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4876-10-2Relevant academic research and scientific papers
Influence of Oxidation of Pd/Al2O3 for the Reactions of CO with NH3 and Formamide Decomposition
Paul, D. K.,Worley, S. D.
, p. 8956 - 8959 (1990)
The reaction of CO with NH3 and the decomposition reactions for HNCO and formamide over Pd/Al2O3 films have been investigated by infrared spectroscopy.The formation of isocyanate species (NCO) was observed during all of these reactions over preoxidized Pd/Al2O3, but not over prereduced surfaces.These NCO species were formed Pd but spilled over to the Al2O3 support.Palladium became reduced during the course of the reaction of CO with NH3.A mechanism is proposed in which the reduction of Pdδ+ and the formation of a Pd formamide species are key features.
Synthesis, application and AIE properties of novel fluorescent tetraoxocalix[2]arene[2]triazine: The detection of a hazardous anion, cyanate
Bozkurt, Selahattin,Halay, Erkan
, (2020)
A highly effective, new heterocalixarene fluorescent receptor comprised of 2-(2-aminophenyl)benzothiazole and tetraoxacalix[2]arene[2]triazine was designed and synthesized by one-step reaction. The sensor candidate exhibiting aggregation induced emission (AIE) was tested for its photophysical behaviour towards detection of various anions. The results showed that our receptor undergo AIE in >40% H2O-DMSO along with large pseudo Stokes shift (Δλ = 219 nm) and exhibit selective and sensitive detection towards hazardous cyanide's oxidation product, cyanate (CNO-) ion over other tested anions. The blue-shifted fluorescence emission (λem = 492 nm) enhancement with large Stokes shift (Δλ = 144 nm) was observed with the increase in cyanate concentration. The synthesized turn-on sensor towards cyanate detection could be applied in real sample analyses as an improvement to the method currently carried out by international standards and hereby a different approach has been made for the detection of cyanide through its oxidation form, cyanate.
Infrared spectrum of solid isocyanic acid (HNCO): Vibrational assignments and integrated band intensities
Lowenthal,Khanna,Moore, Marla H.
, p. 73 - 78 (2002)
Characterization of infrared spectra thin films of solid HNCO condensed from the gas phase was reported. It was characterized in terms of integrated band intensities, vibrational frequencies and mode assignments. Reaction of Isocyanic acid with water (Hs
Thermal properties of cyanatocopper(II) complexes with pyridine, bipyridine and phenanthroline
Kabesova,Jorik
, p. 1705 - 1713 (1996)
The thermal properties of cyanatocopper complexes with pyridine, bipyridine and phenanthroline are described in this paper. It was found that the thermal stabilities of the complexes were found to increase in the order py?bipy2(NCS)2 (L=pyridine and its methyl derivates) which are composed of the liberation of ligands L and redox reactions of thiocyanate ligands with the central Cu(II) atom [1,2]. The decomposition temperature of thiocyanate ligands depends on the properties of the ligands L present in the coordination sphere. An analogous course of thermal decomposition was also observed for [Cu(bipy)2(NCX)](NCX) (X=S or Se) [3]. For the phenanthroline complexes [Cu(phen)2(NCX)2] (X=S or Se) the thermal stability was found to increase significantly (by about 140°C) and the decomposition stoichiometry was also changed [3]. The present paper contains the results of thermoanalytical studies on bipyridine and phenanthroline cyanatocopper complexes, and a comparison of the thermal properties of pyridine cyanato and isothiocyanatocopper complexes.
Infrared Study of Ammonia-Carbon Monoxide Reaction on Silica-supported Iron Catalysts
Johnson, Colin,Jorgensen, Norman,Rochester, Colin H.
, (1988)
Infrared spectroscopy has been used to study the reaction of carbon monoxide and ammonia over Fe/SiO2 catalyst at ca. 298-723 K.Adatoms of nitrogen resulting from the dissociative adsorption of ammonia reacted with CO to form surface isocyanate on iron at
Furier Transform Infrared Studies of the Irreversible Oxidation of Cyanide at Platinum Electrodes
Hinman, A. Scott,Kydd, Ronald A.,Cooney, Ralph P.
, p. 3525 - 3534 (1986)
The behaviour of cyanide on platinum electrodes at anodic potentials has been studied by voltammetric and Furier transform infrared reflectance spectroscopic techniques.The voltammetry shows that cyanide adsorbs on platinum at potential more negative than -0.8 V (SCE).Potential-sensitive infrared absorptions appearing between 2200 and 2250 cm-1 are tentatively assigned to strongly adsorbed cyanide species.Another band at 2074.5 cm-1 shows no change in wavenumber with potential and is thought to be associated with cyanide in the double-layer region.An absorption at 2169 cm-1, which appears with significant intensity at anodic potentials, has been attributed to bulk cyanate.Other features at 2093 and 2343 cm-1 are assigned to aqueous hydrogen cyanide and carbon dioxide, respectively, possibly formed as a result of changes in interfacial pH associated with electro-oxidation.
