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7664-93-9Relevant articles and documents
Bimetallic Nanostructured Catalysts Prepared by Laser Electrodispersion: Structure and Activity in Redox Reactions
Bryzhin,Golubina,Maslakov,Lokteva,Tarkhanova,Gurevich,Yavsin,Rostovshchikova
, p. 4396 - 4405 (2020)
One-stage size-selective method of laser electrodispersion (LED) was used to produce nanostructured NiPd, NiMo and NiW coatings on the surface of alumina, HOPG and Sibunit for the catalytic application. The deposition of nanoparticles produced by LED of b
Wet plasma reactor for remidiation of SO2
Seethamsetty,Dhali,Dave, Bakul
, p. 4298 - 4300 (2001)
In pollution control applications, the presence of water in the electrical discharge enhances oxidation of pollutants. The results of an electrical discharge in gas when it flows through a heterogeneous mixture of water and dielectric pellets are reported. The discharge in the wet plasma reactor is more uniform compared to dry dielectric-barrier reactors. The electrical characteristics of such a discharge are discussed. Also the results of removal of SO2 with the wet reactor are reported. The wet reactor was found to be 5-10 times more energy efficient in removing SO2 compared to conventional dry plasma reactors.
Highly efficient photoinitiation in the cerium(III)-catalyzed aqueous autoxidation of sulfur(IV). An example of comprehensive evaluation of photoinduced chain reactions
Kerezsi, Ildiko,Lente, Gabor,Fabian, Istvan
, p. 4785 - 4793 (2005)
The photoinitiated and cerium(III)-catalyzed aqueous reaction between sulfite ion and oxygen has been studied in a diode-array spectrophotometer using the same light beam for excitation and detection. Cerium(III) is identified as the photoactive absorbing species, and the production of cerium(IV) initiates a radical chain reaction. To interpret all the experimental findings, a simple scheme is proposed, in which the additional chain carriers are sulfite ion radical (SO3-.), sulfate ion radical (SO4 -.), and peroxomonosulfate ion radical (SO5-.). The overall rate of oxidation is proportional to the square root of the light intensity per unit volume, which is readily interpreted by the second-order termination reaction of the proposed scheme. It is also shown that the reaction proceeds for an extended period of time in the dark following illumination, and a quantitative analysis is presented for this phase as well. The postulated model predicts that cerium(III) should have a cocatalytic or synergistic effect on the autoxidation of sulfite ion in the presence of other catalysts. This prediction was confirmed in the iron(III)-sulfite ion-oxygen system. The experimental method and the mathematical treatment used might be applicable to a wide range of photoinduced chain reactions.
On synthesis, structure, and thermal stability of mercury and lead sulfates and oxide sulfates
Ahmed,Fjellv?g,Kjekshus
, p. 113 - 121 (2002)
Reactions between HgO, PbO, or PbO2 and 2.5-95 wt.% H2SO4 are studied at temperatures up to the boiling point of the acid. Depending on the oxide reactant, the H2SO4 concentration, and synthesis tempe
Investigation of lead thiosulfate photolysis in aqueous solutions
Egorov
, p. 37 - 41 (2014)
A model of photolysis of PbS2O3 aqueous solutions has been proposed on the basis of identified photolysis products and semiempirical quantum-chemical calculations. The degradation of PbS2O3 starts with the dissociation of the sulfur-sulfur bond in the thiosulfate group via photochemical excitation and transition of the system a whole to the activated state, which is decomposed by the solvent. The interaction of the primary photolysis products with PbS2O3 results in the formation of final products.
Kinetics and Mechanism for the Catalytic Oxidation of Sulfur Dioxide on Carbon in Aqueous Suspensions
Brodzinsky, R.,Chang, S. G.,Markowitz, S. S.,Novakov, T.
, p. 3354 - 3358 (1980)
Combustion-produced soot (carbonaceous) particles have been found to be efficient catalysts for SO2 oxidation, especially in the presence of liquid water.A kinetic study of the catalytic oxidation of SO2 on carbon particles suspended in solution has been carried out.The reaction was found to be first order with respect to the concentration of carbon particles, 0.69th order with respect to dissolved oxygen, between zero and second order with respect to S(IV) concentrations, and independent of the pH.Temperature studies were carried out, and an activation energy for this reaction was determined.A four-step mechanism is proposed for this carbon-catalyzed oxidation reaction.
