ammonia; hydrogen; reduced catalyst comprising 13 wtpercent Cu (calculated as CuO), 28 wtpercent Ni (calculated as NiO), 28 wtpercent Co (calculated as CoO), 31 wtpercent Zr (calculated as ZrO2) in water T=100 - 200°C; P=15001.5 - 150015 Torr; 36 h; AutoclaveInert atmosphere; Product distribution / selectivity;