Effect of the calcination temperature on the performance of a CeMoOx catalyst in the selective catalytic reduction of NOx with ammonia

Abstract The effect of the calcination temperature on the structure and the catalytic performance of a CeMoOx mixed oxide catalyst in the selective catalytic reduction (SCR) of NOx with NH 3 has been investigated. Compared to the catalyst calcined at 400 °C, the one calcined at 500 °C shows a performance of a slightly lower NOx conversion in the reaction temperature range below 200 °C, and a higher NOx conversion above 350 °C. However, further increase of the calcination temperature to 600 and 700 °C leads to a drop of the NOx conversion and the N 2 selectivity in both the low and high reaction temperature ranges. For the samples calcined at 600 and 700 °C, Mo significantly enriches on the surface. These samples also favor the formation of N 2 O, and show a poor redox ability in NO oxidation reaction. The low ratio and low mobility of the surface chemisorbed oxygen correlates to the poor redox ability of the samples calcined at high temperatures. Furthermore, an abrupt drop of the surface area for the sample calcined at 600 °C is observed and the destruction of acid sites during the high temperature calcination also recorded.

[1]  J. Schwank,et al.  Reactivity of NH3 over (Fe)/H-ZSM-5 zeolite: Studies of temperature-programmed and steady-state reactions , 2011 .

[2]  Hendrik I. Smit,et al.  Mechanism of Selective Catalytic Reduction of NO with NH3 over MnOX/Al2O3, I. Adsorption and Desorption of the Single Reaction Components , 1997 .

[3]  K. Cen,et al.  The activity and characterization of CeO2-TiO2 catalysts prepared by the sol-gel method for selective catalytic reduction of NO with NH3. , 2010, Journal of hazardous materials.

[4]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[5]  A. Megaritis,et al.  Low temperature exhaust gas fuel reforming of diesel fuel , 2004 .

[6]  Zhichun Si,et al.  Lattice oxygen mobility and acidity improvements of NiO–CeO2–ZrO2 catalyst by sulfation for NOx reduction by ammonia , 2013 .

[7]  Yue Liu,et al.  The enhanced performance of ceria with surface sulfation for selective catalytic reduction of NO by NH3 , 2010 .

[8]  G. Busca,et al.  Ammonia activation over catalysts for the selective catalytic reduction of NOx and the selective catalytic oxidation of NH3. An FT-IR study , 1996 .

[9]  Jun Wang,et al.  Catalytic performance and hydrothermal durability of CeO2–V2O5–ZrO2/WO3–TiO2 based NH3-SCR catalysts , 2012 .

[10]  F. Qiu,et al.  Promotional effects of carbon nanotubes on V2O5/TiO2 for NOX removal. , 2011, Journal of hazardous materials.

[11]  M. Daturi,et al.  The NO/NOx ratio effect on the NH3-SCR efficiency of a commercial automotive Fe-zeolite catalyst studied by operando IR-MS , 2012 .

[12]  Hong He,et al.  Selective catalytic reduction of NO by NH3 over a Ce/TiO2 catalyst , 2008 .

[13]  R. T. Yang,et al.  Low-temperature selective catalytic reduction of NOx with NH3 over metal oxide and zeolite catalysts—A review , 2011 .

[14]  P. Gilot,et al.  A review of NOx reduction on zeolitic catalysts under diesel exhaust conditions , 1997 .

[15]  Jyh-Ping Chen,et al.  Role of WO3 in mixed V2O5-WO3/TiO2catalysts for selective catalytic reduction of nitric oxide with ammonia , 1992 .

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

[17]  G. Graham,et al.  Characterization of model automotive exhaust catalysts: Pd on ceria and ceria–zirconia supports , 1999 .

[18]  Junhua Li,et al.  The relationship between structure and activity of MoO3-CeO2 catalysts for NO removal: influences of acidity and reducibility. , 2013, Chemical communications.

[19]  Zhihang Chen,et al.  Low-Temperature Selective Catalytic Reduction of NOx with NH3 over Fe–Mn Mixed-Oxide Catalysts Containing Fe3Mn3O8 Phase , 2012 .

