A note on N(2)O+CO reaction mechanism over Rh surfaces



Üner, Deniz; KING, TS (Elsevier BV, 1995-09-15)
Metal dispersions of silica-supported ruthenium catalysts determined by the standard volumetric chemisorption technique were found to be inaccurate due to irreversible spillover of hydrogen to the support. Direct evidence was obtained via in situ H-1 NMR for an irreversibly bound component of the hydrogen that migrated from the metal to the support on a time scale of tens of minutes or longer at room temperature. It was also shown in this work that hydrogen saturated the surface of the metal particles on a ...
Self-sustained oscillatory behavior of NO+CH4+O-2 reaction over titania-supported Pd catalysts
OZKAN, UMIT; KUMTHEKAR, MAHESH; Karakaş, Gürkan (Elsevier BV, 1997-10-01)
Self-sustained, regular oscillations were observed in NO + CH4 + O-2 reaction over Pd/TiO2 catalysts at specific temperatures and oxygen concentrations. The oscillatory behavior was investigated combining NO reduction and methane combustion reaction studies with additional catalyst characterization experiments performed under controlled atmospheres. The catalyst was prepared using a wet impregnation technique with Pd-acetate as the precursor for palladium. A fixed-bed, flow reactor system was used to perfor...
NiMoS/gamma-Al2O3 catalysts: The nature and the aging behavior of active sites in HDN reactions
ZHANG, LEE P; Karakaş, Gürkan; OZKAN, UMIT S (Elsevier BV, 1998-09-10)
The work presented in this paper is a continuation of our earlier work aimed at acquiring a fundamental understanding of sulfided Ni-Mo/gamma-Al2O3 catalysts in HDN catalysis, A series of temperature-programmed desorption and reduction experiments were performed over in-situ sulfided bare gamma-alumina support, alumina-supported monometallic Ni, Mo, and bimetallic NiMo catalysts. The TPD and TPR results were linked to the active site assignment of Ni- and Mo-associated centers in HDN reactions. Postreaction...
On the SmCo Dimer: A Detailed Density Functional Theory Analysis
Oymak, Hueseyin; Erkoç, Şakir (American Chemical Society (ACS), 2010-02-04)
Making use of 21 different exchange-correlation functionals, we performed density functional theory calculations, within the effective core potential level, to investigate some spectroscopic and electronic features of the SmCo dimer in its ground state. A particular emphasis was placed on the (spin) multiplicity of SmCo. Most of the functionals under discussion unanimously agreed that the multiplicity of SmCo should be 10. It was observed that the nature of interaction between Sm and Co atoms to form the Sm...
Novel neutral phosphinite bridged dinuclear ruthenium(II) arene complexes and their catalytic use in transfer hydrogenation of aromatic ketones: X-ray structure of a new Schiff base, N3,N3 '-di-2-hydroxybenzylidene-[2,2 ']bipyridinyl-3,3 '-diamine
AYDEMİR, MURAT; DURAP, FEYYAZ; BAYSAL, AKIN; MERİÇ, NERMİN; Buldag, Ayseguel; Guemguem, Bahattin; Özkar, Saim; Yildirim, Leyla Tatar (Elsevier BV, 2010-07-01)
A novel Schiff base N3,N3'-di-2-hydroxybenzylidene-[2,2']bipyridinyl-3,3'-diamine, 1 was synthesized from condensation of salicylaldehyde with 3,3'-diamino-2,2'-bipyridine. Reaction of 1 with two equivalents of PPh(2)Cl in the presence of Et(3)N proceeds in toluene to give N3,N3'-di-2-(diphenylphosphino)benzylidene-[2,2']bipyridinyl-3,3'-diamine, 2 in quantitative yield. Ruthenium(II) dimers [Ru(eta(6)-arene)(mu-Cl)]Cl](2) readily react with phosphinite ligand [(Ph(2)PO)(2)-C(24)H(16)N(4)], 2 in toluene at ...
Citation Formats
D. Üner, “A note on N(2)O+CO reaction mechanism over Rh surfaces,” JOURNAL OF CATALYSIS, pp. 382–385, 1998, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/41378.