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Hydrogen from Pyrolysis Oil by Chemical Looping of a Sol–Gel‐Prepared Iron(III) Oxide on Magnesium Aluminate as Oxygen Carrier
Author(s) -
Chen Chao,
Zeng DeWang,
Qiu Yu,
Peng Song,
Zhang HuiYan,
Xiao Rui
Publication year - 2018
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201700398
Subject(s) - hydrogen , chemical looping combustion , pyrolysis , hydrogen production , coke , materials science , oxygen , chemical engineering , inorganic chemistry , steam reforming , magnesium , carbon fibers , oxide , syngas , chemistry , metallurgy , organic chemistry , composite number , engineering , composite material
Chemical looping of iron oxides has emerged as a promising approach to produce hydrogen with inherent gas separation. In this work, we use sol–gel‐prepared Fe 2 O 3 /MgAl 2 O 4 as an oxygen carrier to produce hydrogen from biomass pyrolysis oil. The results showed that 950 °C was the optimum gasification temperature to achieve a high carbon conversion and gas yield. At this temperature, we produced hydrogen by chemical looping. However, the produced hydrogen was polluted severely by CO and CO 2 because of coke formation during reduction. To solve this problem, we adjusted the reduction atmosphere by adding steam, which was an effective method to enhance the hydrogen purity. At a steam‐to‐oil ratio of 1.5, the purity of hydrogen reached 96 % in contrast to 84 % without steam. In the presence of steam, we also found a more stable porosity, which led to improved cyclic performance. Our current results demonstrate an approach to enhance hydrogen purity and material recyclability. This can be extended to improve other thermochemical hydrogen‐production processes.