期刊
FUEL
卷 303, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2021.121332
关键词
Kraft lignin; Catalytic depolymerization; W-Ni-Mo/SEP; Liquid fuel; Phenol monomer
资金
- Key research and development projects in Anhui Province [202004a06020053]
- National Natural Science Foundation of China [51876001, 51906001]
- China Engineering Science and Technology Development Strategy-Anhui Research Institute [2018-02]
The highly efficient conversion of lignin to value-added liquid fuel or phenol monomers has attracted widespread attention. A W-Ni-Mo/SEP trimetallic catalyst was prepared for lignin catalytic depolymerization under supercritical ethanol, significantly improving the cycle stability and product selectivity compared to Mo/SEP. The catalyst formation increased oxygen vacancies, enhanced metal-support interaction, and reduced acid site content, leading to the production of lignin oil with higher HHV and increased selectivity to guaiacol and ethoxyphenol monomers.
Highly efficient conversion of lignin to value-added liquid fuel or phenol monomers has attracted widespread attentions. The W-Ni-Mo/SEP trimetallic catalyst was firstly prepared and used for lignin catalytic depolymerization (LCD) under supercritical ethanol, which significantly ameliorated the problem of complex product compositions and poor cycle-stability in Mo/SEP. Characterization results confirmed that doping W and Ni metals led to the transformation of metallic oxide phases, and then increased oxygen vacancies (OV), enhanced the metal-support interaction, and lowered acid site content. The experimental results revealed that W-Ni-Mo/ SEP yielded 39.56% of lignin oil (LO) with 32.37 MJ/kg of HHV at 280 degrees C for 4 h. The selectivity to guaiacol and ethoxyphenol monomer was remarkably increased as compare with Mo/SEP. Furthermore, the W-Ni-Mo/SEP catalyst exhibited unique cycle stability and produced LO even increased to 41.41% after five LCD cycles. The possible reaction paths of lignin converted to guaiacol and ethoxyphenol over W-Ni-Mo/SEP were proposed. Bronsted-acid site promoted the self-activation of ethanol to form aliphatic products. The higher OV preferentially adsorbed phenol-intermediates containing dual oxygens and activated direct dealkylation to obtain guaiacol. The lower Lewis-acid site promoted the demethylation of methoxy in side-chains of phenol intermediates and then interacted with free ethyl groups to form ethoxyphenol.
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