CO Oxidation over Mono and Bi-Metallic Sequentially Impregnated Pd-Pt Catalysts

2008-01-01
Kaya, Sarp
Üner, Deniz
The CO oxidation capability of sequentially impregnated Pd-Pt/gamma-Al(2)O(3) bimetallic catalysts was tested. The CO oxidation light-off curves were hierarchically spaced between monometallic Pd and monometallic Pt, which showed the highest and lowest activity, respectively, indicating that sequential impregnation did not result in the formation of bimetallic particles, but that the catalysts remained as monometallic entities over the support surface. An investigation of the effect of CO partial pressure on the reaction rates over monometallic catalysts indicated that in the presence of excess CO the surface of Pt was poisoned. On the other hand, in the presence of excess CO the reaction rates over Pd catalysts remained constant due to the availability of the subsurface oxygen pools in PdO layers.
TURKISH JOURNAL OF CHEMISTRY

Suggestions

On the Structure Sensitivity of CO Oxidation on Alumina Supported Pd-Pt Bimetallic Catalysts
Kaya, Sarp; Erunal, Ebru; Shaltaf, Riad; Ellialtıoğlu, Süleyman Şinasi; Üner, Deniz (2009-01-01)
CO oxidation reaction was studied over monometallic and bimetallic palladium-platinum catalysts at 25:75, 50:50, and 75:25 Pd:Pt atomic fractions co-impregnated over a gamma-Al2O3 support. The size of the metal particles, measured by modified hydrogen chemisorption, increased as the Pd fractions in the catalyst increased. The surface compositions and site metal distributions of the catalysts determined from Monte Carlo simulations indicated that Pd atoms segregated to the surface: at low Pd levels, Pd occup...
Electrochemical and chemical oxidation of K(C2H5OCS2),[Ni(C2H5OCS2)(2)] and [N(C2H5)(4)][Ni(C2H5OCS2)(3)]
Dag, O; Önal, Ahmet Muhtar; Isci, H (1996-06-26)
Electrochemical and chemical oxidation of (Et-Xan(-)), [Ni(Et-Xan)(2)] and [Ni(Et-Xan)(3)](-) (Et-Xan(-) = C2H5OCS2- have been studied by Cyclic Voltammetry and in situ UV-Vis spectroscopy in acetonitrile at room temperature. Cyclic Voltammograms (CV) of Et-Xan(-) and Ni(Et-Xan)(2) display one (0.00 V) and two (0.35 and 0.80 V) irreversible oxidation peaks, respectively, referenced to Ag/Ag+(0.10 M) electrode. However, CV of Ni(Et-Xan)(3)(-) displays one reversible (-0.15 V) and two irreversible (0.35, 0.80...
Poly(n-vinyl-2-pyrrolidone) stabilized nickel(0) nanoparticles as catalyst for hydrogen generation from the methanolysis of ammonia borane
Kılıçaslan, Nihan Zülay; Özkar, Salim; Department of Chemistry (2015)
This dissertion includes the preparation and characterization of poly(N-vinyl-2-pyrrolidone) stabilized nickel(0) nanoparticles, and investigation of their catalytic activity in hydrogen generation from catalytic methanolysis of ammonia-borane (AB). PVP-stabilized nickel(0) nanoparticles were prepared from the reduction of nickel(II) ethylhexanoate in the presence of PVP as stabilizer, by hydrazine borane at room temperature. PVP-stabilized nickel(0) nanoparticles were isolated from reaction medium by centr...
Improving catalytic efficiency in the methanol oxidation reaction by inserting Ru in face-centered cubic Pt nanoparticles prepared by a new surfactant, tert-octanethiol
Sen, Fatih; Goekagac, Guelsuen (2008-05-01)
PtRu/C catalysts, which have different atomic percent ratios of Pt and Ru (Pt/Ru = 0.8 (catalyst A), 2.1 (catalyst B), and 3.5 (catalyst C)), were prepared using PtCl4 and RuCl3 as starting materials and tert-octanethiol as a surfactant for the first time. Each was characterized by X-ray diffraction, transmission electron microscopy, energy dispersive analysis, X-ray photoelectron spectroscopy, cyclic voltammetry, and elemental analysis, and their activities were determined toward the methanol oxidation rea...
Catalytic oxidation of nitrogen containing compounds for nitrogen determination
Karakaş, Gürkan (2019-02-15)
The high temperature catalytic oxidation (HTCO) performance of Al2O3 supported Pt, Cu, Cu-Ce and Fe catalysts were systematically studied with a perspective of selective oxidation of nitrogenous compounds to nitric oxide for quantitative determination of bound nitrogen. The catalyst samples were prepared via impregnation and characterized by XRD and BET. In addition, temperature programmed reaction experiments with acetonitrile and oxygen were conducted to evaluate the catalytic activity and selectivity tow...
Citation Formats
S. Kaya and D. Üner, “CO Oxidation over Mono and Bi-Metallic Sequentially Impregnated Pd-Pt Catalysts,” TURKISH JOURNAL OF CHEMISTRY, pp. 645–652, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/54284.