INTERNAL COMBUSTION ENGINE AND OPERATING METHOD OF SAME

The invention relates to an internal combustion engine that comprises a first Brayton cycle comprising a mixed ionic-electronic conducting (MIEC) membrane that separates the O2 from the air such that the suctioned air current is free from N2; a second Brayton cycle combined in a binary manner with the first Brayton cycle and nested with a cycle selected from an Otto cycle and a diesel cycle performed by means of oxy-combustion. The second Brayton cycle transmits mechanical energy and thermal energy from exhaust gases to the first Brayton cycle. The first Brayton cycle provides to the second Brayton cycle compressed O2 from the MIEC membrane. By means of the present engine, the NOx emission into the atmosphere is prevented by the separation of N2 in the MIEC membrane.