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Promoting Effect of Ce and La on Ni-Mo/δ-Al2O3 Catalysts in the Hydrodeoxygenation of Vanillin

Kristensen, Tove A. LU ; Hulteberg, Christian P. LU orcid ; Wallenberg, Reine L. LU ; Abdelaziz, Omar Y. LU and Blomberg, Sara LU (2024) In Energy and Fuels 38(11). p.9827-9835
Abstract

A crucial aspect of adding an economical and environmental dimension to the upgrading of bio-oils is to develop catalysts with enhanced and prolonged activity. In the present study, the effect of doping δ-alumina (Al2O3) with oxides of cerium (Ce) and lanthanum (La) before thermal treatment was investigated. The performance of such an Al2O3-supported nickel-molybdenum (Ni-Mo) catalyst was evaluated by studying the selectivity for the direct hydrodeoxygenation (HDO) of vanillin to cresol under continuous-flow conditions. In addition, the effect of adding H2S during catalyst activation and/or performance tests was also evaluated. Overall, enhanced performance of the doped NiMo... (More)

A crucial aspect of adding an economical and environmental dimension to the upgrading of bio-oils is to develop catalysts with enhanced and prolonged activity. In the present study, the effect of doping δ-alumina (Al2O3) with oxides of cerium (Ce) and lanthanum (La) before thermal treatment was investigated. The performance of such an Al2O3-supported nickel-molybdenum (Ni-Mo) catalyst was evaluated by studying the selectivity for the direct hydrodeoxygenation (HDO) of vanillin to cresol under continuous-flow conditions. In addition, the effect of adding H2S during catalyst activation and/or performance tests was also evaluated. Overall, enhanced performance of the doped NiMo catalyst in the HDO process has been demonstrated and an increased selectivity for cresol via direct HDO observed. The advantage of adding La and Ce is supported by the characterization results, where less sintering and enhanced pore diameter of the doped Al2O3 were observed after thermally inducing the transformation from the δ to θ phases. The improved characteristics and prolonged activity of the doped Al2O3 were also deduced by the lower acidity of the catalyst, which resulted in reduced coke formation during the HDO process.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Energy and Fuels
volume
38
issue
11
pages
9 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • pmid:38863686
  • scopus:85193732361
ISSN
0887-0624
DOI
10.1021/acs.energyfuels.4c00898
language
English
LU publication?
yes
id
cfcae80c-7cbf-4b7a-aa26-16936401decb
date added to LUP
2024-06-18 15:16:59
date last changed
2025-01-29 14:39:52
@article{cfcae80c-7cbf-4b7a-aa26-16936401decb,
  abstract     = {{<p>A crucial aspect of adding an economical and environmental dimension to the upgrading of bio-oils is to develop catalysts with enhanced and prolonged activity. In the present study, the effect of doping δ-alumina (Al<sub>2</sub>O<sub>3</sub>) with oxides of cerium (Ce) and lanthanum (La) before thermal treatment was investigated. The performance of such an Al<sub>2</sub>O<sub>3</sub>-supported nickel-molybdenum (Ni-Mo) catalyst was evaluated by studying the selectivity for the direct hydrodeoxygenation (HDO) of vanillin to cresol under continuous-flow conditions. In addition, the effect of adding H<sub>2</sub>S during catalyst activation and/or performance tests was also evaluated. Overall, enhanced performance of the doped NiMo catalyst in the HDO process has been demonstrated and an increased selectivity for cresol via direct HDO observed. The advantage of adding La and Ce is supported by the characterization results, where less sintering and enhanced pore diameter of the doped Al<sub>2</sub>O<sub>3</sub> were observed after thermally inducing the transformation from the δ to θ phases. The improved characteristics and prolonged activity of the doped Al<sub>2</sub>O<sub>3</sub> were also deduced by the lower acidity of the catalyst, which resulted in reduced coke formation during the HDO process.</p>}},
  author       = {{Kristensen, Tove A. and Hulteberg, Christian P. and Wallenberg, Reine L. and Abdelaziz, Omar Y. and Blomberg, Sara}},
  issn         = {{0887-0624}},
  language     = {{eng}},
  number       = {{11}},
  pages        = {{9827--9835}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Energy and Fuels}},
  title        = {{Promoting Effect of Ce and La on Ni-Mo/δ-Al<sub>2</sub>O<sub>3</sub> Catalysts in the Hydrodeoxygenation of Vanillin}},
  url          = {{http://dx.doi.org/10.1021/acs.energyfuels.4c00898}},
  doi          = {{10.1021/acs.energyfuels.4c00898}},
  volume       = {{38}},
  year         = {{2024}},
}