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Title: Effect of molybdenum addition to Rh/SiO/sub 2/ catalysts: appearance of a second rhodium dicarbonyl species

Abstract

The effects of molybdenum addition to silica-supported rhodium have been studied by using infrared spectroscopy. A new rhodium dicarbonyl species with characteristic bands at 2110 and 2052 cm/sup -1/ was observed during treatment of Rh-Mo/SiO/sub 2/ catalysts with CO at room temperature following reaction of nitric oxide with CO over the catalysts at 200/sup 0/C. These bands are approximately 15 cm/sup -1/ higher than the bands usually reported for the rhodium dicarbonyl species. Infrared spectra show the presence of both rhodium dicarbonyl species simultaneously which suggests that the new species is not a shifted form of the lower frequency species, but rather a new entity. It is also observed that the new species is much less stable in a reducing atmosphere than the lower frequency species. It is therefore proposed that the new dicarbonyl species contains a more oxidized form of rhodium than the traditional Rh/sup +/ dicarbonyl species and that the addition of molybdenum promotes this increased oxidation of the Rh surface sites.

Authors:
;
Publication Date:
Research Org.:
Brigham Young Univ., Provo, UT (USA)
OSTI Identifier:
6862055
Resource Type:
Journal Article
Journal Name:
J. Phys. Chem.; (United States)
Additional Journal Information:
Journal Volume: 92:9
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 33 ADVANCED PROPULSION SYSTEMS; MOLYBDENUM OXIDES; CATALYTIC EFFECTS; RHODIUM OXIDES; SILICA; ABSORPTION SPECTROSCOPY; CARBON MONOXIDE; CARBONYLS; CATALYSIS; CATALYSTS; EXPERIMENTAL DATA; INFRARED SPECTRA; NITRIC OXIDE; RHODIUM COMPOUNDS; VALENCE; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; DATA; INFORMATION; MINERALS; MOLYBDENUM COMPOUNDS; NITROGEN COMPOUNDS; NITROGEN OXIDES; NUMERICAL DATA; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; REFRACTORY METAL COMPOUNDS; SILICON COMPOUNDS; SILICON OXIDES; SPECTRA; SPECTROSCOPY; TRANSITION ELEMENT COMPOUNDS; 400201* - Chemical & Physicochemical Properties; 330701 - Emission Control- Nitrogen Oxides

Citation Formats

Wardinsky, M D, and Hecker, W C. Effect of molybdenum addition to Rh/SiO/sub 2/ catalysts: appearance of a second rhodium dicarbonyl species. United States: N. p., 1988. Web. doi:10.1021/j100320a041.
Wardinsky, M D, & Hecker, W C. Effect of molybdenum addition to Rh/SiO/sub 2/ catalysts: appearance of a second rhodium dicarbonyl species. United States. https://doi.org/10.1021/j100320a041
Wardinsky, M D, and Hecker, W C. Thu . "Effect of molybdenum addition to Rh/SiO/sub 2/ catalysts: appearance of a second rhodium dicarbonyl species". United States. https://doi.org/10.1021/j100320a041.
@article{osti_6862055,
title = {Effect of molybdenum addition to Rh/SiO/sub 2/ catalysts: appearance of a second rhodium dicarbonyl species},
author = {Wardinsky, M D and Hecker, W C},
abstractNote = {The effects of molybdenum addition to silica-supported rhodium have been studied by using infrared spectroscopy. A new rhodium dicarbonyl species with characteristic bands at 2110 and 2052 cm/sup -1/ was observed during treatment of Rh-Mo/SiO/sub 2/ catalysts with CO at room temperature following reaction of nitric oxide with CO over the catalysts at 200/sup 0/C. These bands are approximately 15 cm/sup -1/ higher than the bands usually reported for the rhodium dicarbonyl species. Infrared spectra show the presence of both rhodium dicarbonyl species simultaneously which suggests that the new species is not a shifted form of the lower frequency species, but rather a new entity. It is also observed that the new species is much less stable in a reducing atmosphere than the lower frequency species. It is therefore proposed that the new dicarbonyl species contains a more oxidized form of rhodium than the traditional Rh/sup +/ dicarbonyl species and that the addition of molybdenum promotes this increased oxidation of the Rh surface sites.},
doi = {10.1021/j100320a041},
url = {https://www.osti.gov/biblio/6862055}, journal = {J. Phys. Chem.; (United States)},
number = ,
volume = 92:9,
place = {United States},
year = {1988},
month = {5}
}