Oxygen permeation and oxidative coupling of methane in membrane reactor: A new facile synthesis method for selective perovskite catalyst

A dense membrane of La0.6Sr0.4Co0.8Fe0.2O3−δ (LSCF) perovskite was prepared by a new chelating agent, ethylene diamine N,N,N′,N′-tetra N-acetyl diamine (EDTNAD). As a potent ligand, EDTNAD provided a facile one-step method to form complexes of the four metal ions, simultaneously. The oxygen permeation flux through the pure perovskite LSCF dense membrane was measured over temperature range of 1073–1223 K, thickness of 0.7–1.0 mm and oxygen partial pressure of 0.1–1.0 bar. Oxidative coupling of methane (OCM) reaction using LSCF disk in the atmospheric membrane reactor and over the temperature range of 1073–1173 K showed a C2 selectivity of 100% and C2 yield of 5.01% at 1153 K. Furthermore, OCM reaction data of the membrane reactor were discussed and compared with those of the fixed bed using the same perovskite powder as the catalyst.

A new complexation agent ethylene diamine N,N,N′,N′-tetra N-acetyl diamine (EDTNAD) was successfully used for facile single step preparation of the stable LSCF perovskite, La0.6Sr0.4Co0.8Fe0.2O3−δ. The LSCF membrane showed good oxygen permeability based on the bulk diffusion mechanism. OCM reaction using LSCF disk in the atmospheric membrane reactor conducted the process toward 100% C2 selectivity and high yield (5%) at 1153 K.Figure optionsDownload as PowerPoint slide