Catalytic oxidation of nitrogen containing compounds for nitrogen determination

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 toward N-2, N2O and NO. The catalyst samples were also tested for model components; urea, EDTA, pyridine, glutamic acid and ammonium sulfate representing different functional groups.


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...
Microstructural, biological and mechanical investigations of hydroxyapatite-β-tricalcium phosphate composites doped with strontium and fluoride
Pourreza, Elmira; Evis, Zafer; Department of Engineering Sciences (2016)
The aim of this study was to investigate the microstructure, mechanical and biological properties of biphasic hydroxyapatite--Tricalcium phosphate (HT) and HT substituted with constant fluoride (F−) and varying strontium (Sr2+) amounts. All the samples were synthesized via precipitation method and sintered at 1100°C for 1 h. It was observed that the relative density of the sintered strontium and fluoride doped HT slightly increased. For microstructural analysis, X-ray diffraction (XRD), scanning electron m...
Free radical scavenging and antioxidative properties of 'silibin' complexes on microsomal lipid peroxidation
Basaga, H; Poli, G; Öztekin, Ceren; Aras, I (1997-03-01)
The antioxidant properties of silibin complexes, the water-soluble form silibin dihemisuccinate (SDH), and the lipid-soluble form, silibin phosphatidylcholine complex known as IdB 1016, were evaluated by studying their abilities to react with the superoxide radical anion (O-2(-)), and the hydroxyl radical (OH.). In addition, their effect on pulmonary and hepatic microsomal lipid peroxidation had been investigated. Superoxide radicals were generated by the PMS-NADH system and measured by their ability to red...
Formaldehyde Selectivity in Methanol Partial Oxidation on Silver: Effect of Reactive Oxygen Species, Surface Reconstruction, and Stability of Intermediates
Karatok, Mustafa; Şensoy, Mehmet Gökhan; Vovk, Evgeny I.; Toffoli, Hande; Toffoli, Daniele; Ozensoy, Emrah (2021-01-01)
Selective oxidation reactions on heterogeneous silver catalysts are essential for the mass production of numerous industrial commodity chemicals. However, the nature of active oxygen species in such reactions is still debated. To shed light on the role of different oxygen species, we studied the methanol oxidation reaction on Ag(111) single-crystal model catalyst surfaces containing two dissimilar types of oxygen (electrophilic, Oe and nucleophilic, On). X-ray photoelectron spectroscopy and low energy elect...
Carbon monoxide oxidation under oxidizing and reducing conditions with alkali-metal and palladium doped tin dioxide
Mirkelamoğlu, Burcu; Karakaş, Gürkan; Department of Chemical Engineering (2006)
The investigation of CO oxidation with supported noble metal catalysts to develop a fundamental understanding of the nature of the active sites, adsorbate-surface interactions, surface reaction pathways and the role of promoters is of prime importance for development of highly active and selective catalyst formulations for low temperature oxidation of carbon monoxide. Low temperature CO oxidation catalysts find applications in monitoring and elimination of CO in chemical process exhaust gases, in on-board c...
Citation Formats
G. Karakaş, “Catalytic oxidation of nitrogen containing compounds for nitrogen determination,” CATALYSIS TODAY, pp. 159–165, 2019, Accessed: 00, 2020. [Online]. Available: