La_0.6Sr_0.4Co_0.8Ga_0.2O_3‐δ (LSCG) hollow fiber membrane reactor: Partial oxidation of methane at medium temperature

Abstract

In this study, La 0.6 Sr 0.4 Co 0.8 Ga 0.2 O 3-d (LSCG) hollow fiber membrane reactor was integrated with Ni/LaAlO 3 -Al 2 O 3 catalyst for the catalytic partial oxidation of methane (POM) reaction. The process was successfully carried out in the medium temperature range (600-800 C) for reaction of blank POM with bare membrane, catalytic POM reaction and swept with H 2 :CO gas mixture. For the catalytic POM reaction, enhancement in selectivity to H 2 and CO is obtained between 650-750 C when O 2 :CH 4 <1. High CH 4 conversion of 97% is achieved at 750 C with corresponding H 2 and CO selectivity of about 74 and 91%. The oxygen flux of the membranes also increased with the increase in oxygen partial pressure gradient across the membrane. The postreacted membranes were tested via XRD and FESEM-EDX for their crystallinity and surface morphology. XPS analysis was further used to investigate the O1s, Co 2p and Sr 3d binding energies of the segregated elements from the reducing reaction environment.

Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review

“…Kathiraser et al [215] reported a study on the La 0.6 Sr 0.4 Co 0.8 Ga 0.2 O 3-δ hollow fiber membrane. The authors introduced the Ga 3+ cation in the membrane structure to improve its mechanical stability.…”

A review on coke management during dry reforming of methane

“…Kathiraser et al [166] and Kathiraser and Kawi [167] showed a composite Lanthanum-Strontium-Cobalt-Gallium oxide membrane-type reactor to produced up to 94% and 73% conversion of methane and carbon dioxide, respectively, during dry reforming over Ni-supported and La-supported Al 2 O 3 catalyst system at moderate temperatures. Catalyst was completely stable with no detectable coke deposition for 160 h period.…”

Enhancing co‐production of H2 and syngas via water splitting and POM on surface‐modified oxygen permeable membranes

“…If not oxidized, carbon remains attached to an otherwise active site and slows down the surface reaction in a manner similar to catalyst poisoning . Conversely, carbon oxidation can follow either partial oxidation or combustion depending on catalysts and reactant flow rates . As lattice oxygen is more active than gas‐phase oxygen species in oxidizing carbon species, the oxygen flux from water thermolysis on the feed side can affect the relative concentrations of these carbon species.…”

“…To increase the oxygen flux further, we added a catalyst to the porous layer on the sweep side to accelerate the surface reaction. Nickel catalysts are reported to be one of the most effective base metal catalysts for POM in both packed bed or membrane reactors . While solid carbon is prone to form on nickel from methane decomposition, it is found that the active lattice oxygen from the catalysts or the support can facilitate the oxidation of surface carbon or soot .…”