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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Preparation, characterization and catalytic application of Barium molybdate (BaMoO4) and Barium tungstate (BaWO4) in the gas-phase oxidation of toluene

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Alencar, Lorena. D. S. ; Mesquita, Alexandre ; Feitosa, Carlos A. C. ; Balzer, Rosana ; Probst, Luiz F. D. ; Batalha, Daniel C. ; Rosmaninho, Marcelo G. ; Fajardo, Humberto V. ; Bernardi, Maria I. B.
Total Authors: 9
Document type: Journal article
Source: CERAMICS INTERNATIONAL; v. 43, n. 5, p. 4462-4469, APR 1 2017.
Web of Science Citations: 12

Barium molybdate and Barium tungstate are important materials due their photoluminescent properties and they also have catalysis and photocatalysis applications. In this work, powders of these compounds were prepared by microwave-assisted hydrothermal (MAH) method and polymeric precursor method (PPM) and their structural and optical properties were studied. Furthermore, these materials were employed as solid catalysts towards gas phase toluene oxidation reactions. X-ray diffraction confirms the purity of materials at both preparation methods and reveals a preferential growth when the powders are prepared by MAH due polymeric agents and processing using microwave, which was confirmed by Field emission scanning electron microscopy. Photoluminesce emission was attributed to the charge-transfer transitions within the {[}WO4](2-) and {[}MoO4](2-) complexes. The H-2 Temperature-Programmed Reduction (H-2-TPR), Oz-chemisorption and extended X-ray absorption fine structure (EXAFS) results indicated that BaWO4 samples, compared with BaMoO4 samples, have higher oxygen mobility and oxygen vacancies that appear as key factors for the achievement of better catalytic performances. (AU)

FAPESP's process: 13/07909-4 - Preparation and characterization of magnetic oxides films nanostructured
Grantee:Maria Inês Basso Bernardi
Support type: Regular Research Grants
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC