Abstract
A series of hydrotalcite (HT) and hydrotalcite modified by the transition metal ion Ni(II) was prepared with a modified coprecipitation method before being loaded with gold nanoparticles. The gold supported on Ni3Al hydrotalcite with a Ni2+/Al3+ molar ratio of 3:1 was investigated. Different techniques such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse reflection spectrum (UV-vis DRS) were applied to characterize the catalysts. A single-phase catalyst with high crystallinity, a layered structure and good composition was successfully fabricated. Good conversions and superior selectivities in the oxidation of benzyl alcohol and its derivatives were obtained with visible light due to the effect of localized surface plasmon resonance (LSPR) of gold nanoparticles and the synergy of the transition metal ion Ni(II). This reaction was proven to be photocatalytic by varying the intensity and wavelength of the visible light. The catalyst can be recycled three times. A corresponding photocatalytic mechanism of the oxidation reaction of benzyl alcohol was proposed.
Highlights
IntroductionSelective oxidations of alcohols to carbonyl compounds, such as aldehydes and ketones, have been very important organic synthesis processes in academic research and industrial production [1]
Selective oxidations of alcohols to carbonyl compounds, such as aldehydes and ketones, have been very important organic synthesis processes in academic research and industrial production [1].The carbonyl compounds, such as aldehydes and ketones, were key intermediates in perfumes, spices, flame retardants, pharmaceuticals and other fine chemicals [2]
The photocatalytic reaction can occur over Au supported on the hydrotalcite which can avoid the addition of alkaline substances
Summary
Selective oxidations of alcohols to carbonyl compounds, such as aldehydes and ketones, have been very important organic synthesis processes in academic research and industrial production [1]. AuAg [19] were commonly applied using oxygen as the oxidant in the oxidation of alcohols to aldehyde or ketone compounds Most of these were used in a homogeneous complex catalysis, in applications with high temperatures and high pressures requiring the addition of alkali, making the reaction conditions harsh. Initiated use of NiAl hydrotalcite as a catalyst by applying it in the selective oxidation of alcohols into ketones using oxygen. It can be used as a precursor for new intercalated materials [21]. The photocatalytic reaction can occur over Au supported on the hydrotalcite which can avoid the addition of alkaline substances It can happen under normal temperature and atmospheric pressure.
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