Thermal Stability and Acidity of Silica Supported Keggin Type Polyoxometalate K4[-SiW12O40]•nH2O
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Abstract
Silica supported polyoxometalate K 4 [a-SiW 12 O 40 ]·nH 2 O was prepared systematically using tetraethyl ortho silicate by sol gel method to form K 4 [a-SiW 12 O 40 ]·nH 2 O/Si. Compound K 4 [a-SiW 12 O 40 ]·nH 2 O/Si was characterized by diffraction, spectroscopic, and acidity analyses follow by thermal activity test at higher temperature up to 600 o C. Analysis of FTIR spectrum showed all unique vibration of polyoxometalate K 4 [a-SiW 12 O 40 ]·nH 2 O was appeared at wavenumber 800-1000 cm -1 before and after supporting process. Crystallinity of K 4 [a-SiW 12 O 40 ]·nH 2 O and K 4 [a-SiW 12 O 40 ]·nH 2 O/Si were also similar without changing Keggin structure. Compound K 4 [a-SiW 12 O 40 ]·nH 2 O/Si showed higher acidity than K 4 [a-SiW 12 O 40 ]·nH 2 O probably due to Lewis acidity species. Keggin structure of K 4 [a-SiW 12 O 40 ]·nH 2 O/Si was still retained up to 600 o C showing thermal stability of K 4 [a-SiW 12 O 40 ]·nH 2 O/Si at high temperature. Keyword : Keggin polyoxometalate, tetraethyl ortho silicate, thermal stability, acidity
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