Process for the preparation of nitrogen-containing compounds

Process for the preparation of nitrogen-containing Compound, comprising the steps of: a) bringing N2 optionally NH3 and optionally a recycle stream together with a carbon- and hydrogen-containing Compound or carbon-containing Compound and H2 to form a reaction mixture, whereby the ammonia in the reaction mixture, if present, originates for at least 30 wt.% from the recycle stream; b) bringing the reaction mixture in contact with a catalyst at temperature lying between 200 C and 800 C and at a space velocity between 102 and 106 ml/(g.h.), said catalyst containing M1 on support, M1 being chosen from the group of metals in group 3,4,5,6,7,8,9,10,11 and 12 of the IUPAC Periodic Table of Elements or mixtures thereof, whereby the nitrogen-containing Compound is formed; c) optionally separating, subsequent to step b), portion between 1 and 99 vol.% off from reaction mixture, said portion being the recycle stream.