Mixed metal oxide bronzes as catalysts for the gas-phase aerobic transformation of glycerol to acrylic acid: Single or double catalytic bed approaches

Abstract

[EN] Metal-doped hexagonal tungsten oxide bronzes (h-WVOx and h-WNbOx) and metal-doped orthorhombic molybdenum oxide bronzes-M1 type (MoVOx, MoVTeOx and MoVTeNbOx) have been synthesized hydrothermally and heat-treated at 400, 550 or 600 degrees C in N-2. The catalysts were characterized by several techniques and tested in the one-pot aerobic transformation of glycerol at 350 degrees C. From all of them, h-WNbOx resulted as the most selective to acrolein (80 % yield), whereas both h-WVOx and MoVTeNbOx were more effective to acrylic acid (with a yield lower than 25 %). Subsequently, a double-bed reactor comparative study was conducted, with h-WNbOx acting as the first catalytic bed. In this case, the yield to acrylic acid decreased as follows: MoVTeNbOx > MoVTeOx > MoVOx > h-WVOx. IR spectroscopy of acrolein adsorbed on these catalysts allows to explain the catalytic performance of these catalysts.The funding received for this study from the Spanish Ministry of Science and Innovation, PID2021-126235OB-C31 funded by MCIN/AEI/10.13039/501100011033 and FEDER funds, and project TED2021-130756B-C32 funded by MCIN/AEI/10.13039/501100011033 and by "ERDF A way of making Europe" by the European Union NextGenerationEU/PRTR, is acknowledged. This Special Issue is dedicated to honor the 10th International Symposium on Group V (IV and VI) Elements, a gathering of interna-tional researchers, industry, young researchers, and students to help shape the vision of the future for these elements.De Arriba-Mateos, A.; Delgado-Muñoz, D.; Concepción Heydorn, P.; López Nieto, JM. (2025). Mixed metal oxide bronzes as catalysts for the gas-phase aerobic transformation of glycerol to acrylic acid: Single or double catalytic bed approaches. Catalysis Today. 443. https://doi.org/10.1016/j.cattod.2024.11496544