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

Arriba, Agustín de; Delgado Muñoz, Daniel; Concepción, Patricia; López Nieto, José M.

doi:10.1016/j.cattod.2024.114965

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

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Delgado Muñoz, Daniel
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Arriba, A. d., Delgado Muñoz, D., Concepción, P., & López Nieto, J. M. (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: 114965. doi:10.1016/j.cattod.2024.114965.

Cite as: https://hdl.handle.net/21.11116/0000-000F-BDFD-0

Abstract

Metal-doped hexagonal tungsten oxide bronzes (h-WVO_x and h-WNbO_x) and metal-doped orthorhombic molybdenum oxide bronzes-M1 type (MoVO_x, MoVTeO_x and MoVTeNbO_x) have been synthesized hydrothermally and heat-treated at 400, 550 or 600 °C in N₂. The catalysts were characterized by several techniques and tested in the one-pot aerobic transformation of glycerol at 350 °C. From all of them, h-WNbO_x resulted as the most selective to acrolein (80 % yield), whereas both h-WVO_x and MoVTeNbO_x were more effective to acrylic acid (with a yield lower than 25 %). Subsequently, a double-bed reactor comparative study was conducted, with h-WNbO_x acting as the first catalytic bed. In this case, the yield to acrylic acid decreased as follows: MoVTeNbO_x > MoVTeO_x > MoVO_x> h-WVO_x. IR spectroscopy of acrolein adsorbed on these catalysts allows to explain the catalytic performance of these catalysts.