/BF02069526
State	Published - Aug 1981

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abstract = "The use of NO adsorption for determination of Fe3O4 surface areas has been examined and extended, from earlier work on unsupported samples, to silica-supported Fe3O4. Gravimetric studies confirm earlier suggestions that the irreversible NO adsorption uptake on unsupported Fe3O4 is dependent upon sample pretreatment. Long (ca. 24 h) vacuum treatment at 650 K leads to increased apparent NO adsorption uptakes due to reduction of the surface. Magnetite particle size estimates were made using irreversible NO adsorption uptakes on silica-supported Fe3O4 samples that had received a {"}standard{"} 1 h vacuum pretreatment at 650 K. These estimates agreed well with average particle sizes calculated using x-ray line-broadening and magnetization measurements, indicating that NO adsorption can, in fact, be used to measure magnetite surface areas on silica-supported samples.",

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T1 - Magnetite surface area titration using nitric oxide, II. Pretreatment effects and silica-supported samples

AU - Kubsh, J. E.

AU - Lund, C. R.F.

AU - Chen, Yi

AU - Dumesic, J. A.

PY - 1981/8

Y1 - 1981/8

N2 - The use of NO adsorption for determination of Fe3O4 surface areas has been examined and extended, from earlier work on unsupported samples, to silica-supported Fe3O4. Gravimetric studies confirm earlier suggestions that the irreversible NO adsorption uptake on unsupported Fe3O4 is dependent upon sample pretreatment. Long (ca. 24 h) vacuum treatment at 650 K leads to increased apparent NO adsorption uptakes due to reduction of the surface. Magnetite particle size estimates were made using irreversible NO adsorption uptakes on silica-supported Fe3O4 samples that had received a "standard" 1 h vacuum pretreatment at 650 K. These estimates agreed well with average particle sizes calculated using x-ray line-broadening and magnetization measurements, indicating that NO adsorption can, in fact, be used to measure magnetite surface areas on silica-supported samples.

AB - The use of NO adsorption for determination of Fe3O4 surface areas has been examined and extended, from earlier work on unsupported samples, to silica-supported Fe3O4. Gravimetric studies confirm earlier suggestions that the irreversible NO adsorption uptake on unsupported Fe3O4 is dependent upon sample pretreatment. Long (ca. 24 h) vacuum treatment at 650 K leads to increased apparent NO adsorption uptakes due to reduction of the surface. Magnetite particle size estimates were made using irreversible NO adsorption uptakes on silica-supported Fe3O4 samples that had received a "standard" 1 h vacuum pretreatment at 650 K. These estimates agreed well with average particle sizes calculated using x-ray line-broadening and magnetization measurements, indicating that NO adsorption can, in fact, be used to measure magnetite surface areas on silica-supported samples.

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JO - Reaction Kinetics and Catalysis Letters

JF - Reaction Kinetics and Catalysis Letters

IS - 1-2

ER -

Magnetite surface area titration using nitric oxide, II. Pretreatment effects and silica-supported samples

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