A review of selective catalytic reduction of nitrogen oxides with hydrogen and carbon monoxide

Abstract The selective reduction of NO with hydrogen (H2-SCR) and CO (CO-SCR) over platinum group metal catalysts in the presence of O2 is overviewed. In the case of H2-SCR, Pt and Pd show high activity at low temperatures. The acidity of the support material greatly affects NO reduction activity and selectivity to N2/N2O. Although the activity of Ir and Rh for H2-SCR is low, coexisting SO2 in the reaction gas considerably promotes NO reduction. The best support for Ir and Rh is SiO2. Li and Zn additives improve the activity of Ir/SiO2 and Rh/SiO2, respectively, by maintaining the active reduced metal state. For CO-SCR, on the other hand, Ir is almost the only active metal species. Coexisting SO2 is also essential for CO-SCR on Ir/SiO2 to occur. The role of SO2 for both H2-SCR and CO-SCR on Ir/SiO2 is to keep Ir in the form of the catalytically active Ir metal state. The additions of WO3 and Nb2O5 considerably promote the activity of Ir/SiO2 for CO-SCR, catalyzing CO-SCR even in the absence of SO2. Ir metal interacting strongly with W oxide is the active species on WO3-promoted Ir/SiO2. Furthermore, the addition of Ba improves the performance of Ir/WO3/SiO2 catalyst.

[1]  K. Polychronopoulou,et al.  An Investigation of the NO/H2/O2 (Lean De-NOx) Reaction on a Highly Active and Selective Pt/La0.7Sr0.2Ce0.1FeO3 Catalyst at Low Temperatures , 2002 .

[2]  K. Chuang,et al.  Control of nitrogen oxide (NOx) emissions by selective catalytic reduction with hydrogen over hydrophobic catalysts , 1989 .

[3]  A. Obuchi,et al.  Enhancement of activity of Ir catalysts for selective catalytic reduction of NO with CO by physical mixing with SiO2 , 2010 .

[4]  T. Fujitani,et al.  Effect of iridium dispersion on the catalytic activity of Ir/SiO2 for the selective reduction of NO with CO in the presence of O2 and SO2 , 2006 .

[5]  M. Arai,et al.  A Highly Active Ir/WO3 Catalyst for the Selective Reduction of NO by CO in the Presence of O2 or O2 + SO2 , 2005 .

[6]  T. Fujitani,et al.  Enhancing Effect of H2 on the Selective Reduction of NO with CO over Ba-doped Ir/WO3/SiO2 Catalyst , 2007 .

[7]  C. Costa,et al.  Pt/Mg-Ce-O catalyst for NO/H2/O2 lean de-Nox reaction , 2004 .

[8]  M. Arai,et al.  An Ir/WO3 catalyst for selective reduction of NO with CO in the presence of O2 and/or SO2 , 2007 .

[9]  M. Shimokawabe,et al.  Selective Catalytic Reduction of NO by CO over Supported Iridium and Rhodium Catalysts , 2004 .

[10]  W. H. Weinberg,et al.  Adsorption of carbon monoxide on Ir(110) investigated by infrared reflection-absorption spectroscopy , 1995 .

[11]  H. Hamada,et al.  Rh/SiO2 Catalysts for Selective Reduction of NO with H2 in the Presence of SO2 and O2 , 2003 .

[12]  功一 中村,et al.  Ir および Rh 表面上での NO および CO の吸着・反応特性 , 2009 .

[13]  Norimasa Iida,et al.  Autoignition and Combustion of Natural Gas in 4 Stroke HCCI Engine , 2001 .

[14]  D. Ferri,et al.  Flame-synthesized LaCoO3-supported Pd 2. Catalytic behavior in the reduction of NO by H2 under lean conditions , 2007 .

[15]  T. Fujitani,et al.  Excellent Promoting Effect of Ba Addition on the Catalytic Activity of Ir/WO3–SiO2 for the Selective Reduction of NO with CO , 2006 .

