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Title: Preparation, characterization and catalytic application of Barium molybdate (BaMoO4) and Barium tungstate (BaWO4) in the gas-phase oxidation of toluene.
Authors: Alencar, Lorena Dariane da Silva
Mesquita, Alexandre
Feitosa, Carlos Alberto Carneiro
Balzer, Rosana
Probst, Luiz Fernando Dias
Batalha, Daniel Carreira
Rosmaninho, Marcelo Gonçalves
Fajardo, Humberto Vieira
Bernardi, Maria Inês Basso
Keywords: Microwave-assisted hydrothermal
Polymeric precursor
Issue Date: 2017
Citation: ALENCAR, L.D. da S. et al. Preparation, characterization and catalytic application of Barium molybdate (BaMoO4) and Barium tungstate (BaWO4) in the gas-phase oxidation of toluene. Ceramics International, v. 43, n. 5, p. 4462-4469, abr. 2017. Disponível em: <>. Acesso em: 15 set. 2017.
Abstract: 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 H2 Temperature-Programmed Reduction (H2-TPR), O2-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.
ISSN:  0272-8842
metadata.dc.rights.license: O periódico Ceramics International concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 4210801039274.
Appears in Collections:DEQUI - Artigos publicados em periódicos

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