[20]  D. Resasco,et al.  Correlation between catalytic activity and support reducibility in the CO2 reforming of methane over Pt/CexZr1−xO2 catalysts , 2001 .

[21]  Maofa Ge,et al.  CeO2–WO3 Mixed Oxides for the Selective Catalytic Reduction of NOx by NH3 Over a Wide Temperature Range , 2011 .

[22]  Yue Liu,et al.  Selective catalytic reduction of NO over carbon nanotubes supported CeO2 , 2011 .

[23]  Maofa Ge,et al.  DRIFT study on cerium-tungsten/titania catalyst for selective catalytic reduction of NOx with NH3. , 2010, Environmental science & technology.

[24]  F. Larachi,et al.  Composition–activity effects of Mn–Ce–O composites on phenol catalytic wet oxidation , 2001 .

[25]  Hua Wang,et al.  Transformation of methane into synthesis gas using the redox property of Ce–Fe mixed oxides: Effect of calcination temperature , 2011 .

[26]  Zhichun Si,et al.  Modifications of CeO2–ZrO2 solid solutions by nickel and sulfate as catalysts for NO reduction with ammonia in excess O2 , 2010 .

[27]  Yue Liu,et al.  Ceria supported on sulfated zirconia as a superacid catalyst for selective catalytic reduction of NO with NH3. , 2013, Journal of colloid and interface science.

[28]  R. T. Yang,et al.  Characterization and FTIR Studies of MnOx−CeO2 Catalyst for Low-Temperature Selective Catalytic Reduction of NO with NH3 , 2004 .

[29]  Fei Li,et al.  A Novel Ce-P-O Catalyst for the Selective Catalytic Reduction of NO with NH3 , 2010 .

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

[31]  Asghar Karami,et al.  The influence of chromium substitution on an iron–titanium catalyst used in the selective catalytic reduction of NO , 2012 .

[32]  R. T. Yang,et al.  Selective Catalytic Oxidation of Ammonia to Nitrogen over Fe2O3–TiO2 Prepared with a Sol–Gel Method , 2002 .

[33]  Kiyotaka Asakura,et al.  Influence of calcination temperature on iron titanate catalyst for the selective catalytic reduction of NOx with NH3 , 2011 .

[34]  D. Weng,et al.  Modification of CeO2–ZrO2 mixed oxides by coprecipitated/impregnated Sr: Effect on the microstructure and oxygen storage capacity , 2008 .

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

[36]  P. Forzatti,et al.  Characterization and Reactivity of V2O5–MoO3/TiO2 De-NOx SCR Catalysts , 1999 .

[37]  Hong He,et al.  An environmentally-benign CeO2-TiO2 catalyst for the selective catalytic reduction of NOx with NH3 in simulated diesel exhaust , 2012 .

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

[39]  A. Riisager,et al.  The Effect of Acidic and Redox Properties of V2O5/CeO2–ZrO2 Catalysts in Selective Catalytic Reduction of NO by NH3 , 2009 .

[40]  Maofa Ge,et al.  Mechanism of Selective Catalytic Reduction of NOx with NH3 over CeO2-WO3 Catalysts , 2011 .

[41]  Ji Man Kim,et al.  Manganese oxide catalysts for NOx reduction with NH3 at low temperatures , 2007 .

[42]  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.

[43]  A. Bueno-López,et al.  Combined removal of diesel soot particulates and NOx over CeO2–ZrO2 mixed oxides , 2008 .

[44]  J. Fierro,et al.  Study of the surface and redox properties of ceria–zirconia oxides , 2008 .

[45]  L. Fu,et al.  Influence of calcination temperature on Fe/HBEA catalyst for the selective catalytic reduction of NOx with NH3 , 2012 .

[46]  Guido Busca,et al.  Chemical and mechanistic aspects of the selective catalytic reduction of NOx by ammonia over oxide catalysts: A review , 1998 .

[47]  N. Yan,et al.  Novel effect of SO2 on the SCR reaction over CeO2: Mechanism and significance , 2013 .