12143-17-8Relevant articles and documents
Low-temperature thermoluminescence in solid argon: Short-range mobility of atoms
Khriachtchev, Leonid,Pettersson, Mika,Pehkonen, Susanna,Isoniemi, Esa,Raesaenen, Markku
, p. 1650 - 1657 (1999)
The 193-nm photolysis of S2 (produced from H2S2) and SO2 in solid argon and the changes introduced by annealing are monitored by using Fourier-transform infrared spectroscopy and laser-induced fluorescence. The results highlight short-range atomic mobility distinguished from global long-range mobility. It is shown that under the 193-nm irradiation a small part of S2 and SO2 molecules undergo photodecomposition yielding quasi-isolated pairs where the fragments are in close vicinity to each other. In annealing, the short-range mobility results in recombination of these pairs at rather low temperatures (a static Ar lattice support this scenario, demonstrating that the photofragments can be gently separated by a low potential barrier which favors their recombination in annealing. In particular, this quasistable configuration occurs when the two atoms occupy substitutional sites separated by the lattice parameter of 5.31 A.
Goehring, M.
, p. 42 (1944)
Steijns, M.,Koopman, P.,Nieuwenhuijse, B.,Mars, P.
, p. 96 - 106 (1976)
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Durrant, R. G.
, p. 622 - 638 (1915)
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SO2 Fluorescence from Vacuum Ultraviolet Dissociative Excitation of SO3
Suto, Masako,Ye, Chao,Ram, R. S.,Lee, L. C.
, p. 3262 - 3265 (1987)
The absorption and fluorescence excitation spectra of SO3 were measured in the 145-160-nm region with synchrotron radiation as a light source.The fluorescence spectra produced by excitation of SO3 at 147 and 157 nm were dispersed and compared with the laser-induced fluorescence spectrum of SO2, from which the emitter is identified to be the excited SO2*.The photodissociation process of SO3 is discussed in accord with the fluorescence observed.
Cook, R. L.,Winnewisser, G.,Lindsey, D. C.
, p. 276 - 284 (1973)
Bogushevich, S. E.,Makatun, V. N.,Potapovich, A. K.,Ugolev, I. I.
, (1991)
Photodissociation of the SO2*SO2+ dimer in the visible region of the spectrum: Product relative kinetic energy distributions and product angular distributions
Jarrold, Martin F.,Illies, Andreas J.,Bowers, Michael T.
, p. 1832 - 1840 (1985)
The results of an investigation of the photodissociation of the SO2*SO2+ cluster ion in the visible wavelength range (458-590 nm) are presented.The studies were performed using a crossed fast ion beam/laser beam experiment.Product relative kinetic energy distributions and product center of mass angular distributions are reported.Methods used to extract the angular distributions from the experimental measurements are described.The only ionic product observed from the photodissociation of SO2*SO2+ was SO2+.The product relative kinetic energy distributions are characteristic of statistical energy disposal.However, statistical phase space theory substantially overestimates the fraction of available energy partitioned into relative kinetic energy.The product angular distributions are discussed in terms of the asymmetry parameter β. β increases with the products relative velocity.A simple phase space theory model for β is developed for statistical dissociation with complete rotational averaging.The model accounts for the variation of β with the products relative velocity. β also varies with wavelength.The variation of β with wavelength is ascribed to changes in the lifetime of the cluster.At 458 nm the values of β indicate that complete rotational averaging has not occurred.At 590 nm the data are consistent with complete rotational averaging, implying a lifetime>5 average rotational periods.The results are interpreted in terms of a transition to a low lying bound excited state of the SO2*SO2+ cluster which arises from one of the low lying excited states of SO2+ and the ground state of SO2.
Lewis, B.
, p. 3120 - 3127 (1930)
Fajans, E.,Goodeve, C. F.
, p. 511 - 514 (1936)
Hydrolysis of aluminum sulfates in the presence of ammonium sulfite
Matveev
, p. 181 - 184 (2007)
Hydrolysis of aluminum sulfate and potash alum in the presence of an ammonium sulfite additive in the temperature range T boil-200°C was studied. A possible reaction mechanism was suggested. The composition and structure of the precipitates formed were determined and certain differences in their morphology were noted. Recommendations for practical implementation of the method of hydrolytic recovery of aluminum from solutions of its sulfate salts were given.
Analysis of the chemical processes occurring in the system PbSO4-ZnS
Malinowski, Czeslaw,Malinowska, Kazimiera,Malecki, Stanislaw
, p. 117 - 130 (1996)
Research carried out on the interactions between PbSO4 and ZnS, using mixtures with variable molar ratios of PbSO4: ZnS, showed that the process starts at 803 K. It was found that a few reactions occur at the same time, including transformation of zinc sulfide into its oxide and PbS formation; the secondary lead sulfate containing the sulfur from ZnS also appears. The PbS is derived primarily from PbSO4, and some of it contains the sulfur from ZnS.
Pickering, S.
, p. 401 - 408 (1881)
Knecht, E.
, p. 1537 - 1546 (1924)
Murthy, A. R. V.
, p. 425 - 439 (1952)
Brukl, A.,Ortner, G.
, (1930)
Dennstedt, M.,Ahrens, C.
, p. 1 - 10 (1896)
Lilienfeld, L.,White, C. E.
, p. 885 - 885 (1930)
Kay, W. E.
, p. 728 - 740 (1880)
A kinetic study of the thermal decomposition process of potassium metabisulfite: Estimation of distributed reactivity model
Jankovi?,Mentus,Jankovi?
