Novel oxygen-carrier materials for chemical-looping combustion and chemical-looping reforming; LaxSr1─xFeyCo1─yO3─δ perovskites and mixed-metal oxides of NiO, Fe2O3 and Mn3O4
Artikel i vetenskaplig tidskrift, 2008

Solid oxygen-carrier materials for chemical-looping applications have been examined by reduction with CH4 and oxidation with air in a fixed-bed quartz reactor at 900ºC. Four perovskite materials, three metal-oxide materials and four metal-oxide mixtures have been studied. It was found that LaxSr1─xFeO3─δ perovskites provided very high selectivity towards CO/H2 and should be well suited for chemical-looping reforming. Substituting La for Sr was found to increase the oxygen capacity of these materials, but reduced the selectivity towards CO/H2 and the reactivity with CH4. La0.5Sr0.5Fe0.5Co0.5O3─δ was found to be feasible for chemical-looping combustion applications. NiO/MgAl2O4 propagated formation of solid carbon, likely due to the catalytic properties of metallic Ni. Fe2O3/MgAl2O4 had properties that made it interesting both for chemical-looping combustion and chemical-looping reforming. Adding 1% NiO particles to a bed of Fe2O3-particles increased both reactivity with CH4 and selectivity towards CO/H2 for reforming applications. Mn3O4/Mg­ZrO2 was found to be suitable for chemical-looping combustion applications, but it could not be verified that adding NiO produced any positive effects.

Hydrogen

Perovskites

Chemical-Looping Reforming

Synthesis Gas

Chemical-Looping Combustion

Partial Oxidation

Författare

Magnus Rydén

Chalmers, Energi och miljö, Energiteknik

Anders Lyngfelt

Chalmers, Energi och miljö, Energiteknik

Tobias Mattisson

Chalmers, Energi och miljö, Energiteknik

De Chen

Norges teknisk-naturvitenskapelige universitet

Anders Holmen

Norges teknisk-naturvitenskapelige universitet

Erlend Bjørgum

SINTEF Materials and Chemistry

International Journal of Greenhouse Gas Control

1750-5836 (ISSN)

Vol. 2 21-36

Ämneskategorier

Kemiska processer

Annan naturresursteknik

DOI

10.1016/S1750-5836(07)00107-7