Promoting Effect of P in MoV Oxide-based Catalysts for Oxidative Desulfurization of Dibenzothiophene Compounds

• Published in: Topics in catalysis 2022-09, Vol.65 (13-16), p.1273-1285
• Main Authors: Martínez-Cornejo, Vanessa, López-Luna, Mauricio, Cedeño-Caero, Luis
• Format: Article
• Language: English
• Subjects: Aluminum oxide; Bimetals; Catalysis; Catalysts; Catalytic activity; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Desulfurizing; Dibenzothiophene; Diffuse reflectance spectroscopy; Fourier transforms; Industrial Chemistry/Chemical Engineering; Infrared spectroscopy; Original Paper; Oxidation; Performance evaluation; Pharmacy; Phosphorus; Physical Chemistry; Raman spectroscopy; Spectrum analysis; Sulfones; Sulfur; Sulfur compounds; Sulfur removal; Valence
• ISSN: 1022-5528; 1572-9028
• DOI: 10.1007/s11244-022-01609-2

Mo-V oxide-based catalysts were prepared on phosphorus-modified alumina, and were evaluated in oxidative desulfurization (ODS) process of a model solution of sulfur compounds. Impregnation order method, oxidation state and metal loading of active phases were varied to evaluate the ODS performance. The catalysts were characterized by temperature programmed reduction (TPR), N 2 adsorption–desorption, scanning electron microscopy (SEM–EDS), operando Raman spectroscopy, attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) and UV–vis diffuse reflectance spectroscopy (UV–vis DRS). The ODS catalytic activity was discussed in function of the sulfones yields and the Mo and V oxide surface species. The results show that the addition of phosphorus increased the intrinsic activity of the monometallic and bimetallic catalysts in the ODS process. With the best catalytic formulation, a total sulfur removal of 93% was obtained, in 30 min operating at 60 °C, to obtain ultra-low S level. The high activity was related to the increment in the polymeric species of Mo and the incorporation of P in the tetrahedral sites of alumina.