INTERACTIONS IN THE NIO-MOO3, SYSTEM UPON REDUCTION

DTA, TPR, X-ray phase analysis, and magnetic susceptibility measuremen ts were employed to investigate the interactions in NiO-MoO3 (MoO2) sy stems upon thermal treatment in air and H-2. The presence of NiO decre ases the starting temperature of MoO, reduction by >150 K due to atomi c H spillover from Ni to MoO3. At the same time, the retardation of Ni O reduction takes place at 573 - 623 K, as a result of NiMox alloy for mation. This retardation is not observed for NiO + MoO, samples, and t he NiMo, alloy is formed after quantitative NiO reduction. TPR profile s for impregnated NiO/MoO3 depend on the temperature of precalcination in an He flow.