C:Corrosive;
7446-11-9Relevant articles and documents
A study of Lux-Flood acid-base reactions in KBr melts at 800°C
Rebrova,Cherginets,Ponomarenko
, p. 1879 - 1882 (2009)
The dissociation of CO 3 2- (pK = 2.4 ± 0.2) and precipitation of MgO (pL MgO = 10.66 ± 0.1) in a KBr melt at 800°C were studied potentiometrically with the use of a Pt(O 2)|ZrO2|(Y2O3
Whittingham, G.
, p. 550 - 550 (1946)
Whittingham, G.
, p. 141 - 150 (1948)
Hill, R. A.
, p. 107 - 112 (1924)
Synthesis and structural characterization of fluorosulfate derivatives of silver(II)
Leung,Aubke
, p. 1765 - 1772 (1978)
The synthesis of silver(II) fluorosulfate, Ag(SO3F)2, by a variety of routes is described. The preparations of a mixed-valency compound of the composition Ag3(SO3F)4 and its potassium analogue K2AgII(SO3F)4, the compounds AgIIPtIV(SO3F)6 and AgIISnIV(SO3F)6, and the complex [Ag(bpy)2](SO3F)2 are also reported. Structural studies are based on vibrational, electronic mull and diffuse reflectance, and ESR spectra as well as magnetic susceptibility measurements in the temperature range of 80 to about 300 K. Both Ag3(SO3F)4 and K2Ag(SO3F)4 show antiferromagnetic coupling. All other divalent silver compounds synthesized here are magnetically dilute with the Ag2+ ion in a square-planar or tetragonally distorted (elongated) octahedral environment.
Two Ce(SO4)2·4H2O polymorphs: Crystal structure and thermal behavior
Casari, Barbara M.,Langer, Vratislav
, p. 1616 - 1622 (2007)
Syntheses, crystal structures and thermal behavior of two polymorphic forms of Ce(SO4)2·4H2O are reported. The first modification, α-Ce(SO4)2·4H2O (I), crystallizes in the orthorhombic space group Fddd, with a=5.6587(1), b=12.0469(2), c=26.7201(3) A and Z=8. The second modification, β-Ce(SO4)2·4H2O (II), crystallizes in the orthorhombic space group Pnma, with a=14.6019(2), b=11.0546(2), c=5.6340(1) A and Z=4. In both structures, the cerium atoms have eight ligands: four water molecules and four sulfate groups. The mutual position of the ligands differs in (I) and (II), resulting in geometrical isomerism. Both these structures are built up by layers of Ce(H2O)4(SO4)2 held together by a hydrogen bonding network. The dehydration of Ce(SO4)2·4H2O is a two step (I) and one step (II) process, respectively, forming Ce(SO4)2 in both cases. During the decomposition of the anhydrous form, Ce(SO4)2, into the final product CeO2, intermediate xCeO2·yCe(SO4)2 species are formed.
Synthesis, vibrational spectra, and structure of divalent metal peroxodisulfates
Skogareva,Minaeva,Filippova
, p. 1341 - 1349 (2009)
Simple strontium peroxodisulfate SrS2O8 ? 4H2O was synthesized by the reaction of solid Sr(OH)2 ? 8H2O taken in 30% excess with an aqueous solution of (NH 4)2S2O8
Kinetics of the Reaction OH + SO2 in He, N2 and O2 at Low Pressure
Lee, Yin-Yu,Kao, Wen-Chuen,Lee, Yuan-pern
, p. 4535 - 4540 (1990)
The rate constants of the gas-phase reaction of OH with SO2 for M = He, N2,and SO2 have been determined by using the discharge flow/resonance fluorescence technique.The termonuclear rate constants (all in units of cm6 molecule -2 ss
Synthesis and Crystal Structure of Tetraphenylbismuth Benzenesulfonate Hydrate and Tetraphenylbismuth 3,4-Dimethylbenzenesulfonate
Sharutin,Egorova,Ivanenko,Sharutina,Popov
, p. 468 - 473 (2003)
The reaction of pentaphenylbismuth with SO3 or with triphenylbismuth bis(benzenesulfonate) in benzene gave tetraphenylbismuth benzenesulfonate monohydrate (I). Tetraphenylbismuth 3,4- dimethylbenzenesulfonate (II) was prepared from pentaphenylbismuth and triphenylbismuth bis(3,4-dimethylbenzenesulfonate) in benzene. The structures of compounds I and II were established by X-ray diffraction. The Bi atoms have a distorted trigonal-bipyramidal coordination where the arenesulfonate group occupies an axial position. The Bi-C(average) and Bi-O distances in molecules I and II are 2.204(2), 2.695(2) A and 2.205(2), 2.728(2) A, respectively.
