Preparation and performance of a silica-supported V2O5 on TiO2 catalyst for the selective reduction of NO with NH3

A preparation technique is described in which a layer of TiO2 completely covering the support can be deposited onto silica. Onto the support thus modified, V2O5 can be applied to result in a catalyst suitable for the selective catalytic reduction (SCR) of NOx with NH3. To obtain the required selectivity in the reduction of NOx the silica surface must be completely covered with TiO2. Catalysts prepared according to the above procedure exhibit good activity and a completely selective reduction of NO to N2 at temperatures to 350 °C. At higher temperatures selective oxidation of the NH3 to N2 is observed.

[1]  W. H. Lewis,et al.  Nitrogen oxides control and removal: Recent developments , 1979 .

[2]  A. Miyamoto,et al.  DETERMINATION OF THE NUMBER OF VANADIUM=OXYGEN SPECIES ON THE SURFACE OF VANADIUM OXIDE CATALYSTS. 1. UNSUPPORTED VANADIUM PENTOXIDE AND VANADIUM PENTOXIDE/TITANIUM DIOXIDE TREATED WITH AN AMMONIACAL SOLUTION , 1981 .

[3]  J. Geus,et al.  Preparation of highly loaded vanadium oxide―silica catalysts , 1988 .

[4]  J. Chien.  Study of surface structures of submicron metal oxides by vanadium tetrachloride as a paramagnetic probe , 1971 .

[5]  Hans Bosch,et al.  The activity of supported vanadium oxide catalysts for the selective reduction of NO with ammonia , 1986 .

[6]  G. Bond,et al.  The vanadium pentoxide-titanium dioxide system: Structural investigation and activity for the oxidation of butadiene , 1979 .

[7]  C. U. Ingemar Odenbrand,et al.  Catalytic reduction of nitrogen oxides 1. The reduction of NO , 1985 .

[8]  Shirley S. Chan,et al.  The interaction of V2O5 with Ti02(anatase): Catalyst evolution with calcination temperature and O-xylene oxidation , 1986 .

[9]  K. Fujimoto,et al.  Reduction of nitric oxide with ammonia on vanadium oxide catalysts supported on homogeneously precipitated silica-titania , 1981 .

[10]  H. Krauss,et al.  Über Oberflächenverbindungen von Übergangsmetallen. XIV. Koordinative ungesättigte Oberflächenverbindungen von Vanadium(III) auf Silicagel , 1976 .

[11]  Satoru Kurita,et al.  The effect of the vanadium component on the life of the WO3-TiO2 catalyst used for the reduction of NOx with NH3. , 1982 .

[12]  F. Roozeboom,et al.  Vanadium oxide monolayer catalysts. I. Preparation, characterization, and thermal stability , 1979 .

[13]  G. Bond,et al.  Selective oxidation of o-xylene by monolayer V2O5–TiO2 catalysts , 1981 .