[16]  Tsunehiro Tanaka,et al.  NO reduction with CO in the presence of O2 over Al2O3-supported and Cu-based catalysts , 2002 .

[17]  Tao Zhang,et al.  Unique properties of Ir/ZSM-5 catalyst for NO reduction with CO in the presence of excess oxygen , 2003 .

[18]  T. Fujitani,et al.  Adsorption and reactions of NO on clean and CO-precovered Ir(111). , 2005, The journal of physical chemistry. B.

[19]  T. Fujitani,et al.  Promotive effect of Nb2O5 on the catalytic activity of Ir/SiO2 for NO reduction with CO under oxygen-rich conditions , 2007 .

[20]  D. Fino,et al.  NO SCR reduction by hydrogen generated in line on perovskite-type catalysts for automotive diesel exhaust gas treatment , 2010 .

[21]  Cristina Costa,et al.  An Investigation of the NO/H2/O2 (Lean-deNOx) Reaction on a Highly Active and Selective Pt/La0.5Ce0.5MnO3 Catalyst , 2001 .

[22]  T. Jacob,et al.  Structure Sensitivity in Adsorption and Decomposition of NO on Ir , 2008 .

[23]  C. Costa,et al.  Mechanistic Aspects of the H2-SCR of NO on a Novel Pt/MgO−CeO2 Catalyst , 2007 .

[24]  Landong Li,et al.  NO selective reduction by hydrogen on potassium titanate supported palladium catalyst , 2008 .

[25]  M. Coleman,et al.  An Investigation of Promoter Effects in the Reduction of NO by H2 under Lean-Burn Conditions , 2002 .

[26]  R. Burch.  An investigation of the NO/H2/O2 reaction on noble-metal catalysts at low temperatures under lean-burn conditions , 1999 .

[27]  F. Meunier,et al.  A review of the selective reduction of NOx, with hydrocarbons under lean-burn conditions with non-zeolitic oxide and platinum group metal catalysts , 2002 .

[28]  R. T. Yang,et al.  Selective catalytic reduction of nitric oxide with hydrogen over Pd based catalysts , 2006 .

[29]  M. J. Weaver,et al.  Spatial structure of ordered electrochemical adlayers from in situ scanning tunneling microscopy and infrared spectroscopy: single-site carbon monoxide binding on iridium(111) and comparisons with related systems , 2000 .

[30]  A. M. Efstathiou,et al.  The influence of reaction temperature on the chemical structure and surface concentration of active NOx in H2-SCR over Pt/MgOCeO2: SSITKA-DRIFTS and transient mass spectrometry studies , 2008 .

[31]  A. Obuchi,et al.  Improvements in the N2 selectivity of Pt catalysts in the NO–H2–O2 reaction at low temperatures , 2003 .

[32]  M. Itoh,et al.  Hydrogen Selective Catalytic Reduction of NOx Assisted by In Situ Ammonia Formation over Pt Catalyst Supported on Fe-doped Tin Phosphate , 2008 .

[33]  M. Arai,et al.  Selective reduction of NO with CO in the presence of O2 with Ir/WO3 catalysts: Influence of preparation variables on the catalytic performance , 2008 .

[34]  T. Fujitani,et al.  Adsorption and reactivity of SO2 on Ir(111) and Rh(111) , 2007 .

[35]  P. Smirniotis,et al.  Selective Reduction of NO with CO Over Titania Supported Transition Metal Oxide Catalysts , 2008 .

[36]  Zhiming Liu,et al.  Recent Advances in Catalytic DeNOX Science and Technology , 2006 .

[37]  H. Hamada,et al.  Remarkable promoting effect of coexisting SO2 on the catalytic activity of Ir/SiO2 for NO reduction in the presence of oxygen , 2001 .

[38]  F. Rojas,et al.  Studies of sol–gel TiO2 and Pt/TiO2 catalysts for NO reduction by CO in an oxygen-rich condition , 2004 .

