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Acid-base properties of bulk 12mmgstophosphoric heteropolyacid (HPWA) and HPWA supported on alumina and fluorinated alumina ~,ere studied by DRIFT spectroscopy using adsorption of probe molecules. Catalytic properties of Pt-containing catalysts carried by these supporls were studied in n-pentane isomerization. It v, as shown that the PtiHPWA/,~I20 ~ system is almost inactive in isomerization as a result of the interaction of HPWA with basic sites of the a~umina support. On the comrary, the presence of acidic sites in fluorinated alumina pre,,ents HPVVA destruction and favors the uniG~rm distribution of HPWA on the support surface. As a result, enhancement of the activity and selectivity of the Pt/HPWA/ AI203--F catalyst m n-pentane isomerization is observed.

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