Mechanochemical synthesis, characterization and catalytic activity of Bi2WO6 nanoparticles in CO, n-hexane and methane oxidation reactions

作者：Gancheva Maria^*; Iordanova Reni; Dimitriev Yanko; Nihtianova Diana; Stefanov Plamen; Naydenov Anton

来源：Journal of Alloys and Compounds, 2013, 570: 34-40.

DOI：10.1016/j.jallcom.2013.03.157

• Mechanochemical synthesis
• Nanoparticles
• Catalytic activity of CO
• n-Hexane and methane oxidation

This article represents data on the mechanochemical synthesis, characterization and catalytic properties of Bi2WO6 nanoparticles. The synthesis of Bi2WO6 nanopowder (10 nm) started after 90 min of milling time interval and it was completely finished after 4 h when using 2.5 g batch of the initial oxides. Longer milling time intervals (8 h) were needed to synthesize the target nanophase (4 nm), when using a 4.0 g batch of precursor oxides. The Bi2WO6 powders manifest low absorbance ability in the visible range with a band gap ranging from 2.85 to 2.88 eV. The catalytic activity was investigated in the reactions of CO, n-hexane and methane oxidation, respectively. The oxidation of CO on Bi2WO6 proceeds at temperatures higher than 200 degrees C, while the complete oxidation of n-hexane was found to occur at temperatures higher than 250 degrees C. A remarkable increase in the catalytic activity was achieved in the case of Bi2WO6 supported with 0.14 wt.% Pd. The promotional effect of Bi on the catalytic activity of the Pd loaded sample could be explained by the formation of alloy or inter-metallic phases (alpha-Bi2Pd and beta-BiPd), which is considered as perspective for the development of a catalyst for treatment of methane emissions.

• 出版日期2013-9-5
• 单位北京化工大学