Al2O3-sheet Intercalation into MoV Oxides for Selective Acrolein Oxidation: Suppressing Volatilization, Good Dispersity and Thermal Conductivity

Abstract

In industry, MoV catalysts are usually used for acrolein oxidation to acrylic acid. But this process is strongly exothermic reaction, high temperatures lead to Mo and V sublimation, and lost part activity. In this work, we prepared three kinds of morphologies Al₂O₃, i.e., Al₂O₃-flower (Al-F), Al₂O₃-irregular (Al-I), Al₂O₃-sheet (Al-S), and coupled them with MoV oxides, respectively, and obtain three kinds of catalysts, MoV-F, MoV-I and MoV-S. We found that the catalytic performance has the order of MoV-S > MoV-I > MoV-F, and MoV-S perform highest acrylic acid selectivity (85.6%). It is found that intercalated Al-S achieve better MoV oxides uniform dispersion, small MoV particles result in rich lattice oxygens, which contributed to its enhanced oxidation capability. Besides, Al-S obtains good thermal conductivity, and this facilitates reaction heat transfer and stability of the catalyst. This study provides new insights into the MoV catalyst for selective oxidation reaction with strong exothermic process.