An exhaust gas purification system for lowering the content of impurities in a lean exhaust gas of an internal combustion engine comprising, a feeding device that feeds ammonia or a compound decomposable to ammonia into an exhaust gas stream containing nitrogen oxides; a selective catalytic reduction catalyst comprising vanadium (V-SCR catalyst) which catalyzes the nitrogen oxides with ammonia in a temperature range of about 150° C. to about 400° C. and at an NO.sub.2/NO.sub.x ratio of about 0.3 to about 0.9; and a downstream system comprising a diesel oxidation catalyst.

An exhaust gas purification system for lowering the content of impurities in a lean exhaust gas of an internal combustion engine comprising, a feeding device that feeds ammonia or a compound decomposable to ammonia into an exhaust gas stream containing nitrogen oxides; a selective catalytic reduction catalyst comprising vanadium (V-SCR catalyst) which catalyzes the nitrogen oxides with ammonia in a temperature range of about 150° C. to about 400° C. and at an NO.sub.2/NO.sub.x ratio of about 0.3 to about 0.9; and a downstream system comprising a diesel oxidation catalyst.

A catalyst for decomposing perfluorinated compounds includes an alumina carrier, at least one metal carried on the alumina carrier and selected from the group consisting of Zn, Ni, W, Zr, Ti, Ga, Nb, Co, Mo, V, Cr, Mn, Fe, and Cu, S carried on the alumina carrier, and rare-earth metals carried on the alumina carrier.

A catalyst composition comprising—a support comprising TiO.sub.2,—a composite oxide containing vanadium and antimony, which has a rutile-type structure different from VSbO.sub.4 and V.sub.0.92Sb.sub.0.92O.sub.4 as determined by X-ray diffraction (XRD) analysis with CuKα radiation, and—optionally, one or more selected from the group consisting of oxides of silicon, oxides of vanadium and oxides of antimony, for selective catalytic reduction of nitrogen oxides; to a process for preparing the catalyst composition, to the catalyst composition obtained/obtainable by the process and to use of the same for selective catalytic reduction of nitrogen oxides.

A catalyst composition comprising—a support comprising TiO.sub.2,—a composite oxide containing vanadium and antimony, which has a rutile-type structure different from VSbO.sub.4 and V.sub.0.92Sb.sub.0.92O.sub.4 as determined by X-ray diffraction (XRD) analysis with CuKα radiation, and—optionally, one or more selected from the group consisting of oxides of silicon, oxides of vanadium and oxides of antimony, for selective catalytic reduction of nitrogen oxides; to a process for preparing the catalyst composition, to the catalyst composition obtained/obtainable by the process and to use of the same for selective catalytic reduction of nitrogen oxides.

The present invention pertains to a catalyst for use in the selective catalytic reduction (SCR) of nitrogen oxides comprising a monolithic substrate and a coating A, which comprises an oxidic metal carrier comprising an oxide of titanium and a catalytic metal oxide which comprises an oxide of vanadium wherein the mass ratio vanadium/titanium is 0.07 to 0.26.

The present invention pertains to a catalyst for use in the selective catalytic reduction (SCR) of nitrogen oxides comprising a monolithic substrate and a coating A, which comprises an oxidic metal carrier comprising an oxide of titanium and a catalytic metal oxide which comprises an oxide of vanadium wherein the mass ratio vanadium/titanium is 0.07 to 0.26.

An electrode assembly includes a first electrode and a dielectric layer on the first electrode. The dielectric layer includes a bismuth compound of the formula Bi.sub.2(CrO.sub.4).sub.2Cr.sub.2O.sub.7, Pb.sub.4(BiO.sub.4)(PO.sub.4), Ag.sub.3BiO.sub.3, Bi.sub.2CdO.sub.2(GeO.sub.4), Bi.sub.2Te.sub.4O.sub.11, Cs.sub.6Bi.sub.4O.sub.9, Na.sub.3Bi(PO.sub.4).sub.2, Bi.sub.2(SeO.sub.3).sub.3, or a combination thereof. The electrode assembly can be particularly useful in various electronic devices.

An electrode assembly including a first electrode and a dielectric layer on the first electrode. The dielectric layer comprises a lead-containing compound of the formula PbMgV.sub.2O.sub.7, Pb.sub.2Te.sub.3O.sub.8, PbZnV.sub.2O.sub.7, Na.sub.2PbO.sub.2, PbP.sub.2O.sub.6, PbZnSiO.sub.4, Pb.sub.2In.sub.2Si.sub.2O.sub.9, Pb.sub.6(AsO.sub.4)[B(AsO.sub.4).sub.4], PbAl.sub.2Si.sub.2O.sub.8, K.sub.4PbO.sub.3, Pb.sub.2TiAs.sub.2O.sub.9, Pb.sub.4O(VO.sub.4).sub.2, Rb.sub.4PbO.sub.3, Pb.sub.2V.sub.2O.sub.7, Pb.sub.9Al.sub.8O.sub.21, Nd(Al.sub.3O.sub.6)(Pb.sub.2O.sub.2), Pb.sub.6Co.sub.9(TeO.sub.6).sub.5, Pb.sub.3(B.sub.3O.sub.7)NO.sub.3, a lead-containing oxyhalide of the formula Pb.sub.13(Cl.sub.3O.sub.5).sub.2, Pb.sub.13(Br.sub.3O.sub.5).sub.2, Pb.sub.2OF.sub.2, Pb.sub.2CO.sub.3F.sub.2, Pb(AsO.sub.2).sub.3Cl, Pb.sub.3O.sub.2(OH)Cl, Pb.sub.6(BO.sub.3).sub.3OCl, Pb.sub.2B.sub.5O.sub.9I, Pb.sub.2B.sub.5O.sub.9Br, Pb.sub.2B.sub.5O.sub.9Cl, Pb.sub.5(AsO.sub.3).sub.3Cl, Pb.sub.8Y.sub.6F.sub.32O, Pb(O.sub.2Pb.sub.3).sub.2(BO.sub.3)Br.sub.3, Pb.sub.6LaO.sub.7Cl, a lead-containing phosphate of the formula Pb.sub.2PO.sub.4I, Pb.sub.2InP.sub.3O.sub.11, Pb.sub.2MoP.sub.3O.sub.11, Pb.sub.2Ni(PO.sub.4).sub.2, Pb.sub.2VO(PO.sub.4), K.sub.2Pb(PO.sub.3).sub.4, Pb.sub.3(MoO).sub.3(PO.sub.4).sub.5, Pb.sub.4O(PO.sub.4).sub.2, RbPb(PO.sub.3).sub.3, PbVO.sub.2PO.sub.4, Pb.sub.5(PO.sub.4).sub.3F, Pb.sub.5(PO.sub.4).sub.3Cl, Pb.sub.5(PO.sub.4).sub.3I, PbP.sub.2O.sub.6, or a combination thereof. The electrode assembly can be particularly useful in various electronic devices.

A method for production of vanadium catalysts, including steps of 1) providing a mixture comprising a TiO.sub.2-based support and a composite oxide containing vanadium and antimony; 2) preparing a slurry containing the mixture obtained from step 1), and additive comprising at least one species selected from the group consisting of Si, Al, Zr, Ti, W and Mo, and a solvent; and 3) applying the slurry onto a substrate or processing the slurry into shaped bodies. The vanadium catalysts obtained/obtainable from the method, and use thereof for abatement of nitrogen oxides (NOx).