Discharge Flow Measurements of the Rate Constants for the Reactions OH+SO2+He and HOSO2+O2 in Relation with the Atmospheric Oxidation of SO2
Martin, D.,Jourdain, J. L.,Bras, G. Le
, p. 4143 - 4147 (1986)
The reactions OH+SO2+M (M=He, SO2)->HOSO2 (1) and HOSO2+O2 (2) have been studied by the discharge flow EPR technique at room temperature and at pressures ranging from 1 to 6.4 Torr in a halocarbon-wax-coated reactor.For He and SO2 as the third body the bimolecular rate constant can be expressed as k1(He)=(8.1+/-0.2)*10-32+(2.4+/-0.4)*10-15 (P=1-6.4 Torr) and k1(SO2)=(1.3+/-0.4)*10-30 (P0.1 Torr).Units are cubic centimeters per molecular per second.Reaction 2 was studied by adding O2 to the reacting medium and NO for the conversion of HO2 into OH.The value of k2 was found from the computer fitting of the OH profiles with and without added O2 as a function of reaction time: k2=(3.5+/-1)*10-13 cm3 molecule-1 s-1.
A molecular approach for unraveling surface phase transitions: Sulfation of BaO as a model NOx trap
Rankovic, Nikola,Chizallet, Celine,Nicolle, Andre,Da Costa, Patrick
, p. 10511 - 10514 (2012)
SO3-induced surface reconstruction: The SO3 molecule as a multidentate ligand induces remarkable surface reconstruction phenomena on alkaline earth oxide surface. By using ab initio computations, adsorption properties are derived to elucidate the thermodynamics of the SO3-BaO system. Copyright
Williams, S.
, p. 304 - 307 (1869)
Jaffe, S.,Klein, F. S.
, p. 2150 - 2157 (1966)
Magnetic structure and properties of Cu3(OH)4SO 4 made of triple chains of spins s=1/2
Vilminot,Richard-Plouet,Andre,Swierczynski,Guillot,Bouree-Vigneron,Drillon
, p. 255 - 264 (2003)
Cu3(OH)4SO4, obtained by hydrothermal synthesis from copper sulfate and soda in aqueous medium, is isostructural with the corresponding antlerite mineral, orthorhombic, space group Pnma (62), with a=8.289(1) b=6.079(1) and c=12.057(1)A, V=607.5(2) A3, Z=4. Its crystalline structure has been refined from X-ray single crystal and powder neutron diffraction data at room temperature. It consists of copper (II) triple chains, running in the b-axis direction and connected to each other by sulfate groups. The magnetic structure, solved from powder neutron diffraction data at 1.4K below the transition at 5K evidenced by susceptibility and specific measurements, reveals that, inside a triple chain, the magnetic moments of the copper ions (μB=0.88(5) at 1.4K) belonging to outer chains are oriented along the c-axis of the nuclear cell, with ferromagnetic order inside a chain and antiferromagnetic order between the two outer chains. No long-range magnetic order is obtained along the central chain with an idle spin behavior.
Structure of vanadium oxosulfato complexes in V2O5-M2S2O7-M2 SO4 (M = K, Cs) melts. A high temperature spectroscopic study
Boghosian, Soghomon,Chrissanthopoulos, Athanassios,Fehrmann, Rasmus
, p. 49 - 56 (2002)
The VV and VIV oxosulfato Complexes formed in V2O5-M2S2O7-M2 SO4 (M = K, Cs) melts under SO2(g) or O2(g) atmosphere have been studied by electronic absorption (VIS/NIR) and Raman spectroscopy at 450 ?°C. VIS/NIR spectra have been obtained at 450 ?°C for V2O5-K2S2O7 molten mixtures in SO2 atmosphere (PSO2 = 0-1.2 atm). The data are in agreement with the VV a?? VIV equilibrium: (VO)2O(SO4)44-(l) + SO2(g) a?? 2VO(SO4)22-(l) + SO3(g). SO2 does not coordinate to the VV complex but starts significantly to coordinate to VIV for PSO2 > 0.4 atm according to VO(SO4)22-(l) + SO2(g) a?? VO(SO4)2SO22-(l). The Raman spectral features and the exploitation of the relative Raman intensities indicate that the (VO)2O(SO4)44- dimeric complex unit, possessing a V-O-V bridge, is formed in the V2O5-M2S2O7 binary mixtures. The spectral changes occurring upon interaction of the binary V2O5-K2S2O7 mixtures with SO2 or addition of M2SO4 to the binary V2O5-M2S2O7 mixtures indicate a cleavage of the V-O-V bridge and formation of the VIVO(SO4)22- or VVO2(SO4)23- monomeric complex units, respectively. The most characteristic bands due to the various complexes in the melts have been assigned. The spectral data are discussed in terms of possible structures. For the first time, high-temperature vibrational spectroscopy has been used to study the structural and vibrational properties of V2O5-K2S2O7 and V2O5-K2S2O7-K2 SO4 melts. The results are valuable for the mechanistic understanding of SO2 oxidation at the molecular level.
