Nickel and Rhenium Mixed Oxides-Doped Graphene Oxide (MOs/GO) Catalyst for the Oxidative Depolymerization of Fractionated Bagasse Lignin

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Author list: Totong, Sansanee; Laosiripojana, Weerawan; Laosiripojana, Navadol; Daorattanachai, Pornlada;

Publisher: American Chemical Society

Publication year: 2022

Journal: Industrial & Engineering Chemistry Research (0888-5885)

Volume number: 61

Issue number: 1

Start page: 215

End page: 223

Number of pages: 9

ISSN: 0888-5885

eISSN: 1520-5045

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85122561827&doi=10.1021%2facs.iecr.1c03848&partnerID=40&md5=afaaf75e056703efdfef84ff39921473

Languages: English-Great Britain (EN-GB)

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Abstract

The oxidative lignin conversion into small phenolic compounds is an attractive route for lignin valorization. The major challenge of this process is to control the bond cleavage reactions due to the highly complex network of lignin and/or catalyst inefficiencies. In the present work, we integrated the catalytic functions of graphene oxide (GO) and metal oxides for oxidative depolymerization of fractionated bagasse lignin without addition of any oxidizers. A series of graphene oxide-based metal oxides with different metal-oxide phases (Ni, Re, and Ni–Re) were evaluated for their catalytic performance in terms of lignin conversion, total phenolic yield, and char yield. NiO/GO achieved 23.7% of phenolic products, producing guaiacol as the major product. Interestingly, addition of rhenium (Re) into NiO/GO promoted the catalytic performance because Re could improve the metal dispersion properties as well as selectivity in ether bond cleavage in the lignin structure. The most promising results were obtained using NiO–Re2O7/GO, giving a phenolic yield of 28.4%. For catalyst recycling studies, NiO–Re2O7/GO could preserve a constant level of phenolic yield for at least five recycle runs. This work provided an efficient catalyst for oxidative lignin depolymerization, which could be a promising choice for the utilization of lignin. © 2021 American Chemical Society

Keywords

catalysts