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NH3 TPD study and thermal behaviour of vanadium-exchanged titanium phosphates as catalysts
Authors:M Turco  G Bagnasco  G Russo  P Ciambelli  P Patrono  M A Massucci  S Vecchio
Institution:(1) Dipartimento di Ingegneria Chimica, Università lsquoFederico IIrsquo, 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 lsquoLa Sapienzarsquo, P.le Aldo Moro, 5-00185 Roma, Italy
Abstract: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.
Keywords:layered metal phosphates  NO reduction  vanadium
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