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Keywords:

  • thermal 2-propanol oxidation;
  • polyoxometalates;
  • Au-supported POMs;
  • Ti-substituted POMs;
  • in situ IR investigation

Abstract

In order to investigate the influence of modified Keggin-polyoxometalates and supported gold particles on reactivity and reaction pathways in thermal 2-propanol oxidation, titanium-substituted, insoluble Cs+-salts of the Keggin-heteropolytungstate (H3PW12O40) Cs3PW12O40 1, Cs5PW11TiO40 · nH2O 2, and supported gold composite Au/Cs5PW11TiO40 · nH2O 3 were synthesized and characterized as molecular model catalysts. The Ti-substituted polyoxometalate 2 did not show any observable activity in the gas phase oxidation of 2-propanol. The presence of gold nano-particles activates the supporting polyoxometalate 3 and enhances formation of different oxidation products (acetone, diisopropyl ether) depending on the presence of different types of active sites. The formation of the diisopropyl ether involves two adjacent 2-propanol molecules adsorbed on two different types of active sites, whereas the dehydrogenation reaction for the acetone formation involves the initial adsorption of 2-propanol on one type of active site.