[39]  A. Tsolakis,et al.  The effect of H2 and CO on the selective catalytic reduction of NOx under real diesel engine exhaust conditions over Pt/Al2O3 , 2007 .

[40]  T. Jacob,et al.  Reduction of NO by CO on unsupported Ir: bridging the materials gap. , 2010, Chemphyschem : a European journal of chemical physics and physical chemistry.

[41]  Mordecai Shelef,et al.  Selective catalytic reaction of hydrogen with nitric oxide in the presence of oxygen , 1971 .

[42]  P. Millington,et al.  Selective reduction of nitrogen oxides by hydrocarbons under lean-burn conditions using supported platinum group metal catalysts , 1995 .

[43]  H. Yahiro,et al.  Novel catalytic decomposition and reduction of NO , 1994 .

[44]  M. Itoh,et al.  Lean NOx Reduction by Hydrogen over Pt-Supported Rare Earth Oxide Catalysts and Their In Situ DRIFTs Study , 2009 .

[45]  H. Hamada,et al.  Zn-promoted Rh/SiO2 catalyst for the selective reduction of NO with H2 in the presence of O2 and SO2 , 2005 .

[46]  H. Hamada,et al.  Activity Enhancement of WO3-Promoted Ir/SiO2 Catalysts by High-Temperature Calcination for the Selective Reduction of NO with CO , 2009 .

[47]  G. Emig,et al.  Kinetics and mechanism of the reduction of nitric oxides by H2 under lean-burn conditions on a Pt–Mo–Co/α-Al2O3 catalyst , 1998 .

[48]  M. Ogura,et al.  Catalytic activity of Ir for NO-CO reaction in the presence of SO2 and excess oxygen , 2000 .

[49]  D. King,et al.  Model car-exhaust catalyst studied by TPD and TP-RAIRS : Surface reactions of NO on clean and O-covered Ir{100} , 2005 .

[50]  H. Hamada.  Selective reduction of NO by hydrocarbons and oxygenated hydrocarbons over metal oxide catalysts , 1994 .

[51]  T. Fujitani,et al.  Promotional effect of SO2 on the activity of Ir/SiO2 for NO reduction with CO under oxygen-rich conditions , 2005 .

[52]  T. Kijima,et al.  Low temperature catalytic NOx–H2 reactions over Pt/TiO2-ZrO2 in an excess oxygen , 2001 .

[53]  N. R. Avery,et al.  Adsorption of N2, O2, N2O and NO on Ir(111) by EELS and TPD , 1990 .

[54]  Bin Wen.  NO reduction with H2 in the presence of excess O2 over Pd/MFI catalyst , 2002 .

[55]  L. Murrell,et al.  The NOCO reaction in the presence of excess O2 as catalyzed by iridium , 1976 .

[56]  T. Fujitani,et al.  Reaction properties of NO and CO over an Ir(211) surface , 2007 .

[57]  H. Hamada,et al.  Promotional role of H2O in the selective catalytic reduction of NO with CO over Ir/WO3/SiO2 catalyst , 2010 .

[58]  A. Obuchi,et al.  Formation of active sites on Ir/WO3–SiO2 for selective catalytic reduction of NO by CO , 2008 .

[59]  A. Megaritis,et al.  The influence of H2 and CO on diesel engine combustion characteristics, exhaust gas emissions, and after treatment selective catalytic NOx reduction , 2007 .

[60]  T. Fujitani,et al.  Adsorption Behavior and Reaction Properties of NO and CO on Ir(111) and Rh(111) , 2009 .

[61]  E. Tollefson,et al.  Catalytic reduction of nitric oxide in the presence of oxygen in low concentration high velocity gas streams , 1975 .

[62]  T. Fujitani,et al.  Enhanced activity of Ba-doped Ir/SiO2 catalyst for NO reduction with CO in the presence of O2 and SO2 , 2006 .

[63]  A. Obuchi,et al.  A pathway of NO–H2–O2 reaction over Pt/ZrO2 through ammonium nitrate , 2007 .

