Abstract
A simple and practical Rh-catalyzed hydroformylation of vinyl acetate has been synthesized via impregnation-calcination method using silicate nanotubes (MgSNTs) as the supporter. The Rh0 (zero valent state of rhodium) was obtained by calcination. The influence of calcination temperature on catalytic performance of the catalysts was investigated in detail. The catalysts were characterized in detail by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectrometer (XPS), atomic emission spectrometer (ICP), and Brunauer–Emmett–Teller (BET) surface-area analyzers. The Rh/MgSNTs(a2) catalyst shows excellent catalytic activity, selectivity and superior cyclicity. The catalyst could be easily recovered by phase separation and was used up to four times.
Highlights
Hydroformylation allows atom-efficient and direct formation of aldehydes from olefins and synthesis gas, and has become a powerful synthetic route for the preparation of some key organic intermediates [1]
Owing to lower reaction temperature and pressure, nano-Rh-based catalysts have been widely used in hydroformylation reactions [13,14]
Supported Rh catalysts have emerged as very active catalysts for hydroformylation of olefins [15,16]
Summary
Hydroformylation allows atom-efficient and direct formation of aldehydes from olefins and synthesis gas, and has become a powerful synthetic route for the preparation of some key organic intermediates [1]. Catalysts 2019, 9, 215 organic polymers [24], Rh nanoparticles are prone to sintering caused by Ostwald ripening, coalescence, or particle migration due to the weak metal-support interactions It is welcome improve the thermal stability. MgSNTs are suitable have as carriers catalysts They area can effectively high of specific surface (SSA) and disperse and immobilize activestrong components, improve catalytic and stability, and one-dimensional tubularmetal structure, adsorption capacity, largeractivity pore size and outstanding overcome the disadvantages of hard separation and in homogeneous thermal stability. Exhibited regioselectivity (9%) toonlinear aldehyde (3-acetoxy propanal), which is much higherregioselectivity than recent a considerable impact the hydroformylation of vinyl acetate and provided excellent reports this should be due to the confinement effect of nanotubes.
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