Composition-Dependent Performance of CexZr1–xO2 Mixed-Oxide-Supported WO3 Catalysts for the NOx Storage Reduction–Selective Catalytic Reduction Coupled Process

WO3/CexZr1–xO2 materials were evaluated as a possible NH3-selective catalytic reduction (SCR) active catalyst in a NOx storage reduction (NSR) + SCR combined system. The effect of the support composition was investigated at a constant WO3 loading (9.1 wt % of WO3). The impact of WO3 promotion over textural, structural, acid–base, and redox properties of SCR samples was characterized by means of nitrogen adsorption–desorption isotherms, XRD, NOx storage capacity, NH3 temperature programmed desporption, pyridine adsorption followed by FTIR, and H2-TPR. Catalytic activities in NH3-SCR and NH3-SCO reactions as well as corresponding kinetics parameters are also discussed. All WO3/Ce–Zr materials are active and fully selective in N2 for NOx reduction by NH3 and ammonia oxidation by O2. For the SCR reaction, the rate of NO conversion is found approximately half-order with respect to NO, and negative to nearly zero-order with respect to NH3. Tungstated ceria–zirconia materials were then associated downstream with...

[1]  S. Kureti,et al.  Selective catalytic reduction of nitrogen oxides by ammonia on iron oxide catalysts , 2006 .

[2]  Daniel Duprez,et al.  An overview of the production and use of ammonia in NSR + SCR coupled system for NOx reduction from lean exhaust gas , 2012 .

[3]  T. Hoost,et al.  An XRD and TEM Investigation of the Structure of Alumina-Supported Ceria–Zirconia , 1997 .

[4]  A. Wokaun,et al.  The role of Brønsted acidity in the selective catalytic reduction of NO with ammonia over Fe-ZSM-5 , 2009 .

[5]  S. Mansour,et al.  Adsorption and surface reactions of pyridine on pure and doped ceria catalysts as studied by infrared spectroscopy , 1989 .

[6]  Wei Li,et al.  Spatially resolving SCR reactions over a Fe/zeolite catalyst , 2011 .

[7]  Akira Kato,et al.  Reaction between nitrogen oxide (NOx) and ammonia on iron oxide-titanium oxide catalyst , 1981 .

[8]  R. T. Yang,et al.  Catalytic Performance of Fe–ZSM-5 Catalysts for Selective Catalytic Reduction of Nitric Oxide by Ammonia , 1999 .

[9]  Shudong Wang,et al.  WO3/CeO2-ZrO2, a promising catalyst for selective catalytic reduction (SCR) of NOx with NH3 in diesel exhaust. , 2008, Chemical communications.

[10]  O. Kröcher,et al.  The State of the Art in Selective Catalytic Reduction of NOx by Ammonia Using Metal‐Exchanged Zeolite Catalysts , 2008 .

[11]  Hong He,et al.  A superior Ce-W-Ti mixed oxide catalyst for the selective catalytic reduction of NOx with NH3 , 2012 .

[12]  D. Duprez,et al.  Influence of Mn and Fe Addition on the NOx Storage–Reduction Properties and SO2 Poisoning of a Pt/Ba/Al2O3 Model Catalyst , 2009 .

[13]  G. Fei,et al.  Dispersion and reduction of copper oxide supported on WO3-modified Ce(0.5)Zr(0.5)O2 solid solution. , 2005, The journal of physical chemistry. B.

[14]  M. Elsener,et al.  Selective catalytic reduction of NO and NO2 at low temperatures , 2002 .

[15]  K. Shimizu,et al.  Influence of hydrocarbon structure on selective catalytic reduction of NO by hydrocarbons over Cu-Al2O3 , 2002 .

[16]  B. Gates,et al.  Characterization of porous lanthanum oxide catalysts. Microscopic and spectroscopic studies , 1996 .

[17]  J. Ahola,et al.  Reaction mechanism and kinetics of NOx reduction by propene on CoOx/alumina catalysts in lean conditions , 2000 .

[18]  E. Lotero,et al.  A study of platinum supported on tungstated zirconia catalysts , 1996 .

