Analysis of H2 and CO production via solar thermochemical reacting system of NiFe2O4 redox cycles combined with CH4 partial oxidation. (22nd March 2018)

• Record Type: Journal Article
• Authors: Guene Lougou, Bachirou; Shuai, Yong; Guohua, Zhang; Chaffa, Gédéon; Ahouannou, Clément; Tan, Heping
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 12(2018)
• Page Start: 5996
• Page End: 6010
• Publication Date: 2018-03-22
• Subjects: Nickel ferrite -- Thermal reduction -- Methane partial oxidation -- Hydrogen and syngas production -- Oxidation kinetics -- Species reactivity; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.01.197
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Thermal reduction of the partial oxidation of CH4 NiFe2 O4 followed by oxidation with H2 O and CO2 was numerically investigated for H2 and CO production. P1 radiation model was used to account for radiative heat transfer. The synergistic effect of the reactivity of Fe/Ni exhibited a very promising strategy for producing 45% of syngas with 2.54 ratios of H2 :CO at the first step and 55% of syngas with 2.34 ratios of H2 :CO at the second step. The increase in incident radiation heat flux to 437.69 kW/m 2 resulted in higher reduction kinetics of species conversion until the formation of oxygen carriers consisting of 65% of FeO, 35% of NiFe and 2.6% of carbon deposition. However, during the reduction process, the decrease in total pressure to 0.05 MPa enhanced the species reactivity and the production of H2 and CO while minimizing carbon deposition. Moreover, the oxidation temperature, operating pressure and the concentration of oxidizing species have strong impacts on the oxidation kinetics. Unlike high thermal reduction process, increasing the total pressure to 1 MPa has favorable effects on syngas production at oxidation step. Highlights: NiFe2 O4 CH4 redox cycles exhibit promising way for syngas production. The synergistic effects of oxygen carriers improve H2 and CO yield. Active order of oxygen carriers is FeO > NiO > NiFe2 O4 > NiOFe2 O3 > Fe2 O3 . The formation of FeO and Fe phase facilitate more H2 and CO production, respectively. Optimum operating conditions improving syngas yield and H2 :CO ratio was determined.