C:Corrosive;
7446-11-9Relevant academic research and scientific papers
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
Temperature Dependence of the Gas-Phase Reaction HOSO2+O2->HO2+SO3
Gleason, James F.,Howard, Carleton J.
, p. 3414 - 3417 (1988)
We have measured the temperature dependence of the reaction HOSO2+O2->HO2+SO3.This reaction is a key step in the gas-phase oxidation of SO2 to H2SO4.The rate coefficient was measured in a low-pressure discharge flow reactor, by directly monitoring the loss of HOSO2 by chemical ionization mass spectrometry.The rate coefficient is k(T)=(1.34+/-0.25)x10-12 exp cm3 molecule-1 s-1 for the temperature range 297 KT423 K.Measurements at lower temperatures were not possible because of HOSO2 loss on the reactor wall.
Thermoanalytical studies of silver and lead jarosites and their solid solutions
Frost, Ray L.,Palmer, Sara J.,Kristof, Janos,Horvath, Erzsebet
, p. 73 - 79 (2010)
Dynamic and controlled rate thermal analysis has been used to characterise synthesised jarosites of formula [M(Fe)3(SO4) 2(OH)6] where M is Pb, Ag or Pb-Ag mixtures. Thermal decomposition occurs in a series of steps. (a) dehydration, (b) well defined dehydroxylation and (c) desulphation. CRTA offers a better resolution and a more detailed interpretation of water formation processes via approaching equilibrium conditions of decomposition through the elimination of the slow transfer of heat to the sample as a controlling parameter on the process of decomposition. Constant-rate decomposition processes of water formation reveal the subtle nature of dehydration and dehydroxylation. CRTA offers a better resolution and a more detailed interpretation of the decomposition processes via approaching equilibrium conditions of decomposition through the elimination of the slow transfer of heat to the sample as a controlling parameter on the process of decomposition. Constant-rate decomposition processes of non-isothermal nature reveal separation of the dehydroxylation steps, since in these cases a higher energy (higher temperature) is needed to drive out gaseous decomposition products through a decreasing space at a constant, pre-set rate.
Degradation resistance of cordierite diesel particulate filters to diesel fuel ash deposits
Pomeroy,O'Sullivan,Hampshire,Murtagh
, p. 746 - 753 (2012)
The thermochemical degradation resistance of a typical cordierite diesel particulate filter (DPF) material by synthetic ashes typical of those arising in practice has been investigated over the temperature range 950°C-1250°C. Differential thermal analyses and heat treatment of pressed pellets were used to characterize the melting/transformation behavior of ashes representative of typical diesel fuel (ash A) and those typical of when the catalysts ferrocene (ash FeA) and cerium carboxylate (ash CeA) were present in the fuel and to study the interaction chemistry between powdered cordierite and the ash compositions. Additional experiments involved the application of surface coverings of ash to DPF specimens. The results obtained showed that filter performance would not be compromised by ash liquefaction/sintering as long as temperatures did not exceed 900°C for ash A, 970°C for ash FeA and 1100°C for ash CeA. For long time periods, compared to the expected application durations, liquid phosphates dissolve cordierite leading to the formation of Zn and Fe aluminate spinels. Overall, the results clearly indicate that thermochemical degradation of cordierite by ashes under conditions representative of typical diesel engine systems is highly unlikely at temperatures of 1100°C and below.
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.
Formation Mechanism of Condensation Nuclei in Nighttime Atmosphere and the Kinetics of the SO2-O3-NO2 System
Xie, Zhilong Diane
, p. 1543 - 1547 (1992)
An experimental study of condensation nuclei formation for the systen of SO2-O3-NO2-water vapor-zero grade air at 1 atm and room temperature has been conducted.In the experiments, nitrogen dioxide and ozone were mixed to generate NO3 and N2O5; the O3/NO2/NO3/N2O5 mixture and sulfur dioxide and water vapor were introduced into a specially designed sheath flow reaction vessel in which the oxidation of sulfur dioxide by NO3 and N2O5 occurred to produce condensation nuclei which were quantitatively determined.The results of several series of experiments accomplished at different concentrations of each of the reactants are presented.The correlations of observed concentrations of condensation nuclei to concentrations of sulfur dioxide, nitrogen dioxide, ozone, and water vapor are evaluated.A model of the mechanism of condensation nuclei formation in nighttime atmosphere is established.From the kinetic analysis of the experimental results, estimates are derived for the rate constants of the following reactions, SO2 + NO3 -> SO3 + NO2, k -21 cm3 molecule-1 s-1; and SO2 + NO2 -> SO3 + N2O4, k = 9.1 x 10-24 cm3 molecule-1 s-1, at 26.5 deg C, which are below the upper limit values reported previously.
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
Reaction of sulfur dioxide with Ni(1 0 0) and Ni(1 0 0)-p(2 × 2)-O
Alemozafar, Ali R.,Madix, Robert J.
, p. 141 - 149 (2005)
XPS, TPD, LEED and STM have been used to probe the interaction between sulfur dioxide and the Ni(1 0 0) and Ni(1 0 0)-p(2 × 2)-O surfaces. On Ni(1 0 0) at 300 K SO2 disproportionates according to 2SO2 → S(a) + SO3(a) + O(a). Sulfur and sulfite occupy sites in a p(2 × 2) arrangement, while oxygen adsorbs into c(2 × 2) domains amid Ni chains of (n√2×2√2)R45°/ (2√2×n√2)R45° (n = 7-12) periodicity that are presumed to be due to segregation of oxygen to the subsurface. On Ni(1 0 0)-p(2 × 2)-O at 300 K SO2(a) reacts with O(a) to form SO3(a). Sulfite adsorbs into p(2 × 2) islands encompassed by c(2 × 2)-O. TPD measurements with 18O are suggestive of a monodentate sulfite binding configuration.