, p. 1923 - 1933 (2008)
The thermal decomposition kinetics of potassium metabisulfite was studied by thermogravimetric (TG) and differential thermogravimetric (DTG) techniques using non-isothermal experiments. The apparent activation energy (Ea) is determined using the differential (Friedman) isoconversional method. The results of the Friedman's isoconversional analysis of the TG data suggests that the investigated decomposition process follows a single-step reaction and the observed apparent activation energy was determined as 122.4±2.1 kJ mol-1. A kinetic rate equation was derived for the decomposition process of potassium metabisulfite with contracting area model, f(α)=2(1-α)1/2, which is established using the Malek's kinetic procedure. The value of pre-exponential factor (A) is also evaluated and was found to be A=1.37×1012 min-1. By applying the Miura's procedure the distributed reactivity model (DRM) for investigated decomposition process was established. From the dependence α versus Ea, the experimental distribution curve of apparent activation energies, f(Ea), was estimated. By applying the non-linear least-squares analysis, it was found that the Gaussian distribution model (with distribution parameters E0=121.3 kJ mol-1 and σ=1.5 kJ mol-1) represents the best reactivity model for describing the investigated process. Using the Miura's method, the A values were estimated at five different heating rates and the average A values are plotted against Ea. The linear relationship between the A and Ea values was established (compensation effect). Also, it was concluded that the Ea values calculated by the Friedman's method and estimated distribution curve, f(Ea), are correct even in the case when the investigated decomposition process occurs through the single-step reaction mechanism.
Steijns, M.,Derks, F.,Verloop, A.,Mars, P.
, p. 87 - 95 (1976)
Sayce, L. A.
, (1935)
Greenwood, N. N.,Parish, R. V.,Thornton, P.
, (1965)
Bradley, J. N.,Dobson, D. C.
, p. 1555 - 1556 (1967)
Pt-core silica shell nanostructure: a robust catalyst for the highly corrosive sulfuric acid decomposition reaction in sulfur iodine cycle to produce hydrogen
Khan, Hassnain Abbas,Jung, Kwang-Deog,Ahamad, Tansir,Ubaidullah, Mohd,Imran, Muhammad,Alshehri, Saad M.
, p. 1247 - 1252 (2021)
The platinum core silica shell catalyst has facilitated stable sulfuric acid decomposition at higherature which was not possible over bare Pt nanoparticles due to sintering and agglomeration. Helium (He) gas supplies the heat (550-900 °C) in a high temperature gas cooled reactor (VHTR). The major challenge is designing a stable catalyst for the variable heat efficiency of He. Pt catalysts loaded on different supports, such as SiC, Al2O3, SiC-Al2O3, BaSO4, TiO2, SBA-15, and SiO2, have been extensively studied but they have not provided a simple method to form robust catalysts for sulfuric acid decomposition. The core-shell scheme, whereby nanoparticles are enclosed by protecting agents (CTAB) and are covered by a silica shell, delivered mesopores and exhibited higher activity and stability over testing for more than 100 h. TEM images confirmed that the Pt particles on the Pt@mSiO2 catalyst are more stable during sulfuric acid decomposition, and no significant evidence of agglomeration or sintering of the Pt core particles was found, despite some broken shells and dislocated Pt nanoparticles from the silica core. ICP-OES analysis of the spent catalysts after 100 h showed minimal Pt loss (9.0%). These types of catalysts are highly desirable for practical applications. This journal is
In Situ Modulation of A-Site Vacancies in LaMnO3.15 Perovskite for Surface Lattice Oxygen Activation and Boosted Redox Reactions
Chen, Jianjun,Ding, Yun,He, Minghua,Li, Junhua,Liu, Haiyan,Liu, Jun,Liu, Xiaoqing,Liu, Yuefeng,Mi, Jinxing,Shi, Jianqiang,Shi, Lin,Wang, Zisha,Wu, Zhong-Shuai,Xiong, Shangchao,Zhang, Qinfang
supporting information, p. 26747 - 26754 (2021/11/17)
Modulation of A-site defects is crucial to the redox reactions on ABO3 perovskites for both clean air application and electrochemical energy storage. Herein we report a scalable one-pot strategy for in situ regulation of La vacancies (VLa) in LaMnO3.15 by simply introducing urea in the traditional citrate process, and further reveal the fundamental relationship between VLa creation and surface lattice oxygen (Olatt) activation. The underlying mechanism is shortened Mn?O bonds, decreased orbital ordering, promoted MnO6 bending vibration and weakened Jahn–Teller distortion, ultimately realizing enhanced Mn-3d and O-2p orbital hybridization. The LaMnO3.15 with optimized VLa exhibits order of magnitude increase in toluene oxidation and ca. 0.05 V versus RHE (reversible hydrogen electrode) increase of half-wave potential in oxygen reduction reaction (ORR). The reported strategy can benefit the development of novel defect-meditated perovskites in both heterocatalysis and electrocatalysis.
Metal- And Base-Free C(sp2)-H Arylsulfonylation of Enamides for Synthesis of (E)-β-Amidovinyl Sulfones via the Insertion of Sulfur Dioxide
Chen, Lei,Zhou, Mi,Shen, Lin,He, Xiaochun,Li, Xiong,Zhang, Xuemei,Lian, Zhong
supporting information, p. 4991 - 4996 (2021/06/30)
A metal- and base-free C(sp2)-H direct arylsulfonylation of secondary and tertiary enamides with aryldiazonium salts and ex situ generated SO2 (from SOgen) is presented. This method runs smoothly to produce β-amidovinyl sulfones with excellent stereoselectivities in moderate to excellent yields. Moreover, this strategy features good functional group tolerance and environmentally benign reaction conditions. Mechanistic experiments indicate that this sulfonylation may proceed in a radical pathway.
