ammonia; hydrogen; catalyst precursor whose active composition comprised 50percent by weight of Ni, calculated as NiO, 18percent by weight of Cu, calculated as CuO, 2percent by weight of Mo, calculated as MoO3, and 30percent by weight or Zr, calculated as ZrO2 in water T=192°C; P=150015 Torr; 1076 h; Product distribution / selectivity;