[19]  A. Baiker,et al.  Characterization by temperature programmed reduction , 2000 .

[20]  F. Jaussi,et al.  NOx reduction in the exhaust of mobile heavy-duty diesel engines by urea-SCR , 2004 .

[21]  H. Hattori,et al.  Surface properties of zirconium oxide and its catalytic activity for isomerization of 1-butene , 1979 .

[22]  A. Lemonidou,et al.  Ag/alumina catalysts for the selective catalytic reduction of NOx using various reductants , 2004 .

[23]  H. Calis,et al.  Very active CeO2-zeolite catalysts for NOx reduction with NH3. , 2002, Chemical communications.

[24]  M. A. Hasan,et al.  In situ FTIR spectra of pyridine adsorbed on SiO2-Al2O3, TiO2, ZrO2 and CeO2: general considerations for the identification of acid sites on surfaces of finely divided metal oxides , 2001 .

[25]  D. Duprez,et al.  A study of the ammonia selectivity on Pt/BaO/Al2O3 model catalyst during the NOx storage and reduction process , 2011 .

[26]  G. Busca,et al.  Surface characterization of amorphous alumina and its crystallization products , 1989 .

[27]  M. Elsener,et al.  Reaction Pathways in the Selective Catalytic Reduction Process with NO and NO2 at Low Temperatures , 2001 .

[28]  I. Yentekakis,et al.  A comparative study of the C3H6 + NO + O2, C3H6 + O2 and NO + O2 reactions in excess oxygen over Na-modified Pt/γ-Al2O3 catalysts , 2005 .

[29]  O. Kröcher,et al.  Acidic Zirconia Mixed Oxides for NH 3 -SCR Catalysts for PC and HD Applications , 2011 .

[30]  B. Coq,et al.  Fe-Ce-ZSM-5 a new catalyst of outstanding properties in the selective catalytic reduction of NO with NH(3). , 2004, Chemical communications.

[31]  L. Lietti.  Reactivity of V2O5zWO3TiO2 de-NOx catalysts by transient methods , 1996 .

[32]  D. Duprez,et al.  Role of the alumina surface properties on the ammonia production during the NOx SCR with ethanol over Ag/Al2O3 catalysts , 2011 .

[33]  R. Mccabe,et al.  NOx self-inhibition in selective catalytic reduction with urea (ammonia) over a Cu-zeolite catalyst in diesel exhaust , 2002 .

[34]  E. Tronconi,et al.  NH3–NO/NO2 chemistry over V-based catalysts and its role in the mechanism of the Fast SCR reaction , 2006 .

[35]  D. Duprez,et al.  Cooperative effect of Pt–Rh/Ba/Al and CuZSM-5 catalysts for NOx reduction during periodic lean-rich atmosphere , 2008 .

[36]  James A. Sullivan,et al.  NH3 and urea in the selective catalytic reduction of NOx over oxide-supported copper catalysts , 2005 .

[37]  D. Duprez,et al.  High-surface-area zinc aluminate supported silver catalysts for low-temperature SCR of NO with ethanol , 2012 .

[38]  S. Bennici,et al.  Investigation of the WO3/ZrO2 surface acidic properties for the aqueous hydrolysis of cellobiose , 2012 .

[39]  K. Shimizu,et al.  Comprehensive IR study on acid/base properties of metal oxides , 2012 .

[40]  D. Duprez,et al.  NOx storage and reduction properties of Pt/CexZr1−xO2 mixed oxides: Sulfur resistance and regeneration, and ammonia formation , 2009 .

[41]  R. T. Yang,et al.  MnOx-CeO2 mixed oxides prepared by co-precipitation for selective catalytic reduction of NO with NH3 at low temperatures , 2004 .

[42]  E. Tronconi,et al.  NH3 SCR of NOx for diesel exhausts aftertreatment: role of NO2 in catalytic mechanism, unsteady kinetics and monolith converter modelling , 2007 .

[43]  E. P. Parry,et al.  An infrared study of pyridine adsorbed on acidic solids. Characterization of surface acidity , 1963 .

