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Title: Structure and Oxidation State of Silica-Supported Manganese Oxide Catalysts and Reactivity for Acetone Oxidation with Ozone

Abstract

Silica-supported manganese oxide catalysts with loadings of 3, 10, 15, and 20 wt % (as MnO{sub 2}) were characterized with use of X-ray absorption spectroscopy and X-ray diffraction (XRD). The edge positions in the X-ray absorption spectra indicated that the oxidation state for the manganese decreased with increasing metal oxide loading from a value close to that of Mn{sub 2}O{sub 3} (+3) to a value close to that of Mn{sub 3}O{sub 4} (+2 2/3). The XRD was consistent with these results as the diffractograms for the supported catalysts of higher manganese oxide loading matched those of a Mn{sub 3}O{sub 4} reference. The reactivity of the silica-supported manganese oxide catalysts in acetone oxidation with ozone as an oxidant was studied over the temperature range of 300 to 600 K. Both oxygen and ozone produced mainly CO{sub 2} as the product of oxidation, but in the case of ozone the reaction temperature and activation energy were significantly reduced. The effect of metal oxide loading was investigated, and the activity for acetone oxidation was greater for a 10 wt % MnO{sub x}/SiO{sub 2} catalyst sample compared to a 3 wt % MnO{sub x}/SiO{sub 2} sample.

Authors:
; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
914202
Report Number(s):
BNL-78770-2007-JA
Journal ID: ISSN 1089-5647; JPCBFK; TRN: US200804%%333
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
J. Phys. Chem. B
Additional Journal Information:
Journal Volume: 110; Journal ID: ISSN 1089-5647
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; MANGANESE OXIDES; CATALYTIC EFFECTS; CATALYST SUPPORTS; SILICON OXIDES; VALENCE; ACETONE; OXIDATION; OZONE; ACTIVATION ENERGY; national synchrotron light source

Citation Formats

Reed, C, Lee, Y, and Oyama, S. Structure and Oxidation State of Silica-Supported Manganese Oxide Catalysts and Reactivity for Acetone Oxidation with Ozone. United States: N. p., 2006. Web. doi:10.1021/jp054288w.
Reed, C, Lee, Y, & Oyama, S. Structure and Oxidation State of Silica-Supported Manganese Oxide Catalysts and Reactivity for Acetone Oxidation with Ozone. United States. https://doi.org/10.1021/jp054288w
Reed, C, Lee, Y, and Oyama, S. 2006. "Structure and Oxidation State of Silica-Supported Manganese Oxide Catalysts and Reactivity for Acetone Oxidation with Ozone". United States. https://doi.org/10.1021/jp054288w.
@article{osti_914202,
title = {Structure and Oxidation State of Silica-Supported Manganese Oxide Catalysts and Reactivity for Acetone Oxidation with Ozone},
author = {Reed, C and Lee, Y and Oyama, S},
abstractNote = {Silica-supported manganese oxide catalysts with loadings of 3, 10, 15, and 20 wt % (as MnO{sub 2}) were characterized with use of X-ray absorption spectroscopy and X-ray diffraction (XRD). The edge positions in the X-ray absorption spectra indicated that the oxidation state for the manganese decreased with increasing metal oxide loading from a value close to that of Mn{sub 2}O{sub 3} (+3) to a value close to that of Mn{sub 3}O{sub 4} (+2 2/3). The XRD was consistent with these results as the diffractograms for the supported catalysts of higher manganese oxide loading matched those of a Mn{sub 3}O{sub 4} reference. The reactivity of the silica-supported manganese oxide catalysts in acetone oxidation with ozone as an oxidant was studied over the temperature range of 300 to 600 K. Both oxygen and ozone produced mainly CO{sub 2} as the product of oxidation, but in the case of ozone the reaction temperature and activation energy were significantly reduced. The effect of metal oxide loading was investigated, and the activity for acetone oxidation was greater for a 10 wt % MnO{sub x}/SiO{sub 2} catalyst sample compared to a 3 wt % MnO{sub x}/SiO{sub 2} sample.},
doi = {10.1021/jp054288w},
url = {https://www.osti.gov/biblio/914202}, journal = {J. Phys. Chem. B},
issn = {1089-5647},
number = ,
volume = 110,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}