Bell, T. N.,Robinson, P. L.,Trenwith, A. B.
, (1955)
The local structure of SO2 and SO3 on Ni(1 1 1)
Jackson,Woodruff,Chan,Jones, Robert G.,Cowie
, p. 31 - 41 (2005)
The normal incidence X-ray standing wave (NIXSW) technique, supported by X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure (NEXAFS), has been used to determine the local adsorption geometry of SO 2 and SO3 on Ni(1 1 1). Chemical-state specific NIXSW data for coadsorbed SO3 and S, formed by the disproportionation of adsorbed SO2 after heating from 140 K to 270 K, were obtained using S 1s photoemission detection. For adsorbed SO2 at 140 K the new results confirm those of an earlier study [Jackson et al., Surf. Sci. 389 (1997) 223] that the molecule is located above hollow sites with its molecular plane parallel to the surface and the S and O atoms in off-atop sites; corrections to account for the non-dipole effects in the interpretation of the NIXSW monitored by S 1s and O 1s photoemission, not included in the earlier work, remove the need for any significant adsorption-induced distortion of the SO2 in this structure. SO3, not previously investigated, is found to occupy an off-bridge site with the C3v axis slightly tilted relative to the surface normal and with one O atom in an off-atop site and the other two O atoms roughly between bridge and hollow sites. The O atoms are approximately 0.87 ? closer to the surface than the S atom. This general bonding orientation for SO3 is similar to that found on Cu(1 1 1) and Cu(1 0 0) both experimentally and theoretically, although the detailed adsorption sites differ.
Oxidation of Sulphur Dioxide using Micro- and Nanoparticles of various Iron Oxides
Reichelt, Lydia,Hippmann, Sebastian,Brichkin, Vyacheslav Nikolayevich,Bertau, Martin
, p. 1583 - 1593 (2021)
Sulphuric acid is the chemical with highest production rates in the world. At present, it is mainly synthesized using vanadium pentoxide as catalyst, which determines the applied production process particularly in terms of gas pre-treatment and heat management. For processes, which cannot be run with vanadium pentoxide, alternative catalysts are required to make different SO2 qualities accessible to sulphuric acid production. Ferric oxides are a very promising alternative, since they combine higher thermal with improved chemical stability. Within this study, various ferric oxides were examined with regard to conversion rates and structural changes during application. Effects of crystal structure, particle size as well as thermal treatment and the influence of precipitation conditions were studied. Although conversion rates are very promising, it has become apparent, though, that these materials cannot compete with vanadium pentoxide in terms of conversion rate as well as long-time stability, yet. Nevertheless, from the results of this study, it is clear that high potential lies in focused catalyst optimisation.
