The catalytic oxidative coupling of methane (OCM) to C

2

hydrocarbons (C

2

H

6

and C

2

H

4

) represents one of the most effective ways to convert natural gas to more useful products

which can be performed effectively using La

0.6

Sr

0.4

Co

0.2

Fe

0.8

O

3-

δ

(LSCF) perovskite hollow fiber membrane microreactor. In this work

the effects of adding a thin BaCe

0.8

Gd

0.2

O

3-

δ

(BCG) catalyst film onto the inner LSCF fiber surface as the OCM catalyst and a porous Ba

0.5

Sr

0.5

Co

0.8

Fe

0.2

O

3-

δ

(BSCF) perovskite layer onto the outer LSCF surface to improve the oxygen permeation were evaluated. Between 700 ℃ and 1000 ℃

methane conversion increased in the order of uncoated

BCG and BSCF-coated

and BCG-coated LSCF hollow fiber while C

2

-selectivity and C

2

-yield increased in the order of BCG and BSCF-coated

uncoated

and BCG-coated LSCF hollow fiber. Oxygen permeation flux at the same temperature range

on the other hand

was enhanced in the order of uncoated

BCG-coated

and BCG an

d BSCF-coated LSCF hollow fiber. This finding demonstrates the complex interplay between oxygen permeation and OCM performance. The BCG and BSCF-coated hollow fiber was also subjected to thermal cycles between 850 ℃ and 900 ℃ for up to 175 hours during which the fiber showed minor degradation in oxygen permeation fluxes and relatively stable OCM performance.