Influence of Adding Molybdenum on Structure and Performance of Fe x O y /SBA-15 Catalysts in Selective Oxidation of Propene

Mixed iron and molybdenum oxide catalysts supported on nanostructured silica, SBA-15, were synthesized with various Mo/Fe atomic ratios ranging from 0.07/1.0 to 0.57/1.0. Structural characterization of as-prepared Mo O _Fe O /SBA-15 samples was performed by nitrogen physisorption, X-ray diffraction,...

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Bibliographic Details
Published in:ChemistryOpen (Weinheim) 2019-08, Vol.8 (8), p.1133-1142
Main Authors: Genz, Nina Sharmen, Ressler, Thorsten
Format: Article
Language:English
Subjects:
Adsorption
Catalysis
Catalysts
Dispersion
Gas flow
Gases
Glycerol
Green chemistry
Heat conductivity
Iron
Metal oxides
Molybdenum
Molybdenum oxides
Nitrogen
Oxidation
Particle size
Raw materials
Reducing agents
Selectivity
Sensors
Silicon dioxide
Structural analysis
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Summary:Mixed iron and molybdenum oxide catalysts supported on nanostructured silica, SBA-15, were synthesized with various Mo/Fe atomic ratios ranging from 0.07/1.0 to 0.57/1.0. Structural characterization of as-prepared Mo O _Fe O /SBA-15 samples was performed by nitrogen physisorption, X-ray diffraction, and DR-UV-Vis spectroscopy. Adding molybdenum resulted in a pronounced dispersion effect on supported iron oxidic species. Increasing atomic ratio up to 0.21Mo/1.0Fe was accompanied by decreasing species sizes. Strong interactions between iron and molybdenum during the synthesis resulted in the formation of Fe-O-Mo structure units, possibly Fe (MoO ) -like species. Reducibility of Mo O _Fe O /SBA-15 catalysts was investigated by temperature-programmed reduction experiments with hydrogen as reducing agent. The lower reducibility obtained when adding molybdenum was ascribed to both dispersion and electronic effect of molybdenum. Catalytic performance of Mo O _Fe O /SBA-15 samples was studied in selective gas-phase oxidation of propene with O as oxidant. Adding molybdenum resulted in an increased acrolein selectivity and a decreased selectivity towards total oxidation products.
ISSN:2191-1363
2191-1363
DOI:10.1002/open.201900219