ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Mo-doped Al₂O₃-ZrO₂-based composite as catalyst for one-step production of alkyl-substituted monophenols from lignin via direct deoxygenation

Fang-Li Du, Yan-Ming Li, Xue-Quan Xian, Bo Lu, Gang Huang, Pei-Duo Tang, and Jun-Xiang Lai

National Engineering Research Center for Non-Food Biorefinery, State Key Laboratory of Non-Food Biomass and Enzyme Technology, Guangxi Key Laboratory of Bio-refinery, Guangxi Biomass Engineering Technology Research Center, Guangxi Academy of Science, Nanning, China

E-mail: jxlai@gxas.cn

Received: 28 March 2019  Accepted: 10 December 2019

Abstract:

Different reaction conditions on the conversion of lignin and monophenol yield were investigated under the catalysis of (5% Mo)-Al₂O₃-ZrO₂; the maximum conversion rate (78.9%) and monophenol yield (31.9%) were observed at 350 °C and 0.2 g catalyst using iso-propanol, in 45 min. The GC–MS analysis revealed that the main alkyl-substituted phenols are 4-ethyl-phenol (17.7%), 4-methyl-phenol (2.303%), phenol (1.878%), etc. The ¹H NMR and FT-IR results indicated the presence of alkyl-substituted phenols in liquefaction products, and the formation mechanism of alkyl-substituted phenols was also proposed.

Graphic Abstract:

Keywords: Lignin; Liquefaction; (5% Mo)-Al2O3-ZrO2; Alkyl-substituted monophenols; Formation mechanism

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-019-01031-1

Chemical Papers 74 (6) 1867–1880 (2020)