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Catalytic depolymerization of Kraft lignin to high yield alkylated-phenols over CoMo/SBA-15 catalyst in supercritical ethanol.
Rana, Masud; Ghosh, Shubho; Nshizirungu, Theoneste; Park, Jeong-Hun.
Afiliación
  • Rana M; Department of Environment and Energy Engineering, Chonnam National University Gwangju 61186 South Korea parkjeo1@jnu.ac.kr +82-62-530-1859 +82-62-530-1855.
  • Ghosh S; Department of Environment and Energy Engineering, Chonnam National University Gwangju 61186 South Korea parkjeo1@jnu.ac.kr +82-62-530-1859 +82-62-530-1855.
  • Nshizirungu T; Department of Environment and Energy Engineering, Chonnam National University Gwangju 61186 South Korea parkjeo1@jnu.ac.kr +82-62-530-1859 +82-62-530-1855.
  • Park JH; Department of Environment and Energy Engineering, Chonnam National University Gwangju 61186 South Korea parkjeo1@jnu.ac.kr +82-62-530-1859 +82-62-530-1855.
RSC Adv ; 13(43): 30022-30039, 2023 Oct 11.
Article en En | MEDLINE | ID: mdl-37842670
ABSTRACT
Lignin is generally considered to be a renewable and sustainable resource of aromatic chemicals. However, the depolymerization of Kraft lignin (KL) for the production of selective phenolic monomers presents a significant challenge due to its highly recalcitrant nature. Therefore, in this work, we investigated the effect of metal sites and acid active sites on Mo/SBA-15, Co/SBA-15 and CoMo/SBA-15 catalysts in supercritical ethanol for the depolymerization of KL to produce phenolic monomers. Ethanol was used as a hydrogen donor solvent instead of using external hydrogen. Results showed that the bimetallic CoMo/SBA-15 catalyst exhibited significantly higher catalytic activity compared to the monometallic, Co/SBA-15, Mo/SBA-15 or bare SBA-15. The highest phenolic monomers yield of 27.04 wt% was achieved at 290 °C for 4 h over CoMo/SBA-15 catalyst. The inter-unit linkages such as ß-O-4', ß-ß and α-O-4' in lignin were considerably cleaved during the catalytic depolymerization in supercritical ethanol. Meanwhile, higher functionality of carbonyl compounds was present in the non-catalytic bio-oil, while more alkylated phenols were produced over CoMo/SBA-15 catalyst. The major phenolic monomers identified in the catalytic bio-oil were 4-ethylguaiacol (9.15 wt%), 4-methylguaiacol (6.80 wt%), and 4-propylguaiacol (2.85 wt%). These findings suggest that the metal sites and abundant acid active sites of CoMo/SBA-15 had a synergistic effect toward the degradation of different linkages of lignin and production of selective phenolic monomers in bio-oils.

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: RSC Adv Año: 2023 Tipo del documento: Article

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: RSC Adv Año: 2023 Tipo del documento: Article