Partial oxidation of methane over Pt–Ru bimetallic catalyst for syngas production

Abstract A bimetallic catalyst (Pt–Ru 50/50) has been prepared for methane partial oxidation. Total metal load was 1 wt%. The support was alumina mixed with 25 wt% of a ceria–zirconia mixture. This because of the good performances of alumina for such applications and to exploit the oxygen buffer effect of the ceria–zirconia system. The catalyst has been prepared by incipient wetness and characterized by means of XRD, BET surface area, TPR/TPO and SEM–EDS analyses. It showed good activity and high selectivity towards CO and H 2 , produced in a ratio suitable for Fisher–Tropsch applications. The effect of spatial velocity (GHSV) has been investigated; ramping temperature up and down, some hysteresis has been evidenced, especially at the highest GHSV, mainly caused by thermal effects. Overall, 100% conversion of methane to H 2 and CO at the appropriate syngas ratio (2/1) can achieved easily and with stability.

[1]  T. Gardner,et al.  Catalytic partial oxidation of methane over Pt/ceria-doped catalysts: Effect of ionic conductivity , 2006 .

[2]  W. Stickle,et al.  Handbook of X-Ray Photoelectron Spectroscopy , 1992 .

[3]  L. Basini,et al.  Molecular mechanisms in partial oxidation of methane on Ir/α-Al2O3: reactivity dependence on catalyst properties and transport phenomena limitations , 1996 .

[4]  Min-Woong Ryoo,et al.  Catalytic combustion of methane over supported bimetallic Pd catalysts: Effects of Ru or Rh addition , 1999 .

[5]  E. Ruckenstein,et al.  Effect of Support on Partial Oxidation of Methane to Synthesis Gas over Supported Rhodium Catalysts , 1999 .

[6]  George R. Gavalas,et al.  Methane partial oxidation on Pt/CeO2 and Pt/Al2O3 catalysts , 2002 .

[7]  Jianyi Lin,et al.  Thermal processes of volatile RuO2 in nanocrystalline Al2O3 matrixes involving γ→α phase transformation , 2001 .

[8]  J. Kašpar,et al.  A Temperature-Programmed and Transient Kinetic Study of CO2Activation and Methanation over CeO2Supported Noble Metals , 1997 .

[9]  R. K. Toghiani,et al.  Partial oxidation of methane to H2 and CO over Rh/SiO2 and Ru/SiO2 catalysts , 2004 .

[10]  M. Baerns,et al.  Rhodium-catalyzed partial oxidation of methane to CO and H2. In situ DRIFTS studies on surface intermediates , 1994 .

[11]  Chunshan Song,et al.  Fuel processing for low-temperature and high-temperature fuel cells , 2002 .

[12]  Y. Matsumura,et al.  Oxidative methane conversion to carbon monoxide and hydrogen at low reactor wall temperatures over ruthenium supported on silica , 1994 .

[13]  Stefano Cavallaro,et al.  Hydrogen production from methane through catalytic partial oxidation reactions , 2000 .

[14]  M. Boaro,et al.  Insights into the dynamics of oxygen storage/release phenomena in model ceria–zirconia catalysts as inferred from transient studies using H2, CO and soot as reductants , 2006 .

[15]  Jens R. Rostrup-Nielsen,et al.  Syngas in perspective , 2002 .

[16]  J. Ying,et al.  Reverse microemulsion-mediated synthesis and structural evolution of barium hexaaluminate nanoparticles , 2000 .

[17]  S. Järås,et al.  Catalytic combustion of methane over bimetallic Pd–Pt catalysts: The influence of support materials , 2006 .

[18]  Sven Järås,et al.  Microemulsion-prepared ruthenium catalyst for syngas production via methane partial oxidation , 2008 .

[19]  J. Fierro,et al.  Influence of molar ratio on Pd–Pt catalysts for methane combustion , 2006 .

[20]  P. Canu,et al.  Partial oxidation of methane over supported ruthenium catalysts , 2007 .

[21]  Rufino M. Navarro,et al.  Production of hydrogen by oxidative reforming of ethanol over Pt catalysts supported on Al2O3 modified with Ce and La , 2005 .

[22]  M. S. Hegde,et al.  A comparative study of Pt/CeO2 catalysts for catalytic partial oxidation of methane to syngas for application in fuel cell electric vehicles , 2003 .

[23]  S. Ordóñez,et al.  Influence of catalyst treatments on the adsorption properties of γ-Al2O3 supported Pt, Rh and Ru catalysts , 2005 .

[24]  P. Battle,et al.  Partial oxidation of natural gas to synthesis gas over ruthenium perovskite oxides , 1994 .

[25]  P. Cheekatamarla,et al.  Catalytic autothermal reforming of diesel fuel for hydrogen generation in fuel cells: II. Catalyst poisoning and characterization studies , 2006 .

[26]  A. Jonas,et al.  Staining of poly(ethylene terephthalate) by ruthenium tetroxide , 2003 .

[27]  G. Frenking,et al.  Why are olefins oxidized by RuO4 under cleavage of the carbon-carbon bond whereas oxidation by OsO4 yields cis-diols? , 2004, Journal of the American Chemical Society.