Two types of NOx removal membrane reactors using an oxygen-permeable dense film of La_(0.2)Sr_(0.8)Co_(0.8)Fe_(0.2)O_(3-&) (LSCF2882) were constructed and their working performance was investigated. One reactor is the NO decomposition type, NO|LSCF2882|He, to catalyze the direct decomposition of NO (2NO -> N_2 + O_2) and the otheris the NO reduction type, NO|LSCF2882|CH4, to catalyze the reduction of NO with CH_4 (4NO + CH_4 -> 2N_2 + CO_2 + 2H_2O). Both types of membrane reactors worked steadily, and the rate of N_2 formation at the NO side, R[N_2], in the reduction-type reactor was higher than that in the decomposition-type reactor. When La_(0.8)Sr_(0.2)CoO_3 powder catalyst was coated on the NO side, R[N_2] was increased but the rates of O_2 and CO_2 formation at the other side of the membrane were lower than the values expected from the R[N_2], indicating that the reactor performance is limited by the rate of oxygen permeation through the membrane.
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