Kinetic decomposition of La0.3Sr0.7CoO3−δ perovskite membranes during oxygen permeation

Hydrogen amplification of coke oven gas by reforming of methane in a ceramic membrane reactor

“…The composition changes of the cross sections near the air side and near the permeation side confirmed that the loose structure run deeper into the bulk of the membrane on both sides. The kinetic demixing and kinetic decomposition of oxygen-permeable membranes have been reported by many researchers [22][23][24][25]. For instance, the change of structure was found up to several microns for BaCe 0.15 Fe 0.85 O 3Àd after 160 h under syngas production [22], and the thickness of the loose layer was about 60 mm for Ba 0.5 Co 0.5 Fe 0.2 Co 0.8 O 3Àd after 100 h operation under a CH 4 environment [23].…”

Unsteady-state permeation and surface exchange of dual-phase membranes

“…Therefore, we think the unsteady permeation of the one side or both side naked dualphase membranes is related to the morphology changes. Other researchers observed morphological changes after oxygen permeation experiments on perovskite membranes [32]. It is clear that the unsteady period of oxygen permeation relates to oxygen exchange reactions on gas-solid interface of membranes.…”

Partial oxidation of methane to syngas in BaCe0.15Fe0.85O3−δ membrane reactors

“…It is the gradient that accelerates the kinetic decomposition of the materials. van Doorn et al [24] reported a kinetic decomposition of La 0.3 Sr 0.7 CoO 3)d perovskite membrane if the membrane was operated under an oxygen partial pressure gradient of air/He for oxygen permeation, but no decomposition if the homogenous oxide powder was annealed in either flowing air or nitrogen for several days. In our case, the situation of BCF1585 membrane is similar to La 0.3 Sr 0.7 CoO 3)d membrane only with a difference in the oxygen chemical potential gradient.…”