scholarly journals Thermochemical Decomposition of Calcium Sulfate in Presence of Carbon and Hydrogen Mix

2010 ◽  
Vol 12 (2) ◽  
pp. 139
Author(s):  
V.K. Bishimbayev ◽  
A.A. Yerubay
Keyword(s):  
Gas Phase ◽  
Thermodynamic Modeling ◽  
Calcium Sulfate ◽  
Technological Parameters ◽  
Influence Of Temperature ◽  
Extreme Character ◽  
Influence Of Temperature On ◽  
Chemical Equation ◽  
Lower Temperature ◽  
Thermochemical Decomposition

<p>Results of research of thermodynamic modeling of thermochemical decomposition of CaSO<sub>4</sub> by a mix of carbon and hydrogen are given in the article. Influence of temperature on degree of carbon interchange by hydrogen on a degree of formation in systems CaO, СаСО<sub>3</sub>, CaS was determined. Interchange of C by Н<sub>2</sub> reduces formation of СаСО<sub>3</sub>, CaS, and formation of СаО has an extreme character. With the help of method of research planning adequate equation of regression has been defined and optimum technological parameters (Т = 1660 K and 40 % degree of carbon interchange by Н<sub>2</sub>), providing full decomposition of CaSO<sub>4</sub> to СаО were determined. The composition of a gas phase of CaSO<sub>4</sub> restoration, containing 16 components was established. By reduction of pressure to 0,001 МPа it is possible to lower temperature of process to 1400 K. The chemical equation of CaSO<sub>4</sub> interaction with carbon and hydrogen was found.<em></em></p>

Influence of temperature on gas-phase photo-assisted mineralization of TCE using tubular and monolithic catalysts

1999 ◽  
Vol 54 (2-3) ◽  
pp. 369-377 ◽  
Author(s):  
Benigno Sánchez ◽  
Ana I Cardona ◽  
Manuel Romero ◽  
Pedro Avila ◽  
A Bahamonde
Keyword(s):  
Gas Phase ◽  
Influence Of Temperature ◽  
Monolithic Catalysts ◽  
Influence Of Temperature On

scholarly journals INFLUENCE OF TEMPERATURE ON THE ELEMENTS REDUCTION FROM CHROMIUM-CONTAINING ORE-LIME MELT

2019 ◽  
Vol 61 (12) ◽  
pp. 993-994
Author(s):  
O. V. Zayakin ◽  
V. A. Salina ◽  
V. I. Zhuchkov
Keyword(s):  
Thermodynamic Modeling ◽  
Reducing Agent ◽  
Reduction Degree ◽  
Influence Of Temperature ◽  
Influence Of Temperature On

Results  of  thermodynamic  modeling  of  the  elements  reduction  from  the  chromium  containing  ore-lime  melt  with  the  use  of  silicon  from ferrosiliconickel as a reducing agent are presented as a function  of temperature. It has been established that an increase in temperature  from  1300  to  2200  °C  helps  to  reduce  the  reduction  degree  of  chromium from 98,9 to 69,8 %.

scholarly journals Gas phase polymerization of ethylene with a silica-supported metallocene catalyst: influence of temperature on deactivation

1997 ◽  
Vol 18 (4) ◽  
pp. 319-324 ◽  
Author(s):  
Peter Roos ◽  
Gerben B. Meier ◽  
Job Jan C. Samson ◽  
Günter Weickert ◽  
K. Roel Westerterp
Keyword(s):  
Gas Phase ◽  
Metallocene Catalyst ◽  
Influence Of Temperature ◽  
Influence Of Temperature On ◽  
Gas Phase Polymerization

scholarly journals Statistical analysis of the influence of temperature on microstructure contact surfaces on BaTiO3-ceramics doped with Ho2O3

2014 ◽  
Vol 46 (3) ◽  
pp. 345-352 ◽  
Author(s):  
S. Jankovic ◽  
V.V. Mitic ◽  
Lj. Kocic ◽  
V. Paunovic ◽  
M. Miljkovic
Keyword(s):  
Dielectric Properties ◽  
Fractal Geometry ◽  
Quantitative Metallography ◽  
Technological Parameters ◽  
Influence Of Temperature ◽  
New Correlation ◽  
Influence Of Temperature On ◽  
Contact Surfaces ◽  
Temperature Levels ◽  
Scanning Electron

The materials based on BaTiO3 can be controlled using different technological parameters and different additives. The influence of different temperature levels of sintering (1320?C, 1350?C and 1380?C) on the size of contact area for 0.1% Ho2O3 doped BaTiO3-ceramics has been investigated. Microstructural investigations were carried out using scanning electron microscopy (JEOL-JSM 5300) equipped with EDS (QX 2000S) system. Grain size distribution was determined by quantitative metallography method. The new correlation between microstructure and dielectric properties of doped BaTiO3-ceramics based on fractal geometry and contact surface probability is recently developed. The presented results indicate that statistical model of contact surfaces is important for the prognosis of BaTiO3-ceramics microstructure and dielectric properties.