[64]  T. Fujitani,et al.  Role of tungsten in promoting selective reduction of NO with CO over Ir/WO3–SiO2 catalysts , 2006 .

[65]  A. Obuchi,et al.  Enhancement of Activity of Ir Catalysts for the Selective Catalytic Reduction of NO by CO , 2006 .

[66]  R. T. Yang,et al.  Catalytic reduction of nitric oxide with hydrogen and carbon monoxide in the presence of excess oxygen by Pd supported on pillared clays , 2004 .

[67]  C. Costa,et al.  Industrial H2-SCR of NO on a novel Pt/MgO–CeO2 catalyst , 2007 .

[68]  W. H. Weinberg,et al.  Effect of preadsorbed oxygen on the adsorption of CO on Ir(110) , 1997 .

[69]  L. Lefferts,et al.  Influence of NO on the Reduction of NO2 with CO over Pt/SiO2 in the Presence of O2 , 2007 .

[70]  H. Hamada,et al.  Promoting Effect of Coexisting H2O on the Activity of Ir/WO3/SiO2 Catalyst for the Selective Reduction of NO with CO , 2008 .

[71]  H. Hamada,et al.  Positive effect of coexisting SO2 on the activity of supported iridium catalysts for NO reduction in the presence of oxygen , 2003 .

[72]  A. Ueda,et al.  Two conversion maxima at 373 and 573K in the reduction of nitrogen monoxide with hydrogen over Pd/TiO2 catalyst , 1998 .

[73]  M. J. Weaver,et al.  Coverage-Dependent Infrared Spectroscopy of Carbon Monoxide on Iridium(111) in Aqueous Solution: A Benchmark Comparison between Chemisorption in Ordered Electrochemical and Ultrahigh-Vacuum Environments , 1998 .

[74]  C. Costa,et al.  Transient Isotopic Kinetic Study of the NO/H2/O2(Lean de-NOx) Reaction on Pt/SiO2and Pt/La−Ce−Mn−O Catalysts , 2004 .

[75]  T. Fujitani,et al.  Kinetics and mechanism of NO reduction with CO on Ir surfaces , 2008 .

[76]  T. Nakatsuji,et al.  A selective NOx reduction on Rh-based catalysts in lean conditions using CO as a main reductant , 2008 .

[77]  R. Burch,et al.  Knowledge and Know‐How in Emission Control for Mobile Applications , 2004 .

[78]  N. Mizuno,et al.  INFLUENCE OF SULFUR DIOXIDE ON CATALYTIC REMOVAL OF NITRIC OXIDE OVER COPPER ION-EXCHANGED ZSM-5 ZEOLITE , 1991 .

[79]  Landong Li,et al.  Study on Pt/Al-MCM-41 for NO selective reduction by hydrogen , 2010 .

[80]  Tsunehiro Tanaka,et al.  NO Reduction with CO in the Presence of O2 over Cu/Al2O3 (3) – Structural Analysis of Active Species by Means of XAFS and UV/VIS/NIR Spectroscopy , 2002 .

[81]  Lifang Chen,et al.  Surfactant-controlled synthesis of Pd/Ce0.6Zr0.4O2 catalyst for NO reduction by CO with excess oxygen , 2005 .

[82]  T. Fujitani,et al.  Adsorption behavior and reaction properties of NO and CO on Rh(1 1 1) , 2006 .

[83]  K. Yokota,et al.  Catalytic removal of nitric oxide with hydrogen and carbon monoxide in the presence of excess oxygen , 1997 .

[84]  H. Hamada,et al.  Ir/SiO2 as a highly active catalyst for the selective reduction of NO with CO in the presence of O2 and SO2. , 2003, Chemical communications.

[85]  H. Yoshida,et al.  Factors Controlling Activity and Selectivity for SCR of NO by Hydrogen over Supported Platinum Catalysts , 2004 .

[86]  Jeong-Rang Kim,et al.  Selective catalytic reduction of NO with CO on Pt/W–Ce–Zr catalysts , 2009 .