The Experts below are selected from a list of 216 Experts worldwide ranked by ideXlab platform
Eli Korin - One of the best experts on this subject based on the ideXlab platform.
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the molar enthalpies of solution and vapour pressures of saturated aqueous solutions of some ammonium salts
The Journal of Chemical Thermodynamics, 2003Co-Authors: Alexander Apelblat, Eli KorinAbstract:Abstract Vapour pressures of water over saturated solutions of Cesium chloride, Cesium bromide, Cesium nitrate, Cesium sulfate, Cesium formate, and Cesium oxalate were determined as a function of temperature. These vapour pressures were used to evaluate the water activities, osmotic coefficients and molar enthalpies of vapourization. Molar enthalpies of solution of Cesium chloride, ΔsolHm(T = 295.73 K; m = 0.0622 mol · kg−1) = (17.83 ± 0.50) kJ · mol−1; Cesium bromide, ΔsolHm(T = 293.99 K; m = 0.0238 mol · kg−1) = (26.91 ± 0.59) kJ · mol−1; Cesium nitrate, ΔsolHm(T = 294.68 K; m = 0.0258 mol · kg−1) = (37.1 ± 2.3) kJ · mol−1; Cesium sulfate, ΔsolHm(T = 296.43 K; m = 0.0284 mol · kg−1) = (16.94 ± 0.43) kJ · mol−1; Cesium formate, ΔsolHm(T = 295.64 K; m = 0.0283 mol · kg−1) = (11.10 ± 0.26) kJ · mol−1 and ΔsolHm(T = 292.64 K; m = 0.0577 mol · kg−1) = (11.56 ± 0.56) kJ · mol−1; and Cesium oxalate, ΔsolHm(T = 291.34 K; m = 0.0143 mol · kg−1) = (22.07 ± 0.16) kJ · mol−1 were determined calorimetrically. The purity of the chemicals was generally greater than 0.99 mass fraction, except for HCOOCs and (COOCs)2 where purities were approximately 0.95 and 0.97 mass fraction, respectively. The uncertainties are one standard deviations.
Chunshan Song - One of the best experts on this subject based on the ideXlab platform.
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effects of Cesium ions and Cesium oxide in side chain alkylation of toluene with methanol over Cesium modified zeolite x
Industrial & Engineering Chemistry Research, 2016Co-Authors: Fanshu Ding, Yiren Wang, Chunshan SongAbstract:The side-chain alkylation of toluene with methanol was studied on Cesium-modified zeolite X prepared by ion-exchange and impregnation with different Cesium precursors. The catalyst was characterized by X-ray diffraction, scanning electron microscopy, X-ray fluorescence spectroscopy, Ar physical adsorption–desorption, NH3 temperature-programmed desorption (TPD), CO2-TPD, thermogravimetric/differential thermal analysis, ultraviolet-Raman spectroscopy, energy-dispersive spectrometry, and X-ray photoelectron spectroscopy. Cesium hydroxide was found to be the most effective precursor for modifying zeolite X. Cesium ions bonded on the framework and Cesium oxide formed in the pore were found to take different roles in this reaction. Cesium ions could adsorb and activate toluene or modify the basicity of framework oxygen, whereas Cesium oxide could ensure the effective conversion of methanol to formaldehyde and inhibit the process of coke deposition. A possible reaction pathway for this reaction over Cesium-modif...
Laura Torrentemurciano - One of the best experts on this subject based on the ideXlab platform.
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in situ h2 production via low temperature decomposition of ammonia insights into the role of Cesium as a promoter
International Journal of Hydrogen Energy, 2014Co-Authors: Alfred K Hill, Laura TorrentemurcianoAbstract:Cesium-promoted ruthenium nanoparticles supported on multi-walled carbon nanotubes catalysts are shown to be highly active for hydrogen production by ammonia decomposition. Its low temperature activity is significantly improved as the Cesium loading increases, reducing the activation energy from 96.7 kJ/mol in the absence of Cesium to 59.3 kJ/mol with a Cesium/ruthenium molar ratio of 3. Hydrogen production was observed to proceed below 590 K which represents a breakthrough towards the use of ammonia as chemical storage for in-situ hydrogen production on fuel cells. The catalytic enhancement is shown to be due to the electronic modification of ruthenium by the electron donating Cesium promoter located on the ruthenium surface and in close proximity on the CNT surface. However, higher promoter loadings above a Cesium/ruthenium ratio of 3 leads to ammonia inaccessibility to the catalytic active sites.
V. P. Korobov - One of the best experts on this subject based on the ideXlab platform.
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Efficient Uptake of Cesium Ions by Rhodococcus Cells
Microbiology, 2002Co-Authors: Irena B. Ivshina, Tanya A. Peshkur, V. P. KorobovAbstract:Bacteria of the genus Rhodococcus were found to be able to accumulate Cesium by means of active transport and nonspecific sorption on the cell surface structures. The maximum removal (up to 97%) of Cesium from a medium supplemented with ammonium acetate was observed at 28°C, pH 7.8–8.6, and an equimolar content (0.2 mM) of potassium and Cesium ions in the medium. The most active Cesium-accumulating rhodococcal strains may be useful in biological treatment of industrial wastewaters contaminated with radionuclides.
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The efficient accumulation of Cesium ions by Rhodococcus cells
Microbiology, 2002Co-Authors: Irena B. Ivshina, Tanya A. Peshkur, V. P. KorobovAbstract:: Bacteria of the genus Rhodococcus were found to be able to accumulate Cesium by means of active transport and nonspecific sorption on the cell surface structures. The maximum removal (up to 97%) of Cesium from a medium with ammonium acetate was observed at 28 degrees C, pH 7.8-8.6, and an equimolar content (0.2 mM) of potassium and Cesium ions in the medium. The most active Cesium-accumulating Rhodococcus sp. strains can be used for purification of industrial wastewaters contaminated with radionuclides.
Ned S Rasor - One of the best experts on this subject based on the ideXlab platform.
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Cesium vapor thermionic converter anomalies arising from negative ion emission
Journal of Applied Physics, 2016Co-Authors: Ned S RasorAbstract:Compelling experimental evidence is given that a longstanding limit encountered on Cesium vapor thermionic energy converter performance improvement and other anomalies arise from thermionic emission of Cesium negative ions. It is shown that the energy that characterizes thermionic emission of Cesium negative ions is 1.38 eV and, understandably, is not the electron affinity 0.47 eV determined for the photodetachment threshold of the Cesium negative ion. The experimental evidence includes measurements of collector work functions and volt-ampere characteristics in quasi-vacuum Cesium vapor thermionic diodes, along with reinterpretation of the classic Taylor-Langmuir S-curve data on electron emission in Cesium vapor. The quantitative effects of negative ion emission on performance in the ignited, unignited, and quasi-vacuum modes of Cesium vapor thermionic converter operation are estimated.