Chemical looping steam reforming of methane over Ce-doped perovskites

Effect of support on hydrogen generation over iron oxides in the chemical looping process

“…11 Compared with the SMR process, this technology utilizes metal oxides as redox materials to split the traditional one-step reaction into two consecutive reactions. 12,13 In a typical procedure, oxygen carrier reacts with the reducing agent to release its lattice oxygen in the fuel reactor. Aer that, the reduced oxygen carrier enters the hydrogen production reactor to react with water vapor to generate hydrogen.…”

Enhanced Resistance to Carbon Deposition over LaxCe1–xFexNi1–xO3 Oxygen Carrier for Chemical Looping Reforming

“…The intensity of CeO 2 diffraction peaks also increased with calcination temperature. In addition, two weak diffraction peaks of NiO and CeFeO 3 phases were observed on all samples. ,, The lattice parameters of the oxygen carriers, which were estimated by the Scherrer equation, are presented in Table . It was evident that all samples showed an orthorhombic structure.…”

Enhanced methane conversion using Ni-doped calcium ferrite oxygen carriers in chemical looping partial oxidation systems with CO2 utilization

“…For instance, Zhang et al have reported that partially substituting La with Ce in LaFeO 3 promotes methane conversion while also boosting the performance of water splitting during the regeneration of the reduced carrier. 18 The authors have also reported an increase in the syngas yield and CO 2 conversion (during regeneration) for the La 0.5 Ce 0.5 FeO 3 oxygen carrier due to a higher distortion of FeO 6 octahedra as compared to pure LaFeO 3 . 19 Another approach for improving oxygen carrier reactivity is the coupling of CaO and Fe 2 O 3 to form Ca 2 Fe 2 O 5 , an active metal oxide with a unique brownmillerite structure that can undergo cyclic redox reactions.…”