NDLI: Effect of alkali and alkaline earth metal ions on benzyl alcohol oxidation activity of titanate nanotube-supported Au catalysts

Content Provider	Royal Society of Chemistry (RSC)
Author	Nepak, Devadutta Srinivas, Darbha
Copyright Year	2015
Abstract	Sodium titanate nanotubes (NaTNTs) were prepared by alkali treatment of anatase titania. They were then ion-exchanged with alkali and alkaline earth metal ions to get ATNTs (A = Li+, K+, Cs+, Mg2+, Ca2+, Sr2+and Ba2+). Gold (1–5 wt%) was supported on these nanotubes by a deposition–precipitation method and investigated as a catalyst for the selective oxidation of benzyl alcohol with air/molecular oxygen (1 atm) under solvent- and alkali-free conditions. Detailed characterization by X-ray powder diffraction, high resolution transmission electron microscopy, N2-physisorption, diffuse reflectance UV-visible spectroscopy, X-ray photoelectron spectroscopy and CO2-temperature-programmed desorption techniques revealed that the basicity of the catalyst influences the uptake, mean particle size, electronic properties and oxidation activity of the supported gold. Benzaldehyde formed with a selectivity of about 99%. The catalytic activity (turnover frequency) was found to have a direct relationship with the basicity and an inverse relationship with the Au particle size. Among the catalysts investigated, Au/BaTNTs, having higher basicity, smaller Au particles and higher metal dispersion, showed enhanced catalytic activity than the other Au/ATNT catalysts. Pd addition to Au leading to Au–Pd/BaTNTs increased the activity (TOF) but lowered the selectivity for benzaldehyde (80 wt%). Titanate nanotubes donate electron density to Au particles, yielding electron rich Au ions, which are responsible for activating molecular oxygen and oxidizing benzyl alcohol. Au/BaTNTs, having higher basicity and lower size Au nanoparticles than the other Au/ATNT, activates molecular oxygen more easily and thereby enhances the catalytic activity.
Starting Page	47740
Ending Page	47748
Page Count	9
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	5
Issue Number	59
Journal	RSC Advances
DOI	10.1039/c5ra06496a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Oxygen Anatase Dispersion relation Benzaldehyde Powder diffraction Alkaline earth metal Benzyl alcohol Photoemission spectroscopy Physisorption Transmission electron microscopy Ultraviolet\u2013visible spectroscopy Solvent X-ray photoelectron spectroscopy
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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