FORMATION OF ISOCYANATES ON NOBLE METALS AND SUPPORTED NOBLE METAL CATALYSTS.
Schuth,Wicke
, p. 813 - 819 (1988)
The formation of support-NCO and noble metal-NCO groups on oxide supported noble metal catalysts and high area evaporated metal films during the NO/CO reaction was studied by FTIR spectroscopy. With SiO//2 and Al//2O//3 as supports the results reported in the literature were essentially reproduced. With TiO//2 and ZrO//2 absorption bands in the region between 2000 and 2100 cm** minus **1 were detected, which had not been described before. On evaporated metals NCO-groups could be detected in situ. They are located at 2185 cm** minus **1 for Pd and at 2170 cm** minus **1 for Pt. Based on kinetic measurements the spillover of NCO-groups from the noble metal to the support is proposed as a mechanism for support-NCO formation.
A Multifunctional Bimetallic Molecular Device for Ultrasensitive Detection, Naked-Eye Recognition, and Elimination of Cyanide Ions
Chow, Cheuk-Fai,Ho, Pui-Yu,Wong, Wing-Leung,Gong, Cheng-Bin
, p. 12984 - 12990 (2015)
A new bimetallic FeII-CuII complex was synthesized, characterized, and applied as a selective and sensitive sensor for cyanide detection in water. This complex is the first multifunctional device that can simultaneously detect cyanide ions in real water samples, amplify the colorimetric signal upon detection for naked-eye recognition at the parts-per-million (ppb) level, and convert the toxic cyanide ion into the much safer cyanate ion in situ. The mechanism of the bimetallic complex for high-selectivity recognition and signaling toward cyanide ions was investigated through a series of binding kinetics of the complex with different analytes, including CN-, SO42-, HCO3-, HPO42-, N3-, CH3COO-, NCS-, NO3-, and Cl- ions. In addition, the use of the indicator/catalyst displacement assay (ICDA) is demonstrated in the present system in which one metal center acts as a receptor and inhibitor and is bridged to another metal center that is responsible for signal transduction and catalysis, thus showing a versatile approach to the design of new multifunctional devices.
Photocatalytic Oxidation of Cyanide on Platinized TiO2
Kogo, Katsuyuki,Yoneyama, Hiroshi,Tamura, Hideo
, p. 1705 - 1710 (1980)
The photocatalytic oxidation of cyanide on platinized TiO2 was studied mainly from the standpoint of semiconductor electrochemistry to elucidate the role of platinum deposited on TiO2 photocatalysts.It was found that platinization enhances the rate of the oxygen reduction which constitutes a partial process of the photocatalytic reaction, but suppresses the rate of photosensitized oxidation as the counter partial process in which cyanide is oxidized competitively with water.The activities of single crystal and powder TiO2 catalysts for photocatalytic reaction were compared for cases with and without 50 monolayers of Pt.They were found comparable in spite of a large surface area of the latter, suggesting that the number of photons striking the catalyst surface entirely controls the rate of photocatalytic reaction.Effects of platinization on the electrochemical properties of TiO2, evaluation of the rate of photocatalytic reaction by electrochemical analyses, and effects of illumination on the photocatalytic process are discussed.
Photocatalytic oxidation of cyanide: Kinetic and mechanistic studies
Chiang,Amal,Tran
, p. 285 - 297 (2003)
The kinetics and mechanism of the photocatalytic oxidation of cyanide in the presence titanium dioxide catalyst were investigated in this study. By displacing the surface hydroxyl groups on the surface of titanium dioxide with fluoride ions, it was deduced that cyanide is oxidised via a pure heterogeneous pathway, i.e. oxidised by the holes trapped at the surface hydroxyl groups ≡TiO.. The quantum efficiency of the photocatalytic oxidation was found to be low (ca. 0.1-0.2%) and this was mainly due to (1) the low adsorption of cyanide ions onto the titanium dioxide surface, (2) the absence of homogenous reaction between cyanide ions and diffused hydroxyl radicals, and (3) the high electron hole recombination rate within the titanium dioxide photocatalyst. A kinetic model was developed to describe the mechanism involved in the photocatalytic oxidation of cyanide.
