In Situ Generated Dispersed Catalysts Based on Molybdenum and Tungsten Phosphides in Hydroprocessing of Guaiacol

• Published in: Petroleum chemistry Vol. 62; no. 11; pp. 1300 - 1307
• Main Authors: Golubeva, M. A., Mukhtarova, M., Bugaev, A. L., Naranov, E. R.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.11.2022; Springer; Springer Nature B.V
• Subjects: Anisole; Carbonyls; Catalysts; Chemistry; Chemistry and Materials Science; Cresols; Diffraction; Fine structure; Hydrogen; Industrial Chemistry/Chemical Engineering; Molybdenum; Phenols; Phosphides; Photoelectrons; Reaction products; Selectivity; Toluene; Tungsten; X ray absorption; X ray photoelectron spectroscopy; X ray powder diffraction; X-ray spectroscopy; X-rays; hydrodeoxygenation; tungsten phosphide; guaiacol; phenol; molybdenum phosphide; dispersed catalysts
• ISSN: 0965-5441; 1555-6239
• DOI: 10.1134/S0965544122110019

Amorphous catalysts based on molybdenum and tungsten phosphides were prepared in situ from oil-soluble precursors such as triphenylphosphine and carbonyls of the corresponding metals during hydrodeoxygenation of guaiacol. These catalysts were characterized by powder X-ray diffraction, X-ray photoelectron spectroscopy, extended X-ray absorption fine structure spectroscopy, and transmission electron microscopy. After 6 h of reaction at 320–380°C and an initial hydrogen pressure of 5 MPa, the guaiacol conversion amounted to 89–91% in the presence of the molybdenum phosphide catalyst and 80–86% with tungsten phosphide. The selectivity towards phenol as the main reaction product reached as high as 80% in the presence of molybdenum phosphide (360°C, 6 h) and 78% in the tungsten phosphide case (340°C, 1 h). In the presence of both catalytic systems, the reaction products also contained anisole, cresols, and toluene.