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  • 1 Dipartimento di Ingegneria Chimica Università ‘Federico II’ P.le Tecchio, 80 80125 Naples
  • | 2 Dipartimento di Ingegneria Chimica ed Alimentare Università di Salerno 80084 Fisciano SA
  • | 3 I.M.A.I.-C.N.R. Area della Ricerca di Roma Via Salaria Km 29.6 00016 Monterotondo, Scalo, Roma
  • | 4 Dipartimento di Chimica Università di Roma ‘La Sapienza’ P.le Aldo Moro 5-00185 Roma Italy
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The ion exchange technique was employed for the preparation of VO2+ modified titanium phosphates as catalysts for the selective reduction of NO with NH3. The samples were prepared by contacting with a vanadyl sulphate solution different precursor materials, amorphous, crystalline or sodium half exchanged titanium phosphate. The vanadium contents of modified phosphates were in the range 0.08–2.3 wt%. XRD and thermal analysis TG/DTA showed that vanadium loading does not cause structural modification in hydrogen titanium phosphate. A vanadyl containing phase was obtained when half sodium titanium phosphate was employed. The NH3 TPD measurements indicated the presence of a wide distribution of NH3 adsorbing sites with medium-high strength. Catalytic activity measurements were performed under dilute conditions. It was found that the presence of vanadium even in low amounts strongly promote the catalytic activity.