Abstract: A double-layer catalyst, containing a NiZrO catalyst for propane oxidative dehydrogenation and a Mo-based mixed metal oxide catalyst for propylene selective oxidation, was applied to propane selective oxidation to acrylic acid. The composition of the combined catalyst was first adjusted. When the mass ratio of the two components was 1:1, a maximum acrylic acid yield was achieved. The effects of reaction conditions were studied, including temperature, space velocity, V(C₃H₈)/V(O₂) ratio, and N₂ content. Based on the use of an O₂-distributor, the stability test was carried out. During 30 h operation at 340 ^oC, propane conversion and acrylic acid selectivity remained at ~20% and ~74%, respectively.

Key words: propane, selective oxidation, acrylic acid, combined catalyst, O2-distributor