Abstract
Tungstocobalate (Co III W 12 O 40 5- ) intercalated ZnAl-layered double hydroxide (ZnAl-CoW 12 ) was prepared via rehydration of calcined ZnAl-LDH under N 2 atmosphere. Characterization by chemical analysis together with powder XRD, FT-IR, TG-DTA and UV-VIS DRS provided evidence of intercalation of Co III W 12 O 40 5- (58 wt. %) in the interlayer of LDH. The catalytic activity of ZnAl-CoW 12 was evaluated for hydrogen peroxide mediated decolourisarion of methyl orange and oxidation of benzaldehyde to benzoic acid under varying reaction conditions. ZnAl-CoW 12 was found effective for both the reactions and stable under the experimental conditions for repetitive use without any noticeable decrease in activity.
Highlights
LAYERED DOUBLE HYDROXIDETungstocobalate, (CoIIIW12O40)5-, intercalated ZnAl-layered double hydroxide (ZnAl-CoW12) was prepared via rehydration of calcined ZnAl-Layered double hydroxides (LDHs) under nitrogen atmosphere
In order to avoid the loss of POMs in reaction medium and increase the surface area for widening their practical applications, POMs are often supported on different solid supports like silica, alumina, resin, clays, zeolites and molecular sieves.[9,10,11,12,13,14,15]
A variety of structurally different iso- and heterpolyoxometallates with varying metal have been intercalated in the interlayer of Layered double hydroxides (LDHs) and their catalytic properties have been studied by several workers.[12,19,20,21,22,23,24]
Summary
Tungstocobalate, (CoIIIW12O40)5-, intercalated ZnAl-layered double hydroxide (ZnAl-CoW12) was prepared via rehydration of calcined ZnAl-LDH under nitrogen atmosphere. Characterization by chemical analysis together with powder XRD, FT-IR, TG-DTA and UV-VIS DRS provided evidence of intercalation of CoIIIW12O405- The catalytic activity of ZnAl-CoW12 was evaluated for hydrogen peroxide mediated decolourisarion of methyl orange and oxidation of benzaldehyde to benzoic acid under varying reaction conditions. ZnAl-CoW12 was found effective for both the reactions and stable under the experimental conditions for repetitive use without any noticeable decrease in activity. ZnAl-layered double hydroxide (ZnAl-LDH), characterization of resulted intercalated sample by various physicochemical methods and evaluation of its catalytic activity for oxidative decolourisation methyl orange (MO) and oxidation benzaldehyde to benzoic acid as the model reactions
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