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Thermodynamic Possibilities and Constraints for Pure Hydroden Production by Iron Based Chemical Looping Process at Lower Temperatures

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F06%3A00055249" target="_blank" >RIV/67985858:_____/06:00055249 - isvavai.cz</a>

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    Thermodynamic Possibilities and Constraints for Pure Hydroden Production by Iron Based Chemical Looping Process at Lower Temperatures

  • Original language 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 carbideand 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.

  • Czech name

    Termodynamické možnosti a omezení pro výrobu čistého vodíku pomocí železa s využitím cyklického chemického procesu za nižších teplot

  • Czech description

    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.

Classification

  • Type

    D - Article in proceedings

  • CEP classification

    CI - Industrial chemistry and chemical engineering

  • OECD FORD branch

Result continuities

  • Project

  • Continuities

    Z - Vyzkumny zamer (s odkazem do CEZ)

Others

  • Publication year

    2006

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Article name in the collection

    Summaries 4.

  • ISBN

    80-86059-45-6

  • ISSN

  • e-ISSN

  • Number of pages

    40

  • Pages from-to

    1338-1339

  • Publisher name

    Process Engineering Publisher

  • Place of publication

    Praha

  • Event location

    Praha

  • Event date

    Aug 27, 2006

  • Type of event by nationality

    EUR - Evropská akce

  • UT code for WoS article