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National Repository of Grey Literature 34 records found  beginprevious33 - 34  jump to record: Search took 0.01 seconds. 
Termodynamické možnosti a omezení pro výrobu čistého vodíku pomocí chromu, manganu a niklu s využitím cyklického chemického procesu za nižších teplot
 Siewiorek, A. ; Svoboda, Karel ; Rogut, J.
Thermodynamics and chemical equilibrium for reduction of Cr2O3 , Mn3O4 and NiO by hydrogen, carbon monoxide, model syngas and methane and for oxidation of the relevant Cr, MnO and Ni by steam has been studied in a temperature range 400 – 1000 K. Attention was concentrated also on possible formation of undesired soot, carbides and carbonates during reduction step leading to CO and CO2 formation in the steam oxidation step. Reduction of Cr2O3 and MnO to metallic Cr and Mn by hydrogen, CO or CH4 at temperatures 400 – 1000 K is thermodynamically excluded. Reduction of Mn3O4 and NiO by hydrogen, CO and CH4 at such lower temperatures is thermodynamically favourable.
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Analýza elektronové struktury Lavesových fází obsahujících chrom
 Houserová, Jana ; Šob, Mojmír
Binary systems containing chromium can be found in many kinds of steels where the Laves-phase can be considered as a potential candidate for strengthening provided size and distribution of the particles are within certain limits. We performed electronic structure calculations to study the thermodynamic and structural properties of the C14 Laves phase with various compositions. In the frame of the thermodynamic study, we have evaluated the total energies of formation of Laves phase structure with different occupations of sublattices (Cr2Cr, Cr2X, X2Cr, X2X, where X stands for Fe, Mo, Si, Ta and W) with respect to the Standard Element Reference (SER) states. These energies of formation are of great importance for prediction of stability of studied configurations.
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National Repository of Grey Literature : 34 records found   beginprevious33 - 34  jump to record:
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