Oxidative Depolymerization of Kraft Lignin to Aromatics Over Bimetallic V–Cu/ZrO2 Catalysts
Abdelaziz, Omar Y. LU ; Clemmensen, Ida ; Meier, Sebastian ; Bjelić, Saša ; Hulteberg, Christian P. LU
and Riisager, Anders
(2023)
In Topics in Catalysis
66(17-18).
p.1369-1380
- Abstract
Zirconia-supported vanadium–copper catalysts (VCux:yZr) were used for the oxidative depolymerization of softwood LignoBoost Kraft lignin (LB). Various VCux:yZr catalysts were prepared (x:y = 0:1, 1:4, 1:2, 3:4, 1:1, and 1:0) by incipient wetness impregnation, and reactions were performed in alkaline water at 150 °C under an O2 pressure of 5 bar for 10 min. 1H–13C HSQC NMR spectroscopy was used for product identification and quantification. The most promising catalyst was VCu1:2Zr, giving a total monomer yield of 9 wt% and the highest selectivity for vanillin (59%). This catalyst was characterized before and after use by N2 physisorption, XRD, TGA, SEM-EDS, and XPS. Cleavage of the main... (More)
Zirconia-supported vanadium–copper catalysts (VCux:yZr) were used for the oxidative depolymerization of softwood LignoBoost Kraft lignin (LB). Various VCux:yZr catalysts were prepared (x:y = 0:1, 1:4, 1:2, 3:4, 1:1, and 1:0) by incipient wetness impregnation, and reactions were performed in alkaline water at 150 °C under an O2 pressure of 5 bar for 10 min. 1H–13C HSQC NMR spectroscopy was used for product identification and quantification. The most promising catalyst was VCu1:2Zr, giving a total monomer yield of 9 wt% and the highest selectivity for vanillin (59%). This catalyst was characterized before and after use by N2 physisorption, XRD, TGA, SEM-EDS, and XPS. Cleavage of the main interunit linkages in LB, including the β-O-4 bonds and recalcitrant C–C bonds, was also observed. The findings of this study demonstrate the potential of the V–Cu/ZrO2 catalyst system in the production of value-added aromatics from technical lignin under relatively mild conditions. This would contribute to the more sustainable use of an underutilized side-stream in forest-based industries, provided catalyst reuse can be successfully demonstrated.
(Less)
- author
- Abdelaziz, Omar Y.
LU
; Clemmensen, Ida
; Meier, Sebastian
; Bjelić, Saša
; Hulteberg, Christian P.
LU
and Riisager, Anders
- organization
- publishing date
- 2023
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Aromatic chemicals, Biomass conversion, Heterogeneous catalysis, Lignin valorization, Technical lignin, V–Cu/ZrO catalyst
- in
- Topics in Catalysis
- volume
- 66
- issue
- 17-18
- pages
- 12 pages
- publisher
- Springer
- external identifiers
-
- scopus:85159706257
- ISSN
- 1022-5528
- DOI
- 10.1007/s11244-023-01826-3
- language
- English
- LU publication?
- yes
- id
- 517f4457-f50d-4f1b-953d-8f11727bb827
- date added to LUP
- 2023-07-17 09:34:53
- date last changed
- 2023-12-21 14:12:36
@article{517f4457-f50d-4f1b-953d-8f11727bb827,
abstract = {{<p>Zirconia-supported vanadium–copper catalysts (VCux:yZr) were used for the oxidative depolymerization of softwood LignoBoost Kraft lignin (LB). Various VCux:yZr catalysts were prepared (x:y = 0:1, 1:4, 1:2, 3:4, 1:1, and 1:0) by incipient wetness impregnation, and reactions were performed in alkaline water at 150 °C under an O<sub>2</sub> pressure of 5 bar for 10 min. <sup>1</sup>H–<sup>13</sup>C HSQC NMR spectroscopy was used for product identification and quantification. The most promising catalyst was VCu1:2Zr, giving a total monomer yield of 9 wt% and the highest selectivity for vanillin (59%). This catalyst was characterized before and after use by N<sub>2</sub> physisorption, XRD, TGA, SEM-EDS, and XPS. Cleavage of the main interunit linkages in LB, including the β-O-4 bonds and recalcitrant C–C bonds, was also observed. The findings of this study demonstrate the potential of the V–Cu/ZrO<sub>2</sub> catalyst system in the production of value-added aromatics from technical lignin under relatively mild conditions. This would contribute to the more sustainable use of an underutilized side-stream in forest-based industries, provided catalyst reuse can be successfully demonstrated.</p>}},
author = {{Abdelaziz, Omar Y. and Clemmensen, Ida and Meier, Sebastian and Bjelić, Saša and Hulteberg, Christian P. and Riisager, Anders}},
issn = {{1022-5528}},
keywords = {{Aromatic chemicals; Biomass conversion; Heterogeneous catalysis; Lignin valorization; Technical lignin; V–Cu/ZrO catalyst}},
language = {{eng}},
number = {{17-18}},
pages = {{1369--1380}},
publisher = {{Springer}},
series = {{Topics in Catalysis}},
title = {{Oxidative Depolymerization of Kraft Lignin to Aromatics Over Bimetallic V–Cu/ZrO<sub>2</sub> Catalysts}},
url = {{http://dx.doi.org/10.1007/s11244-023-01826-3}},
doi = {{10.1007/s11244-023-01826-3}},
volume = {{66}},
year = {{2023}},
}