STRUCTURE AND CATALYTICAL INVESTIGATION OF Fe-Mo AND Fe-Ni CATALYSTS FOR AMMONIS SYNTHESIS Yu.V. Maksimov, R. Arents, I.P. Suzdalev and V.K. Yatsimirski J. Phys. Colloques, 41 C1 (1980) C1-337 DOI: 10.1051/jphyscol:19801125