Butadiene Synthesis from Formaldehyde and Propylene on Mesoporous Metal Phosphates

• Published in: Petroleum chemistry 2023-07, Vol.63 (7), p.769-777
• Main Authors: Ponomareva, O. A., Dobryakova, I. V., Kostyukov, I. A., Kuskova, E. D., Grachev, A. L., Ryabchun, T. A., Roshchina, T. M., Ivanova, I. I.
• Format: Article
• Language: English
• Subjects: Aluminum compounds; Ammonia; Butadiene; Chemistry; Chemistry and Materials Science; Diffraction; Electronegativity; Formaldehyde; Industrial Chemistry/Chemical Engineering; Infrared spectroscopy; Low temperature; Niobium; NMR spectroscopy; Phosphates; Propylene; Rankings; Synthesis; X ray fluorescence analysis; X-ray spectroscopy; X-rays; Zirconium
• ISSN: 0965-5441; 1555-6239
• DOI: 10.1134/S0965544123030088

One-step gas-phase synthesis of butadiene from formaldehyde and propylene on aluminum (AlP), zirconium (ZrP), and niobium (NbP) phosphates with the pore volumes of 0.51, 0.25, and 0.19 cm 3 /g, respectively, was studied for the first time. The physicochemical properties of the catalysts were studied by X-ray fluorescence analysis, low-temperature nitrogen adsorption, X-ray diffraction analysis, scanning electron microscopy, temperature-programmed NH 3 desorption, IR spectroscopy of adsorbed pyridine, and 31 Р MAS NMR. Evaluation of the catalytic properties of the phosphates showed that they can be ranked in the following order with respect to the formaldehyde conversion and target product (butadiene) formation selectivity: AlP < ZrP < NbP, which correlates with metal electronegativity series. The СН 2 О conversion on the most active NbP was 4.5%, and the molar selectivity of the butadiene formation was 45.3%.