Catalytic Conversion of Enzymatic Hydrolysis Lignin into Cycloalkanes over a Gamma-Alumina Supported Nickel Molybdenum Alloy Catalyst

Qingfeng Liu, Yunfei Bai, Hong Chen, Mengmeng Chen, Yushuai Sang, Kai Wu, Zewei Ma, Yiming Ma, Yongdan Li

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

Abstrakti

The efficient depolymerization and hydrodeoxygenation of enzymatic hydrolysis lignin are achieved in cyclohexane solvents over a gamma-alumina supported nickel molybdenum alloy catalyst in a single step. Under initial 3 MPa hydrogen at 320 °C, the highest overall cycloalkane yield of 104.4 mg/g enzymatic hydrolysis lignin with 44.4 wt% selectivity of ethyl-cyclohexane was obtained. The reaction atmosphere and temperature have significant effects on enzymatic hydrolysis lignin conversion, product type and distribution. The conversion of enzymatic hydrolysis lignin was also investigated over different nickel and molybdenum-based catalysts, and the gamma-alumina supported nickel molybdenum alloy catalyst exhibited the highest activity among those catalysts. To reveal the reaction pathways of alkylphenol hydrodeoxygenation, 4-ethylphenol was tested as a model compound. Complete conversion of 4-ethylphenol into cycloalkanes was achieved. A two-step mechanism of 4-ethylphenol dihydroxylation - hydrogenation is proposed, in which the benzene ring saturation is deemed as the rate-determining step.
AlkuperäiskieliEnglanti
Artikkeli124634
JulkaisuBioresource Technology
Vuosikerta323
Varhainen verkossa julkaisun päivämäärä31 joulukuuta 2020
DOI - pysyväislinkit
TilaJulkaistu - maaliskuuta 2021
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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