The effect of temperature on high-resolution TEM image contrast

1995 ◽  
Vol 53 ◽  
pp. 640-641
Author(s):  
T. Geipel ◽  
W. Mader ◽  
P. Pirouz
Keyword(s):  
Form Factor ◽  
Inelastic Scattering ◽  
Accurate Method ◽  
Waller Factor ◽  
Effect Of Temperature ◽  
Specimen Thickness ◽  
Influence Of Temperature ◽  
Debye Waller Factor ◽  
Influence Of Temperature On ◽  
Atomic Form Factor

Temperature affects both elastic and inelastic scattering of electrons in a crystal. The Debye-Waller factor, B, describes the influence of temperature on the elastic scattering of electrons, whereas the imaginary part of the (complex) atomic form factor, fc = fr + ifi, describes the influence of temperature on the inelastic scattering of electrons (i.e. absorption). In HRTEM simulations, two possible ways to include absorption are: (i) an approximate method in which absorption is described by a phenomenological constant, μ, i.e. fi; - μfr, with the real part of the atomic form factor, fr, obtained from Hartree-Fock calculations, (ii) a more accurate method in which the absorptive components, fi of the atomic form factor are explicitly calculated. In this contribution, the inclusion of both the Debye-Waller factor and absorption on HRTEM images of a (Oll)-oriented GaAs crystal are presented (using the EMS software.Fig. 1 shows the the amplitudes and phases of the dominant 111 beams as a function of the specimen thickness, t, for the cases when μ = 0 (i.e. no absorption, solid line) and μ = 0.1 (with absorption, dashed line).

COMPUTER MODELING OF CHEMICAL EQUILIBRIUMS IN WO3–H2O SYSTEM

2017 ◽  
pp. 35-48 ◽  
Author(s):  
V.P. Bondarenko ◽  
O.O. Matviichuk
Keyword(s):  
Transition Temperature ◽  
Gas Phase ◽  
Single Phase ◽  
Reference Data ◽  
Maximum Amount ◽  
Reaction Products ◽  
Influence Of Temperature ◽  
Equilibrium Chemical ◽  
Program Data ◽  
Good Agreement

Detail investigation of equilibrium chemical reactions in WO3–H2O system using computer program FacktSage with the aim to establish influence of temperature and quantity of water on formation of compounds of H2WO4 and WO2(OH)2 as well as concomitant them compounds, evaporation products, decomposition and dissociation, that are contained in the program data base were carried out. Calculations in the temperature range from 100 to 3000 °С were carried out. The amount moles of water added to 1 mole of WO3 was varied from 0 to 27. It is found that the obtained data by the melting and evaporation temperatures of single-phase WO3 are in good agreement with the reference data and provide additionally detailed information on the composition of the gas phase. It was shown that under heating of 1 mole single-phase WO3 up to 3000 °С the predominant oxide that exist in gaseous phase is (WO3)2. Reactions of it formation from other oxides ((WO3)3 and (WO3)4) were proposed. It was established that compound H2WO4 is stable and it is decomposed on WO3 and H2O under 121 °C. Tungsten Oxide Hydrate WO2(OH)2 first appears under 400 °С and exists up to 3000 °С. Increasing quantity of Н2О in system leads to decreasing transition temperature of WO3 into both liquid and gaseous phases. It was established that adding to 1 mole WO3 26 mole H2O maximum amount (0,9044–0,9171 mole) WO2(OH)2 under temperatures 1400–1600 °С can be obtained, wherein the melting stage of WO3 is omitted. Obtained data also allowed to state that that from 121 till 400 °С WO3–Н2O the section in the О–W–H ternary system is partially quasi-binary because under these temperatures in the system only WO3 and Н2O are present. Under higher temperatures WO3–Н2O section becomes not quasi-binary since in the reaction products WO3 with Н2O except WO3 and Н2O, there are significant amounts of WO2(OH)2, (WO3)2, (WO3)3, (WO3)4 and a small amount of atoms and other compounds. Bibl. 12, Fig. 6, Tab. 5.

The Influence of Temperature on Successful Reproductions of Burbot, Lota Lota (L.) Under Hatchery Conditions

2010 ◽  
Vol 25 (1) ◽  
pp. 93-105 ◽  
Author(s):  
Daniel Żarski ◽  
Dariusz Kucharczyk ◽  
Wojciech Sasinowski ◽  
Katarzyna Targońska ◽  
Andrzej Mamcarz
Keyword(s):  
Lota Lota ◽  
Influence Of Temperature ◽  
Influence Of Temperature On
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