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<p>Catalyst performance is one of the most decisive aspects for adding value to the industrial prospects of the hydrodeoxygenation (HDO) of lignin-derived oils to fuels. Deactivation of the catalyst, associated with blockage of pores and active sites due to diffusion limitations and the polymerization of bulky phenolic-type compounds, presents a significant challenge. In the present study, textural properties (pore diameter and surface area) are optimized by doping Al<sub>2</sub>O<sub>3</sub> with La- and/or Ce-precursors prior to inducing a phase transformation and pore coarsening through heat exposure. Response surface methodology and analysis of variance were applied to evaluate the optimal ratios (between 0 and 5 wt%) of the dopants to maximize the pore diameter while preserving the surface area for three different impregnation approaches. The dopants were either impregnated simultaneously or separately and calcined at 1100&#xa0;°C–500&#xa0;°C. Finally, the overall performance of synthesized Ni-Mo catalysts, supported on doped Al<sub>2</sub>O<sub>3</sub>, for the HDO process of vanillin under continuous-flow conditions (<i>T</i> = 314&#xa0;°C, <i>P</i> = 5&#xa0;bar(g), and <i>WHSV</i> = 35&#xa0;h<sup>− 1</sup>) was assessed. Statistically significant regression models for tuning the textural properties of the supports were developed, showing that a maximized pore diameter is obtained by doping with 5 wt% La. However, the findings of this study indicate that Ni-Mo/Al<sub>2</sub>O<sub>3</sub> catalysts doped with 1 wt% La and 1 wt% Ce are favored for the direct HDO process. An additional beneficial aspect is the low amount of carbon deposition on these catalysts.</p>

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Improving hydrodeoxygenation over Ni-Mo/Al2O3 by tuning the textural properties of the support via doping with lanthanoid group metals

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月19日

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  • Tove A. Kristensen,
  • Jon Selimi,
  • Jonas Elmroth Nordlander,
  • Omar Y. Abdelaziz,
  • Christian P. Hulteberg,
  • Sara Blomberg

摘要

Catalyst performance is one of the most decisive aspects for adding value to the industrial prospects of the hydrodeoxygenation (HDO) of lignin-derived oils to fuels. Deactivation of the catalyst, associated with blockage of pores and active sites due to diffusion limitations and the polymerization of bulky phenolic-type compounds, presents a significant challenge. In the present study, textural properties (pore diameter and surface area) are optimized by doping Al2O3 with La- and/or Ce-precursors prior to inducing a phase transformation and pore coarsening through heat exposure. Response surface methodology and analysis of variance were applied to evaluate the optimal ratios (between 0 and 5 wt%) of the dopants to maximize the pore diameter while preserving the surface area for three different impregnation approaches. The dopants were either impregnated simultaneously or separately and calcined at 1100 °C–500 °C. Finally, the overall performance of synthesized Ni-Mo catalysts, supported on doped Al2O3, for the HDO process of vanillin under continuous-flow conditions (T = 314 °C, P = 5 bar(g), and WHSV = 35 h− 1) was assessed. Statistically significant regression models for tuning the textural properties of the supports were developed, showing that a maximized pore diameter is obtained by doping with 5 wt% La. However, the findings of this study indicate that Ni-Mo/Al2O3 catalysts doped with 1 wt% La and 1 wt% Ce are favored for the direct HDO process. An additional beneficial aspect is the low amount of carbon deposition on these catalysts.