Heterogenization of 12-tungstophosphoric acid on stabilized zeolite Y

12-tungstophosphoric acid (PW12) has been supported on dealuminated zeolite Y, containing a secondary pore system with the predominant pore radii of 1 5 Angstrom. The interaction between the heteropolyacid and the zeolite matr ix has been studied using Si-29, Al-27 and P-31 MAS NMR. Distribution of tw o types of the Keggin anions, strongly and weakly interacting with the supp ort, has been estimated quantitatively. Increased acidic properties of the PW12/zeolite Y system were demonstrated by a change in the selectivity patt ern of m-xylene transformations in the gas phase (significantly increased d ealkylation and transalkylation paths at the expense of isomerization). Red ox properties were evaluated in oxidation reactions with H2O2 in the liquid phase. It has been shown that the PW12/zeolite Y catalysts can selectively oxidize a number of organic compounds at relatively low temperatures.