Ultra low temperature CO and HC oxidation over Cu-based mixed oxides for future automotive applications

Abstract Advanced combustion technologies offer significant improvement in fuel economy as well as lower NO x engine out emissions due to the nature of low temperature combustion; however, the lower exhaust temperature has been a major concern in the removal of hydrocarbon and CO emissions under the future emission regulation. In the present study, we discovered that cerium zirconium mixed oxide containing copper (CZCu) was more active for CO and heavy HC (i.e. C 8 H 10 , and C 12 H 26 ) oxidation at below 130 °C than a platinum group metal (PGM)-based alumina catalyst under simulated diesel exhausts including NO and H 2 O. The CZCu catalyst, however, was relatively inactive for the oxidation of light HC such as C 3 H 6 . The CZCu catalyst suffered from significant deactivation upon hydrothermal aging at 750 °C, and XRD and DRIFTS suggest that the deactivation could be due to the particle size growth of CuO retarding the formation of carbonyl on Cu upon the hydrothermal treatment. However, with smart integration of CZCu catalyst into the PGM-based catalyst the hybrid catalyst system provides opportunities for cost-effective as well as better performing aftertreatment systems for advanced fuel efficient engines.

[1]  Shurong Wang,et al.  The preparation and catalytic behavior of copper–cerium oxide catalysts for low-temperature carbon monoxide oxidation , 2005 .

[2]  Y. Yao.  The oxidation of CO and hydrocarbons over noble metal catalysts , 1984 .

[3]  Jianliang Cao,et al.  Preparation, characterization and catalytic behavior of nanostructured mesoporous CuO/Ce0.8Zr0.2O2 catalysts for low-temperature CO oxidation , 2008 .

[4]  Iljeong Heo,et al.  Activity and thermal stability of Rh-based catalytic system for an advanced modern TWC , 2012 .

[5]  Neal W. Currier,et al.  Impact of different forms of feed sulfur on small-pore Cu-zeolite SCR catalyst , 2014 .

[6]  M. Pijolat,et al.  Thermal stability of Pd or Pt loaded Ce0.68Zr0.32O2 and Ce0.50Zr0.50O2 catalyst materials under oxidising conditions , 2001 .

[7]  Kangnian Fan,et al.  Highly Selective Ce–Ni–O Catalysts for Efficient Low Temperature Oxidative Dehydrogenation of Propane , 2009 .

[8]  Shurong Wang,et al.  Synthesis, characterization of CuO/Ce0.8Sn0.2O2 catalysts for low-temperature CO oxidation , 2008 .

[9]  David B. Brown,et al.  Thermal durability of Cu-CHA NH3-SCR catalysts for diesel NOx reduction , 2012 .

[10]  A. Martínez-Arias,et al.  CO-TPR-DRIFTS-MS in situ study of CuO/Ce1−xTbxO2−y (x = 0, 0.2 and 0.5) catalysts: Support effects on redox properties and CO oxidation catalysis , 2009 .

[11]  Vitaly Y. Prikhodko,et al.  Emissions from premixed charge compression ignition (PCCI) combustion and affect on emission control devices , 2010 .

[12]  C. H. Lee,et al.  Effect of Basic Additives on Pt/Al2O3 for CO and Propylene Oxidation under Oxygen-Deficient Conditions , 1997 .

[13]  Dennis N. Assanis,et al.  Comparison of HC species from diesel combustion modes and characterization of a heat-up doc formulation , 2008 .

[14]  M. Tiernan,et al.  Effects of ceria on the combustion activity and surface properties of Pt/Al2O3 catalysts , 1998 .

[15]  Sangobtip Pongstabodee,et al.  Selective oxidation of CO to CO2 over Cu–Ce–Fe–O composite-oxide catalyst in hydrogen feed stream , 2007 .

[16]  R. Hayes,et al.  Competitive no, co and hydrocarbon oxidation reactions over a diesel oxidation catalyst , 2012 .

[17]  Pradeep Kumar,et al.  Synthesis of ceria-yttria based strong Lewis acid heterogeneous catalyst: Application for chemoselective acylation and ene reaction , 2006 .

[18]  Xingyi Wang,et al.  Influence of preparation method on the performance of Mn–Ce–O catalysts , 2009 .

[19]  Iljeong Heo,et al.  The alteration of the performance of field-aged Pd-based TWCs towards CO and C3H6 oxidation , 2009 .

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

[21]  Mordecai Shelef,et al.  Twenty-five years after introduction of automotive catalysts: what next? , 2000 .

[22]  J. Vohs,et al.  An Examination of Sulfur Poisoning on Pd/Ceria Catalysts , 2002 .

[23]  Shuji Kimura,et al.  New Combustion Concept for Ultra-Clean and High-Efficiency Small DI Diesel Engines , 1999 .