Now showing items 31-40 of 48
Characterization of HDS/HDN active sites in cluster-derived and conventionally-prepared sulfide catalysts
(Elsevier, 1994-08-30)
The catalytic and sorptive properties of a series of sulfide cluster-derived catalysts were compared to those of an analogous series of conventionally-prepared sulfides. The cluster-derived and conventionally-prepared ...
The use of sulfide cluster-derived catalysts to understand the promotional effect in hydrotreatment catalysis
(John Wiley & Sons Ltd., 1992-09)
Sulfide cluster-derived ensembles are promising models of the active sites in commercial hydrotreatment catalysts. A series of sulfide clusters were adsorbed intact onto high-surface-area Γ-alumina, magnesium oxide and ...
Neopentane reactions over bimetallic Pt---Sn/AI2O3 and Pt---Au/SiO2 catalysts
(Elsevier, 1991-12)
The reaction of 2,2-dimethylpropane (neopentane) with hydrogen was studied over two series of supported bimetallic catalysts containing platinum as the primary group VIII metal and either gold or tin as the second metallic ...
Microstructure of a Pd/ceria–zirconia catalyst after high-temperature aging
(Kluwer Academic Publishers-Plenum Publishers; Kluwer Academic Publishers ; Springer Science+Business Media, 1998-03)
A model automotive exhaust catalyst, consisting of 2.25 wt% Pd supported on initially high-surface-area (88 m 2 /g) cerium–zirconium mixed oxide (Ce 0.5 Zr 0.5 O 2 ), was studied by X-ray diffraction (XRD), thermogravimetric ...
Characterization and hydrodesulfurization activity studies of unpromoted molybdenum sulfides prepared by elemental solid state reaction
(Elsevier, 1992-10)
Solid state reactions of elemental molybdenum and sulfur were used to synthesize unpromoted, model HDS catalysts. The samples studied had synthesis stoichiometries of MoS2 MoS1.95, and MoS1.975. Catalytic activity for the ...
FTIR study of bimetallic Pt-Sn/Al2O3 catalysts
(Elsevier, 1992-12)
A series of Pt-Sn/Al2O3 catalysts supported on Degussa nonporous alumina were characterized by infrared spectroscopy of adsorbed CO. The nominal platinum loading was kept constant in the catalysts at 1 wt% and the nominal ...
Chemisorption studies of promoted solid-state HDS catalysts
(Elsevier, 1992-06)
Oxygen pulse chemisorption measurements were made on a series of model HDS catalysts synthesized from solid-state reactions of elemental starting materials. Three different promoter atoms having the following catalyst ...
A chemisorption and XPS study of bimetallic Pt-Sn/Al2O3 catalysts
(Elsevier, 1991-01)
Bimetallic Pt-Sn/Al2O3 catalysts with nominally 1 wt% Pt and varying tin contents (0-3.25 wt%) prepared by coimpregnation of nonporous Degussa alumina were characterized by chemisorption of H2, O2, and CO at room temperature. ...
Chemisorption and FTIR study of bimetallic Pt---Au/SiO₂catalysts
(Elsevier, 1990-02)
Pt/SiO₂, Au/SiO₂, and bimetallic Pt---Au/SiO₂ catalysts were prepared by incipient wetness impregnation of nonporous SiO₂. The catalysts were characterized after reduction in H₂ by static volumetric chemisorption and ...