Experimental study of the heterogeneous interaction of SO3 and H2O: Formation of condensed phase molecular sulfuric acid hydrates
Couling, Suzanne B.,Sully, K. Jessica,Horn, Andrew B.
, p. 1994 - 2003 (2003)
The interaction of SO3 and H2O at low temperatures upon an inert surface has been studied with infrared spectroscopy and compared to the predictions of recent computational studies. At low temperatures and low water partial pressures, amorphous deposits of molecular H2SO4 complexed with variable amounts of H2O in a ratio of between 1:1 and 2:1 are formed. Upon annealing, this material ejects water and converts first to a 1:1 H2SO4·H2O complex and subsequently to anhydrous H2SO4. Adding water to the amorphous molecular hydrate results in the formation of a new species, which on the basis of its thermal behavior and by comparison to theoretical predictions can be attributed to a molecular polymer with a repeat unit of (H2SO4·(H2 O)2)n. Implications of these observations for the initial stages of the formation of sulfate aerosol in the atmosphere and their surface reactivity are discussed.
Rate constant of the gas phase reaction of SO3 with H2O
Wang, Xiuyan,Jin, Y. G.,Suto, Masako,Lee, L. C.,O'Neal, H. E.
, p. 4853 - 4860 (1988)
The rate constants for the reaction of S03 with H20 in He and in Nz were measured at total pressures from I-10 Torr in a flow tube at room temperature.The concentration of S03 was monitored by photofragment emission produced by 147 nm excitation.Dependencies of apparent reaction rates on wall conditions and reaction tube sizes were investigated.At total He pressures of 1-10 Torr, a value of ( 5.7 +/- 0.9 ) X 10-15 cm3/s was obtained for the upper limit of the homogeneous gas phase reaction rate constant.This rate value is more than two orders of magnitude lower than the previously published value, but it is consistent with the theoretical calculation provided in this paper.
Kinetics and Mechanism of the Oxidation of Aquated Sulfur Dioxide by Hydrogen Peroxide at Low pH
McArdie, James V.,Hoffmann, Michael R.
, p. 5425 - 5429 (1983)
A stopped-flow kinetic study of the oxidation of sulfur dioxide by hydrogen peroxide was performed over the pH range 0.0-4.5.A rate expression of the following form was verified experimentally: d/dt = k1Ka1(k2+> + k3)/-1 + k2+> + k3)(Ka1 + +>)>.The following kinetic parameters at 15 deg C were determined: k1 = (2.6 +/- 0.5)*106 M-1 s-1, k2/k-1 = 16 +/- 4 M-1, k2/k3 = (5 +/- 1)*102 (HA = acetic acid), ΔH(excit.)1 = 37 +/- 2 kJ mol-1, and ΔS(excit.)1 = 4 +/- 4 J K-1 mol-1.The reaction proceeds via a nucleophilic displacement of HSO3-1 by H2O2 to which undergoes sulfurous acid intermediate which undergoes acid-catalyzed rearrangement to form product: SO2*H2O HSO3- + H+(Ka1), H2O2 + HSO3- HOOSO2- (k1, k-1), HOOSO2- + H+ -> H+ + HSO4- (k2), HOOSO2- + HA -> HA + HSO4- (k3).Application of the above rate expression to reactions occuring in hydrometeors is discussed.
Selected-control hydrothermal synthesis of γ-MnO2 3D nanostructures
Wu, Changzheng,Xie, Yi,Wang, Dong,Yang, Jun,Li, Tanwei
, p. 13583 - 13587 (2003)
Highly uniform γ-MnO2 3D urchinlike and sisallike nanostructures have been successfully prepared by a common hydrothermal method based on the reaction between MnSO4 and KBrO3. Reaction temperature and the additives of the polymers play an important role in influencing the morphologies of the as-obtained products. These urchinlike and sisallike nanostructures, which own the highly specific area on the surface of the particles may provide more possibility to give an ideal host material for the insertion and extraction of lithium ions, to realize region-dependent surface reactivity, and to act as molecular sieves.