Supported CuO+Ag/Partially Stabilized Zirconia Catalysts for the Selective Catalytic Reduction of NOx under Lean Burn Conditions

FT-IR spectroscopic investigation of the reactivity of NOx species adsorbed on Cu2+/ZrO2 and CuSO4/ZrO2 catalysts toward decane

“…This catalytic system has a lower activity when propane is used as the reducing agent [1,2]. However, in the presence of silver-promoted CuO supported on mesoporous cubic zirconia (stabilized by BaO), a high level of NO conversion has been observed with both short-and long-chain saturated hydrocarbons [9]. This oxide system approaches the performance of the zirconia-based copper catalyst containing sulfate ions in an amount corresponding to monolayer coverage.…”

“…The results of the structural investigations combined with the performance of the CuO/ZrO 2 catalysts show that isolated copper ions or small 3D clusters are the active sites for the reactions of N 2 O decomposition [18][19][20], reduction of NO by CO [16,17] and SCR of NO with hydrocarbons [1][2][3][5][6][7]9,21] or ammonia [10,21].…”

“…Recent reports have shown that oxide catalysts based on copper-supported on zirconia or sulfated zirconia are promising in the selective catalytic reduction of NO x with hydrocarbons (CH-SCR) and ammonia in an excess of oxygen [1][2][3][4][5][6][7][8][9][10]. In addition, zirconiasupported copper oxide catalysts possess very high activity for NO reduction with CO at low tempera-tures [11][12][13][14][15][16][17] and comparable catalytic behavior with Cu-ZSM5 in the decomposition of N 2 O [18][19][20].…”

NOx SCR by decane and propylene on Pt+Cu/Zr-pillared clays in realistic feeds: Performance and mechanistic features versus structural specificity of nanosized zirconia pillars

“…Cu ($2 wt.%) and/or Pt (0.3 wt.%) were supported by the incipient impregnation with the water solutions of Cu nitrate and H 2 PtCl 6 , respectively, followed by drying and calcination at 500 8C. For comparison, the same amounts of copper and Pt were supported by the identical procedure on the bulk mesoporous zirconia sample (specific surface area 180 m 2 /g) stabilized by addition of 3.3 wt.% Ca [21]. For the same purpose, samples containing 0.5 wt.% Pt were prepared by the incipient wetness impregnation of an industrial A-1 g-Al 2 O 3 support (specific surface area 180 m 2 /g) or alumina-pillared montmorillonite clay (the specific surface area and pore structure parameters being close to those of ZrPILC [22]) with H 2 PtCl 6 solution followed by drying and calcinations at 500 8C.…”

“…Nanosized zirconia pillars propping the clay sheets create galleries with typical sizes in the ultramicropore range [11]. Earlier, these catalysts with supported Pt + Cu were shown to be reasonably active in NO x SCR by propane, propylene and www.elsevier.com/locate/cattod Catalysis Today 114 (2006) [13][14][15][16][17][18][19][20][21][22] decane in dry feeds [12][13][14][15]. Moreover, sulfation of zirconia is known to increase its acidity.…”