Abstract
A novel 12-molybdophosphoric acid (HPM)-based complex (H2PI)2(H3O)[PMo12O40][Mo2O5(H2O)2(PI)2]·11H2O (PI-HPM) was prepared by modification with picolinic acid (HPI) and characterized by the methods of Fourier transform infrared (FTIR) spectroscopy, thermogravimetry (TG), X-ray powder and single crystal diffraction. The complex retained the classical Keggin structure of bulk HPM, there were some strong hydrogen bonds existing between the [PMo12O40]3- polyanion, the [Mo2O5(H2O)2(PI)2] coordination moiety, the protonated HPI and the lattice water molecules. Then PI-HPM was employed as heterogeneous catalyst for esterification reaction to evaluate its acid-catalytic activity. The complex exhibited high activity and good durability in reaction mixtures, indicating that it was a promising heterogeneous acid catalyst for esterification that including the conversion of oleic acid to oleates.
Highlights
Conventional acid catalysts that are widely used in industries are mineral acids, such as H2SO4, H3PO4, HCl, CF3COOH and ClSO2OH.[6,7]
The prepared complex was applied in esterification as heterogeneous catalyst to evaluate acid-catalytic activity
One PO4 tetrahedron and twelve MoO6 octahedra from four Mo3O13 groups shared corners and made up the Keggin‐type [PMo12O40] cluster
Summary
Acid catalyzed reaction is one of the most important reactions, including esterification, acetalization, etherification, nitration reaction and so on.[1,2,3,4,5] Conventional acid catalysts that are widely used in industries are mineral acids, such as H2SO4, H3PO4, HCl, CF3COOH and ClSO2OH.[6,7] These liquid acids have excellent catalytic activities, but they suffer from several drawbacks, such as the corrosiveness, the existence of side reactions and difficulty of separation from the reaction mixtures.[7,8] Due to stringent and growing environmental regulations, the chemical industry needs the development of environmentfriendly synthetic methodologies. The prepared complex was applied in esterification as heterogeneous catalyst to evaluate acid-catalytic activity.
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