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<p>In this work, the catalytic performance of sulfided CoMoW/Nb<sub>x</sub>-SBA-15 systems was investigated in the hydrodesulfurization (HDS) of dibenzothiophene (DBT). Nb<sub>x</sub>-SBA-15 substrates with nominal Si/Nb molar ratios of 80, 100, and 120 were prepared via a direct sol–gel method and characterized by XRD, UV–vis DRS, N<sub>2</sub> adsorption–desorption isotherms, XRF, FESEM, EDS, and pyridine-adsorbed FTIR, along with catalytic performance tests. The Nb<sub>x</sub>-SBA-15 materials exhibited both Brønsted and Lewis acid sites, whose concentrations increased with increasing Nb content. Incorporation of niobium, both within the SBA-15 framework and as well dispersed extra-framework species, led to enhanced catalytic activity of the sulfided CoMoW catalysts compared to the Nb-free sample. This improvement is mainly associated with the Nb-induced increase in surface acidity and modified metal–support interaction effects, which contribute to improved dispersion of the active sulfided phases. Catalytic activity showed a nearly linear dependence on Nb content, reaching a maximum at a Si/Nb molar ratio of 80. These results demonstrate that controlled Nb incorporation efficiently tunes the acidic and structural properties of SBA-15 while preserving its ordered mesoporous morphology, resulting in enhanced HDS performance.</p> Graphical abstract <p></p>

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HDS performance of sulfided CoMoW/Nb-SBA-15 catalysts: effect of Nb content

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月9日

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  • O. Fonseca-Maya,
  • B. M. Millán-Malo,
  • R. Huirache-Acuña,
  • T. A. Zepeda,
  • L. Pérez-Cabrera,
  • R. Nava,
  • E. M. Rivera-Muñoz

摘要

In this work, the catalytic performance of sulfided CoMoW/Nbx-SBA-15 systems was investigated in the hydrodesulfurization (HDS) of dibenzothiophene (DBT). Nbx-SBA-15 substrates with nominal Si/Nb molar ratios of 80, 100, and 120 were prepared via a direct sol–gel method and characterized by XRD, UV–vis DRS, N2 adsorption–desorption isotherms, XRF, FESEM, EDS, and pyridine-adsorbed FTIR, along with catalytic performance tests. The Nbx-SBA-15 materials exhibited both Brønsted and Lewis acid sites, whose concentrations increased with increasing Nb content. Incorporation of niobium, both within the SBA-15 framework and as well dispersed extra-framework species, led to enhanced catalytic activity of the sulfided CoMoW catalysts compared to the Nb-free sample. This improvement is mainly associated with the Nb-induced increase in surface acidity and modified metal–support interaction effects, which contribute to improved dispersion of the active sulfided phases. Catalytic activity showed a nearly linear dependence on Nb content, reaching a maximum at a Si/Nb molar ratio of 80. These results demonstrate that controlled Nb incorporation efficiently tunes the acidic and structural properties of SBA-15 while preserving its ordered mesoporous morphology, resulting in enhanced HDS performance.

Graphical abstract