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Oxidation of Styrene to Benzaldehyde by Anhydrous Hydrogen Peroxide on γ‐Alumina‐Supported V 2 O 5 Nanoparticle Catalysts: Optimization Studies Using Response Surface Methodology
Author(s) -
Ahmad, Abdul L.,
Koohestani Behnam,
Bhatia Subhash,
Ooi Seng B.
Publication year - 2012
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2011.02680.x
Subject(s) - benzaldehyde , styrene , anhydrous , styrene oxide , selectivity , catalysis , hydrogen peroxide , materials science , response surface methodology , nuclear chemistry , particle size , inorganic chemistry , nanoparticle , chemical engineering , chemistry , organic chemistry , nanotechnology , copolymer , chromatography , polymer , composite material , engineering
Particles of γ‐alumina‐supported V 2 O 5 with an average particle size of 5‐10 nm and a surface area of 174.8 m 2 /g were prepared through a wet impregnation method. These materials were found to be effective in the selective oxidation of styrene to benzaldehyde using anhydrous H 2 O 2 . Response surface methodology was used to investigate the effect of the oxidant ( H 2 O 2 ) concentration (from 20 to 60 mmol), temperature (from 45 to 75°C), time (from 2.5 to 6 h) and catalyst concentration (from 0.014 to 0.036 g/L) on the styrene conversion and the selectivity of benzaldehyde and styrene oxide. Based on the response surface methodology analysis, the optimal oxidation conditions occur with a reaction temperature of 62.7°C, a reaction time of 5.15 h, a molar ratio of H 2 O 2 /styrene of 2.7:1 and a catalyst concentration of 0.024 g/L. These conditions result in maximal styrene conversion (68.23%) and benzaldehyde selectivity (57.32%).