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Title: Modified tin(IV) oxide (M/SnO{sub 2} M = Cr, La, Pr, Nd, Sm, Gd) catalysts for the oxidation of carbon monoxide and propane

Abstract

Materials formed by the incorporation of rare earth cations (M = La, Pr, Nd, Sm, Gd) into tin(IV) oxide using coprecipitation methods show no significant enhancement of catalytic activity toward the oxidation of carbon monoxide or propane over that of tin(IV) oxide itself. For chromium-promoted tin(IV) oxide catalysts, the temperature by which complete conversion of carbon monoxide and propane occurs is dependent on both the Cr:Sn atom ratio in the catalyst and the preparative route by which the chromium is incorporated into the catalyst. As prepared all the materials are hydrous gels comprising very small (<10 nm) particles of tin(IV) oxide over which the modifying metal component appears to be dispersed uniformly. Chromium(VI) oxyanions of the types CrO{sub 4}{sup 2{minus}}, Cr{sub 2}O{sub 7}{sup 2{minus}}, and Cr{sub 3}O{sub 10}{sup 2{minus}} are sorbed on to the surface of the tin(IV) oxide particles in the freshly prepared material derived from aqueous CrO{sub 3} and tin(IV) oxide gel. Prior to calcination the materials are microporous, but significant changes in specific surface area, pore volume, and pore size occur at temperature >673 K. Powder X-ray diffraction and electron microscopy confirm the formation of Cr{sub 2}O{sub 3} on calcination at K.

Authors:
; ;  [1]
  1. Univ. of Nottingham (United Kingdom). School of Chemistry
Publication Date:
OSTI Identifier:
687731
Resource Type:
Journal Article
Journal Name:
Journal of Catalysis
Additional Journal Information:
Journal Volume: 186; Journal Issue: 1; Other Information: PBD: 15 Aug 1999
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 33 ADVANCED PROPULSION SYSTEMS; CARBON MONOXIDE; PROPANE; OXIDATION; TIN OXIDES; CATALYTIC EFFECTS; CHROMIUM; LANTHANUM; PRASEODYMIUM; NEODYMIUM; SAMARIUM; GADOLINIUM; CALCINATION; MORPHOLOGICAL CHANGES

Citation Formats

Harrison, P.G., Bailey, C., and Azelee, W. Modified tin(IV) oxide (M/SnO{sub 2} M = Cr, La, Pr, Nd, Sm, Gd) catalysts for the oxidation of carbon monoxide and propane. United States: N. p., 1999. Web. doi:10.1006/jcat.1999.2528.
Harrison, P.G., Bailey, C., & Azelee, W. Modified tin(IV) oxide (M/SnO{sub 2} M = Cr, La, Pr, Nd, Sm, Gd) catalysts for the oxidation of carbon monoxide and propane. United States. doi:10.1006/jcat.1999.2528.
Harrison, P.G., Bailey, C., and Azelee, W. Sun . "Modified tin(IV) oxide (M/SnO{sub 2} M = Cr, La, Pr, Nd, Sm, Gd) catalysts for the oxidation of carbon monoxide and propane". United States. doi:10.1006/jcat.1999.2528.
@article{osti_687731,
title = {Modified tin(IV) oxide (M/SnO{sub 2} M = Cr, La, Pr, Nd, Sm, Gd) catalysts for the oxidation of carbon monoxide and propane},
author = {Harrison, P.G. and Bailey, C. and Azelee, W.},
abstractNote = {Materials formed by the incorporation of rare earth cations (M = La, Pr, Nd, Sm, Gd) into tin(IV) oxide using coprecipitation methods show no significant enhancement of catalytic activity toward the oxidation of carbon monoxide or propane over that of tin(IV) oxide itself. For chromium-promoted tin(IV) oxide catalysts, the temperature by which complete conversion of carbon monoxide and propane occurs is dependent on both the Cr:Sn atom ratio in the catalyst and the preparative route by which the chromium is incorporated into the catalyst. As prepared all the materials are hydrous gels comprising very small (<10 nm) particles of tin(IV) oxide over which the modifying metal component appears to be dispersed uniformly. Chromium(VI) oxyanions of the types CrO{sub 4}{sup 2{minus}}, Cr{sub 2}O{sub 7}{sup 2{minus}}, and Cr{sub 3}O{sub 10}{sup 2{minus}} are sorbed on to the surface of the tin(IV) oxide particles in the freshly prepared material derived from aqueous CrO{sub 3} and tin(IV) oxide gel. Prior to calcination the materials are microporous, but significant changes in specific surface area, pore volume, and pore size occur at temperature >673 K. Powder X-ray diffraction and electron microscopy confirm the formation of Cr{sub 2}O{sub 3} on calcination at K.},
doi = {10.1006/jcat.1999.2528},
journal = {Journal of Catalysis},
number = 1,
volume = 186,
place = {United States},
year = {1999},
month = {8}
}