Platinum-Based Catalyst for Diesel Hydrocarbon Oxidation

Abstract The catalytic performance of Pt-based catalysts for the total oxidation of hydrocarbons was investigated. The activity of supported Pt catalysts (Pt/Al 2 O 3 , Pt/ZrO 2 , Pt/TiO 2 , and Pt/H-ZSM-5) depends on the metal oxide support. Pt/Al 2 O 3 showed the highest catalytic activity when the catalysts were aged at 750°C for 50 h in air. The activity of Pt/Al 2 O 3 was dependent on the valence state of the Pt surface. Pt/Al 2 O 3 with the Pt surface in the metallic state was more active than with the surface in the cationic state. The surface density of acid and basic sites on the Al 2 O 3 support controlled the valence state of the Pt surface and stability of the Pt particles in the highly dispersed state, respectively.

[1]  R. M. Lambert,et al.  In situ DRIFTS study of the effect of structure (CeO2–La2O3) and surface (Na) modifiers on the catalytic and surface behaviour of Pt/γ-Al2O3 catalyst under simulated exhaust conditions , 2008 .

[2]  Takashi Minami,et al.  Sintering inhibition mechanism of platinum supported on ceria-based oxide and Pt-oxide–support interaction , 2006 .

[3]  C. D. Baertsch,et al.  Spatially resolved in situ FTIR analysis of CO adsorption and reaction on Pt/SiO2 in a silicon microreactor , 2009 .

[4]  R. Herz,et al.  Transient oxidation and reduction of alumina-supported platinum , 1984 .

[5]  R. Farrauto,et al.  Monolithic diesel oxidation catalysts , 1996 .

[6]  Jinyong Luo,et al.  Sulfur release from a model Pt/Al2O3 diesel oxidation catalyst: Temperature-programmed and step-response techniques characterization , 2010 .

[7]  N. Takagi,et al.  The support effect on propane combustion over platinum catalyst: control of the oxidation-resistance of platinum by the acid strength of support materials , 2002 .

[8]  D. Rothe,et al.  Adsorption and Desorption of SO x on Diesel Oxidation Catalysts , 2009 .

[9]  J. Bueno,et al.  Surface Behavior of Alumina-Supported Pt Catalysts Modified with Cerium as Revealed by X-ray Diffraction, X-ray Photoelectron Spectroscopy, and Fourier Transform Infrared Spectroscopy of CO Adsorption , 2004 .

[10]  W. Delgass,et al.  Island Formation During Kinetic Rate Oscillations in the Oxidation of CO over Pt/SiO2: A Transient Fourier Transform Infrared Spectrometry Study , 2001 .

[11]  H. Yoshida,et al.  Effects of support and additive on oxidation state and activity of Pt catalyst in propane combustion , 2003 .

[12]  M. Twigg.  Progress and future challenges in controlling automotive exhaust gas emissions , 2007 .

[13]  M. Engelhard,et al.  Effects of reduction temperature and metal-support interactions on the catalytic activity of Pt/gamma-Al2O3 and Pt/TiO2 for the oxidation of CO in the presence and absence of H2. , 2005, The journal of physical chemistry. B.

[14]  J. Aluha,et al.  Palladium-Based Catalysts with Improved Sulphur Tolerance for Diesel-Engine Exhaust Systems , 2009 .

[15]  Riitta L. Keiski,et al.  The activity of Pt/Al2O3 diesel oxidation catalyst after sulphur and calcium treatments , 2010 .

[16]  Masatoshi Shimoda,et al.  The application of diesel oxidation catalysts to heavy duty diesel engines in Japan , 1996 .

[17]  D. Duprez,et al.  Catalytic oxidation of heavy hydrocarbons over Pt/Al2O3. Influence of the structure of the molecule on its reactivity , 2010 .

[18]  J. Lavalley,et al.  In Situ FTIR Study of the NO+CO Reaction on a Silica-Supported Platinum Catalyst at Atmospheric Pressure Using a New Pulse Technique , 2001 .