Electron Optical Studies of Fresh and Reduced Vanadium Pentoxide-Supported Rhodium Catalysts

One percent Rh/V 2O 5 catalysts prepared by wet impregnation with RhCl 3 · xH 2O and subsequent reduction in hydrogen were shown to be subject to the formation of lower oxides of vanadium via an Rh-catalysed reduction process. V 4O 9, VO 2, and V 2O 3 compounds were observed at reduction temperature...

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Bibliographic Details
Published inJournal of catalysis Vol. 140; no. 1; pp. 173 - 183
Main Authors Legrouri, A., Baird, T., Fryer, J.R.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier Inc 01.03.1993
Elsevier
Subjects
400201 - Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
Catalysis
CATALYST SUPPORTS
CATALYSTS
Catalysts: preparations and properties
CHALCOGENIDES
CHEMICAL REACTIONS
Chemistry
COHERENT SCATTERING
DIFFRACTION
ELECTRON MICROSCOPY
Exact sciences and technology
General and physical chemistry
IMPREGNATION
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
REDUCTION
REFRACTORY METAL COMPOUNDS
RHODIUM COMPOUNDS
SCATTERING
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY
VANADIUM COMPOUNDS
VANADIUM OXIDES
X-RAY DIFFRACTION
Scanning electron microscopy
Transition metal
Experimental study
X ray diffraction
Supported catalyst
Characterization
Chemical reduction
Infrared spectrometry
Programmed temperature
Heterogeneous catalysis
Impregnation
Transmission electron microscopy
Vanadium V Oxides
Rhodium
Preparation
Platinoid
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Summary:One percent Rh/V 2O 5 catalysts prepared by wet impregnation with RhCl 3 · xH 2O and subsequent reduction in hydrogen were shown to be subject to the formation of lower oxides of vanadium via an Rh-catalysed reduction process. V 4O 9, VO 2, and V 2O 3 compounds were observed at reduction temperatures of 250, 450, and 600°C, respectively, as characterised by IR, XRD, and electron optical methods. Maximum hydrogen uptake by the Rh-loaded V 2O 5 occurred at 155°C according to TPR data, and this contrasts with the onset of reduction of V 2O 5 alone at ∼450°C. Mechanistic and structural aspects of the Rh-catalysed reduction process are discussed.
ISSN:0021-9517
1090-2694
DOI:10.1006/jcat.1993.1076