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Statements

Subject Item
n2:RIV%2F67985858%3A_____%2F06%3A00055249%21RIV07-AV0-67985858
rdf:type
n6:Vysledek skos:Concept
dcterms:description
Iron offers possibility of transformation of a reducing gas ( CO, syngas, methane etc.) into hydrogen by a cyclic process based on iron oxide reduction and release of hydrogen in the next step by steam oxidation. Thermodynamics and chemical equilibrium for reduction of magnetite by hydrogen, carbon monoxide, model syngas and methane and for oxidation of iron by steam has been studied in a temperature range 400 – 850 K. Attention was concentrated also on possible formation of undesired soot, iron carbide and iron carbonate as precursors for CO and CO2 formation in the steam oxidation step. Oxidation of iron by steam is thermodynamically favoured at temperatures 400 – 800 K enabling high hydrogen yields. Iron oxide (magnetite) reduction is the more difficult step, requiring rather higher temperature and higher CO, H2 or methane concentrations in gaseous mixtures. Iron offers possibility of transformation of a reducing gas ( CO, syngas, methane etc.) into hydrogen by a cyclic process based on iron oxide reduction and release of hydrogen in the next step by steam oxidation. Thermodynamics and chemical equilibrium for reduction of magnetite by hydrogen, carbon monoxide, model syngas and methane and for oxidation of iron by steam has been studied in a temperature range 400 – 850 K. Attention was concentrated also on possible formation of undesired soot, iron carbide and iron carbonate as precursors for CO and CO2 formation in the steam oxidation step. Oxidation of iron by steam is thermodynamically favoured at temperatures 400 – 800 K enabling high hydrogen yields. Iron oxide (magnetite) reduction is the more difficult step, requiring rather higher temperature and higher CO, H2 or methane concentrations in gaseous mixtures. V rozmezí teplot 400 – 1000 K byly studovány termodynamika a chemické rovnováhy pro redukci Cr2O3 , Mn3O4 a NiO vodíkem , CO, syntetickým plynem, metanem a pro oxidaci relevantních produktů Cr, MnO a Ni vodní parou. Pozornost byla soustředěna také na možnou tvorbu nežádoucích sazí, karbidů a uhličitanů během redukčního kroku, které vedouc následně k uvolňování CO a CO2 v oxidačním kroku. Redukce Cr2O3 a MnO na kovový chrom a mangan pomocí vodíku, CO nebo metanu je vyloučena za teplot 400 – 1000 K. Redukce Mn3O4 a NiO vodíkem, CO a CH4 za těchto nižších teplot je termodynamicky preferována.
dcterms:title
Thermodynamic Possibilities and Constraints for Pure Hydroden Production by Iron Based Chemical Looping Process at Lower Temperatures Thermodynamic Possibilities and Constraints for Pure Hydroden Production by Iron Based Chemical Looping Process at Lower Temperatures Termodynamické možnosti a omezení pro výrobu čistého vodíku pomocí železa s využitím cyklického chemického procesu za nižších teplot
skos:prefLabel
Termodynamické možnosti a omezení pro výrobu čistého vodíku pomocí železa s využitím cyklického chemického procesu za nižších teplot Thermodynamic Possibilities and Constraints for Pure Hydroden Production by Iron Based Chemical Looping Process at Lower Temperatures Thermodynamic Possibilities and Constraints for Pure Hydroden Production by Iron Based Chemical Looping Process at Lower Temperatures
skos:notation
RIV/67985858:_____/06:00055249!RIV07-AV0-67985858
n3:strany
1338;1339
n3:aktivita
n20:Z
n3:aktivity
Z(AV0Z40720504)
n3:dodaniDat
n18:2007
n3:domaciTvurceVysledku
n11:2423251
n3:druhVysledku
n14:D
n3:duvernostUdaju
n7:S
n3:entitaPredkladatele
n16:predkladatel
n3:idSjednocenehoVysledku
503789
n3:idVysledku
RIV/67985858:_____/06:00055249
n3:jazykVysledku
n17:eng
n3:klicovaSlova
iron; thermodynamics; hydrogen
n3:klicoveSlovo
n5:hydrogen n5:iron n5:thermodynamics
n3:kontrolniKodProRIV
[5D52F9F824CD]
n3:mistoKonaniAkce
Praha
n3:mistoVydani
Praha
n3:nazevZdroje
Summaries 4.
n3:obor
n13:CI
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
4
n3:rokUplatneniVysledku
n18:2006
n3:tvurceVysledku
Siewiorek, A. Rogut, J. Svoboda, Karel Slowinski, G.
n3:typAkce
n10:EUR
n3:zahajeniAkce
2006-08-27+02:00
n3:zamer
n12:AV0Z40720504
s:numberOfPages
40
n8:hasPublisher
Process Engineering Publisher
n19:isbn
80-86059-45-6