Catalytic properties of the thermal decomposition products of Zr(SO4)2 · 4H2o
Kotsarenko,Shmachkova
, p. 280 - 283 (2002)
The catalytic activity of the thermal decomposition products of Zr(SO4)2 · 4H2O in the reactions of 1-butene isomerization to 2-butenes, isobutanol dehydration, and n-butane skeletal isomerization was studied. Their behavi
Synthesis and characterization of molybdenum(VI) oxide sulfates and crystal structures of two polymorphs of MoO2(SO4)
Christiansen, Alexander F.,Fjellvag, Helmer,Kjekshus, Arne,Klewe, Bernt
, p. 806 - 815 (2001)
Reactions between α-MoO3 or MoO3·0.43H2O and 65-95 wt% H2SO4 were studied from room temperature up to the boiling point of the acid. Four new compounds, MoO2(SO4), (modifications I, II and III) and MoO2(SO4)·H2SO4·H 2O, have been isolated depending on the H2SO4 concentration, reaction temperature, reaction time and molybdenum source. The characterization of these phases was performed with powder X-ray diffraction, thermogravimetric analysis, differential thermal analysis, chemical analysis and density measurements. Both starting materials react with sulfuric acid and form MoO2(SO4) II at temperatures above ca. 75 °C. This compound is unstable in the reaction mixture and converts into MoO2(SO4) I or III depending on time and temperature. The three modifications of MoO2(SO4) are hygroscopic and decomposition in moist air is studied for the I and II modifications. On heating, all modifications of MoO2(SO4) decompose into α-MoO3 or a mixture of α-MoO3 and β-MoO3 depending on heating rate and sample size. The three-dimensional, open-framework structures of I and II, have been determined from single-crystal X-ray diffraction data. I crystallizes in the monoclinic space group C2/c and II in the orthorhombic space group Pna21. Both structures are made up of MoO6 octahedra and SO4 tetrahedra and contain layers of eight- and four-membered rings of alternating, corner-sharing octahedra and tetrahedra. These layers are linked (also via Mo-S bridges) to form a three-dimensional framework. The MoO6 octahedra are rather distorted, as demonstrated by large variations in the bonding Mo-O interatomic distances, which reflect the double-bond character of the binding between molybdenum and terminal oxygen atoms pointing into the eight-membered rings. The SO4 tetrahedra are quite regular. The structural relation to MoO2(SO4) III is briefly considered.
Thermal analysis for identification of E-beam nanosize ammonium sulfate
Petkova,Pelovski,Hristova
, p. 813 - 817 (2005)
Thermal decomposition of nanosize ammonium sulfate obtained as a by-product in a new electron-beam technology cleaning up waste gases from thermal power stations was studied. DTA-TG-DTG curves were used to characterize thermal properties of the new products obtained under different technological conditions. High quality of ammonium sulfate from Merck was used as a reference material. Ammonium sulfate was the main component in all the products and their thermal behavior was similar to that of the reference. Only the solid product obtained with the highest norm of ammonia contained about 3.2% ammonium nitrate. Thermoanalytical methods can successfully be applied for control the quality of the by-products from E-beam desulfurization technology. It was found that the thermal stability of the nanosize ammonium sulfate was the same as that of the reference ammonium sulfate.
Russell, E. J.,Smith, N.
, p. 340 - 352 (1900)
James, F. C.,Kerr, J. A.,Simons, J. P.
, p. 431 - 434 (1974)
Hayek, E.,Engelbrecht, A.
, (1949)
Does Tetrahydrofuran (THF) Behave like a Solvent or a Reactant in the Photolysis of Thionyl Chloride (Cl2SO) in Cyclohexane? A Transient Infrared Difference Study
Shih, Meng-Chen,Chu, Li-Kang
, p. 5401 - 5408 (2018/06/04)
The photolysis of thionyl chloride (Cl2SO) in pure cyclohexane (cHex) and in cHex with a small amount of tetrahydrofuran (THF) irradiated with 266 nm pulsed laser was investigated using time-resolved step-scan Fourier-transform spectroscopy. The density functional theory B3LYP, with the conductor-like polarizable continuum model to account for the effects of solvents, was employed to predict the molecular parameters of the relevant species. Monitoring the wavenumbers and infrared absorbances attributed to the [S,O] species and accounting for the stoichiometry revealed SO2 to be the major oxygen-containing end product for the thermal decomposition of Cl2SO. Upon successive irradiation with 266 nm pulsed laser, the major product, as detected by IR absorption, was S2O with minor SO3, which could be generated from the secondary reactions of the photolytic intermediate ClSO. The majority of the transient vibrational features upon 266 nm irradiation of the mixture of Cl2SO/cHex was attributed to ClSO, characterized at 1155 cm-1, coupled with a minor contribution of (ClSO)2 at 1212 and 1173 cm-1. For the mixture of Cl2SO/THF/cHex, the transient population of ClSO was retained, but the amount of (ClSO)2 was slightly reduced, coupled with a new upward feature at 1054 cm-1 that was plausibly attributed to the C-O-C asymmetric stretching mode of ClSO-THF complex. Upon the successive irradiation of the Cl2SO/THF/cHex mixture, the amount of S2O was also decreased. The observed complexes of THF with solutes suggested that THF should not be merely treated as a solvent but regarded as a coordination molecule in organic synthesis. The formation of the intermediate-THF complexes altered the reaction pathways, as well as the types and populations of the end products.
