Premium
Hydrogen production via solar‐aided water splitting thermochemical cycles with nickel ferrite: Experiments and modeling
Author(s) -
Agrafiotis Christos,
Zygogianni Alexandra,
Pagkoura Chrysoula,
Kostoglou Margaritis,
Konstandopoulos Athanasios G.
Publication year - 2013
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.13882
Subject(s) - water splitting , hydrogen , redox , hydrogen production , chemistry , oxygen , yield (engineering) , thermodynamics , nickel , atmospheric temperature range , thermochemical cycle , kinetic energy , thermal , mole fraction , analytical chemistry (journal) , chemical engineering , materials science , inorganic chemistry , metallurgy , catalysis , organic chemistry , physics , photocatalysis , quantum mechanics , engineering
Water splitting — thermal reduction cyclic studies with NiFe 2 O 4 redox materials were performed in a differential fixed‐bed laboratory reactor in the temperature range 700–1,400 ° C to quantify the effects of operation temperatures and steam mole fraction on hydrogen and oxygen yields. Hydrogen yield increased drastically by an increase of the water splitting temperature from 800 to 1,000 ° C reaching a plateau at 1,100 ° C. In parallel, a simple mathematical model was formulated describing the water splitting process via the heterogeneous surface reactions of water vapor with the redox powder material, from which, in conjunction to the aforementioned experiments, the kinetic parameters of the water splitting and thermal reduction reactions were extracted. The water splitting kinetic constants exhibited weak temperature dependence between 700 and 1,100 ° C suggesting the existence on the redox material of more than one type of oxygen storage sites with respect to ease of exposure and accessibility to the gas phase. © 2012 American Institute of Chemical Engineers AIChE J, 59: 1213–1225, 2013