Preparation of the hollow fiber type perovskite catalyst for methane complete oxidation

Bead type and hollow fiber type catalyst (HFC, Hollow Fiber type Catalyst) was prepared by La0.1Sr_0.9 Co_0.2Fe_0.8O₃-δ (LSCF1928) perovskite powder catalyst which showed excellent methane complete oxidation characteristics through previous studies. The HFC have a cylindrical shape with an empty interior, and pores can be formed through Phase inversion method so the specific surface area can be remarkably improved. In the case of the bead type catalyst prepared by adding Methyl Cellulose (MC), SrCO₃ was produced in addition to the original catalyst composition of LSCF1928 due to the reaction of CO₂ emitted from MC and Sr of the catalyst. In the case of the HFC, a single phase perovskite structure was obtained without impurities. The HFC calcined at 700-900 °C showed pore structure of finger-sponge-finger structure, and 99.9% oxygen conversion rate was achieved through complete oxidation of methane at 475 °C. Air gap and spinning pressure condition were changed to control the HFC pore. 2 cm air gap and 7 bar spinning pressure showed the best catalytic performance and achieved oxygen conversion rates of more than 70.65%, 93.01%, and 99.99% at 425 °C, 450 °C and 475 °C, respectively.