[44]  Hong He,et al.  Novel cerium-tungsten mixed oxide catalyst for the selective catalytic reduction of NO(x) with NH3. , 2011, Chemical communications.

[45]  D. Duprez,et al.  NOx storage properties of Pt/Ba/Al model catalysts prepared by different methods Beneficial effects of a N2 pre-treatment before hydrothermal aging , 2008 .

[46]  W. Grünert,et al.  Selective catalytic reduction of NO by ammonia over Fe-ZSM-5 catalysts , 1999 .

[47]  M. Ziolek,et al.  Preparation and characterisation of Pt containing NbMCM-41 mesoporous molecular sieves addressed to catalytic NO reduction by hydrocarbons , 2005 .

[48]  Pio Forzatti,et al.  Role of ammonia in the reduction by hydrogen of NOx stored over Pt–Ba/Al2O3 lean NOx trap catalysts , 2008 .

[49]  P. Berge,et al.  The preparation of WO3/TiO2 and Wo3/Al2O3 and characterization by temperature-programmed reduction , 1989 .

[50]  M. Konsolakis,et al.  The Reduction of NO by Propene over Ba-Promoted Pt/γ-Al2O3 Catalysts , 2001 .

[51]  D. Duprez,et al.  A study of the deactivation by sulfur and regeneration of a model NSR Pt/Ba/Al2O3 catalyst , 2005 .

[52]  S. Kawi,et al.  Selective catalytic reduction of NO by hydrocarbons in the presence of excess oxygen using Pt/MCM-41 catalysts , 2003 .

[53]  J. Dumesic,et al.  Acidic properties of binary oxide catalysts. I: Mössbauer spectroscopy and pyridine adsorption for iron supported on silica , 1986 .

[54]  D. Duprez,et al.  Oxygen storage capacity of promoted Rh/CeC2 catalysts. Exceptional behavior of RhCu/CeO2 , 1993 .

[55]  Maofa Ge,et al.  Enhanced activity of tungsten modified CeO2/TiO2 for selective catalytic reduction of NOx with ammonia , 2010 .

[56]  D. Duprez,et al.  Characterisation by TPR, XRD and NOx storage capacity measurements of the ageing by thermal treatment and SO2 poisoning of a Pt/Ba/Al NOx-trap model catalyst , 2004 .

[57]  Paul Joseph Andersen,et al.  Advanced Catalysts for Combined (NAC + SCR) Emission Control Systems , 2010 .

[58]  H. Hattori,et al.  IR study of acid sites on WO3–ZrO2 and Pt/WO3–ZrO2 , 2003 .

[59]  M. Schmal,et al.  Characterization of ceria-coated alumina carrier , 2002 .

[60]  C. Correa,et al.  NO reduction by CH4 over Pd/Co-sulfated zirconia catalysts , 2005 .

[62]  C. Christensen,et al.  Selective catalytic reduction of NO by ammonia using mesoporous Fe-containing HZSM-5 and HZSM-12 zeolite catalysts: An option for automotive applications , 2007 .

[63]  U. Ozkan,et al.  Investigation of the Reaction Pathways in Selective Catalytic Reduction of NO with NH3 over V2O5 Catalysts: Isotopic Labeling Studies Using 18O2, 15NH3, 15NO, and 15N18O , 1994 .

[64]  B. Gates,et al.  Surface and Catalytic Properties of Yttrium Oxide: Evidence from Infrared Spectroscopy , 1998 .

[65]  E. Weitz,et al.  The role of NO in the mechanism of NOx reduction with ammonia over a BaNa-Y catalyst , 2005 .

[66]  Krishna Kamasamudram,et al.  Mechanistic investigation of hydrothermal aging of Cu-Beta for ammonia SCR , 2011 .

[67]  D. Duprez,et al.  Effect of the preparation method on the properties of zirconia-ceria materials , 1999 .

[68]  P. Forzatti,et al.  Fourier transform-infrared study of the adsorption and coadsorption of nitric oxide, nitrogen dioxide and ammonia on vanadia-titania and mechanism of selective catalytic reduction , 1990 .