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Fe 2 O 3 on Ce‐, Ca‐, or Mg‐stabilized ZrO 2 as oxygen carrier for chemical‐looping combustion using NiO as additive
Author(s) -
Rydén Magnus,
Cleverstam Erik,
Johansson Marcus,
Lyngfelt Anders,
Mattisson Tobias
Publication year - 2010
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.12143
Subject(s) - chemical looping combustion , oxygen , non blocking i/o , sintering , combustion , granulation , materials science , fluidized bed , reactivity (psychology) , chemical engineering , limiting oxygen concentration , porosity , chemical reaction , redox , chemistry , analytical chemistry (journal) , nuclear chemistry , metallurgy , composite material , chromatography , organic chemistry , catalysis , medicine , alternative medicine , pathology , engineering
Oxygen‐carrier particles for chemical‐looping combustion have been manufactured by freeze granulation. The particles consisted of 60 wt % Fe 2 O 3 as active phase and 40 wt % stabilized ZrO 2 as support material. Ce, Ca, or Mg was used to stabilize the ZrO 2 . The hardness and porosity of the particles were altered by varying the sintering temperature. The oxygen carriers were examined by redox experiments in a batch fluidized‐bed reactor at 800–950°C, using CH 4 as fuel. The experiments showed good reactivity between the particles and CH 4 . NiO was used as an additive and was found to reduce the fraction of unconverted CH 4 with up to 80%. The combustion efficiency was 95.9% at best and was achieved using 57 kg oxygen carrier per MW fuel. Most produced oxygen carriers appear to have been decently stable, but using Ca as stabilizer resulting in uneven results. Further, particles sintered at high temperatures had a tendency to defluidize. © 2010 American Institute of Chemical Engineers AIChE J, 2010