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  1. No Access

    Article

    Synthesis of α- and β-FeOOH iron oxide nanoparticles in non-ionic surfactant medium

    Forced hydrolysis of Fe(III) ions in acidic media was performed under controlled synthetic conditions to produce α- and β-FeOOH iron oxides. The forced hydrolysis synthesis was carried out, separately, in an a...

    S. Bashir, R. W. McCabe, C. Boxall, M. S. Leaver… in Journal of Nanoparticle Research (2009)

  2. No Access

    Article

    Effect of alloy composition on dispersion stability and catalytic activity for NO oxidation over alumina-supported Pt–Pd catalysts

    Applying a synthesis procedure that promotes alloy formation, highly-dispersed alumina-supported Pt–Pd catalysts spanning the Pt-rich half of the composition range were prepared, aged under oxygen-rich hydroth...

    G. W. Graham, H.-W. Jen, O. Ezekoye, R. J. Kudla, W. Chun, X. Q. Pan… in Catalysis Letters (2007)

  3. No Access

    Article

    Reducibility of Catalyzed Cerium–Praseodymium Mixed Oxides

    Cerium–praseodymium mixed oxides covering a wide range of cerium/praseodymium ratios were synthesized, loaded with 2 wt% palladium, and characterized by X-ray diffraction and temperature-programmed reduction. ...

    W. Chun, G. W. Graham, J. A. Lupescu, R. W. McCabe, M. M. Koranne… in Catalysis Letters (2006)

  4. No Access

    Article

    Coarsening of Pt Particles in a Model NO x Trap

    The effects of temperature and atmosphere on the coarsening of Pt particles in a model NO x trap (Pt/BaO/Al2O3) were examined by XRD, TEM, and CO chemisorption. The main finding...

    G.W. Graham, H.-W. Jen, W. Chun, H.P. Sun, X.Q. Pan, R.W. McCabe in Catalysis Letters (2004)

  5. No Access

    Article

    Leaching of Ba2+ in NOx Traps

    It has been found that crystalline BaCO3 replaces crystalline BaAl2O4 in prototypical NO x traps upon exposure to liquid water. This phenomenon can be understood in terms of aci...

    G.W. Graham, H.-W. Jen, J.R. Theis, R.W. McCabe in Catalysis Letters (2004)

  6. No Access

    Article

    Aging-Induced Metal Redistribution in Bimetallic Catalysts

    Alloy particles were detected by XRD in bimetallic catalysts, made from physical mixtures of powders comprising distinct metal-support combinations (e.g., Pd on alumina and Rh on ceria-zirconia), following hig...

    G.W. Graham, H. Sun, H.-W. Jen, X.Q. Pan, R.W. McCabe in Catalysis Letters (2002)

  7. No Access

    Article

    Characterization of model automotive exhaust catalysts: Pd on Zr‐rich ceria–zirconia supports

    Model Pd automotive three‐way catalysts were prepared with high‐surface‐area Zr‐rich ceria–zirconia powders as support materials, aged for 12 h at 1050°C under redox conditions simulating automotive exhaust ga...

    G.W. Graham, H.‐W. Jen, R.W. McCabe, A.M. Straccia, L.P. Haack in Catalysis Letters (2000)

  8. No Access

    Chapter

    The Use of Clays as Sorbents and Catalysts

    This paper attempts to show how the structural, physical and chemical properties of clay minerals relate to their laboratory, industrial and environmental uses as sorbents and catalysts. A brief review of the ...

    M. Caine, G. Dyer, J. V. Holder… in Natural Microporous Materials in Environme… (1999)

  9. No Access

    Article

    Microstructure of a Pd/ceria–zirconia catalyst after high-temperature aging

    A model automotive exhaust catalyst, consisting of 2.25 wt% Pd supported on initially high-surface-area (88 m2/g) cerium–zirconium mixed oxide (Ce0.5Zr0.5O2), was studied by X-ray diffraction (XRD), thermogravime...

    J.C. Jiang, X.Q. Pan, G.W. Graham, R.W. McCabe, J. Schwank in Catalysis Letters (1998)

  10. No Access

    Article

    Sol-Gel Precursors and the Oxygen Storage Capacity of PrOy-ZrO2 Materials

    The gels derived from mixtures of Pr(OiC3H7)3 and Zr(OiC3H7)4⋅iC3H7OH, upon hydrolysis and pyrolysis, furnish single-phase PrOy-ZrO2 materials crystallized in the fluorite structure. These materials can be coated...

    C. K. Narula, K. L. Taylor, L. P. Haack, L. F. Allard… in MRS Online Proceedings Library (1997)

  11. No Access

    Article

    Encapsulation of Pd particles by ceria-zirconia mixed oxides

    Redox aging above 1000°C of initially high-surface-area (of order 100 m2/g) cerium-rich ceria-zirconia mixed oxides containing a few wt% Pd results in the loss of most of the surface area and concomitant encapsul...

    G.W. Graham, H.-W. Jen, W. Chun, R.W. McCabe in Catalysis Letters (1997)

  12. No Access

    Article

    Incorporation of La3+ into a Pt/CeO2/Al2O3 catalyst

    The effects of La3+ incorporation into a Pt/CeO2/Al2O3 catalyst were investigated by a combination of activity, temperature-programmed reduction (TPR), oxygen storage capacity (OSC), noble-metal surface area, and...

    R. K. Usmen, G. W. Graham, W. L. H. Watkins, R. W. McCabe in Catalysis Letters (1994)

  13. No Access

    Article

    Investigation of La3+-modified Al2O3supported CeO2

    X-ray photoelectron spectroscopy measurements indicate that the Ce3+ fraction in Al2O3-supported CeO2 can be decreased by the incorporation of La3+. If La3+ is incorporated into the Al2O3 before CeO2 is added, a ...

    G. W. Graham, P. J. Schmitz, R. K. Usmen, R. W. McCabe in Catalysis Letters (1993)

  14. No Access

    Article

    Methyl t-Butyl Ether (MTBE) Production: A Comparison of Montmorillonite-Derived Catalysts with an Ion-Exchange Resin

    Montmorillonite-based catalysts were compared with an acidic ion-exchange resin of the type used industrially for the production of methyl t-butyl ether (MTBE) from methanol and isobutene or t-butanol. When 1,...

    J. M. Adams, K. Martin, R. W. McCabe, S. Murray in Clays and Clay Minerals (1986)