ChemCatChem
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2026
·Vol. 18
·期 1
·e01678
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IF 3.9
Zien Bao,Xiaohong Ren,Xiaoxin Wang,Zeming Rong
This study focuses on the catalytic transformation of a lignin model compound, 4-propylguaiacol, without external hydrogen. The reaction using a Ni/MgO catalyst and water as the solvent, conducted at 220°C under 5 bar N 2 for 2 h, achieved 97.8% conversion and 94.8% selectivity toward phenolic products. During the reaction, the methoxy group in 4-propylguaiacol is cleaved from the aromatic ring at Ni active sites and subsequently reacts with hydrogen radicals generated from water dissociation to form methanol. The methanol then undergoes aqueous-phase reforming, providing additional in-situ hydrogen to drive the hydrodeoxygenation process. The Ni/MgO catalyst showed good recyclability over three consecutive cycles, with only a slight decline in activity. Furthermore, this catalyst was applied to the depolymerization of real lignin, and the effects of reaction parameters on product yield were investigated. Among the tested conditions, a maximum monomer yield of 76.7 wt% was obtained at 280°C under 5 bar N 2 for 6 h. Graphical This work presents a sustainable strategy for producing phenolic monomers from lignin-derived compounds using non-noble metal catalysts without external hydrogen.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ruyang Song,Jinghong Wen,Hongji Liu,Wenjing Song,Chuanyue Sun,Bo Wang,Shuo Tao,Abdullah N. Alodhayb,Jinsheng Zhao,Zhou Chen,Xiaodong Yi,Yunyun Dong
The conversion of CO 2 to CO via the reverse water-gas shift (RWGS) reaction is crucial for CO 2 hydrogenation. However, conventional thermal catalysis relies heavily on fossil fuels and fails to achieve carbon neutrality. Photothermal catalysis offers a promising alternative pathway for efficient CO 2 conversion. Yet, enhancing CO 2 adsorption and activation for high activity and selectivity remains a challenge in RWGS reactions. In this article, a series of Ni supported catalysts (Ni/MgO -x , where x = 1.2, 2.4, and 3.6) with abundant oxygen vacancies (Ovs) were prepared using a simple combustion method with magnesium acetate (Mg(CH 3 COO) 2 ) and urea as precursors. The results indicate that Ni/MgO -x catalysts with higher Ovs concentrations exhibit enhanced efficiency compared to Ni/MgO catalysts. The optimized catalyst achieved a high CO yield rate (12 mmol g −1 h −1 ), which was 36 times greater than that of the control catalyst under 1 W cm −1 lamp irradiation at 300 °C. Detailed characterization and density functional theory (DFT) results revealed an HCOO* reaction pathway and demonstrated the role of excess Ovs in CO 2 adsorption, activation, and reduction of the RWGS reaction activation energy. This research explores novel approaches for RWGS based on MgO supports for efficient CO 2 adsorption and activation, coupled with low-temperature synergistic photothermal effects.
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ENERGY & FUELS
·
2026
·
IF 6
Boya Hao,Gang Hou,Zewei Liu,Zeyuan Lei,Chongyi Wang,Bofeng Zhang,RongRong Zhang,Xingjie Wang,Jiafei Lyu,Guozhu Liu
The growing demand for sustainable aviation fuel (SAF) makes extending the carbon chain from ethanol a strategy well worth pursuing. Herein, a series of Ni/MgO@C catalysts derived from Ni/Mg bimetallic metal–organic frameworks (MOFs) was evaluated for the Guerbet coupling of ethanol to higher alcohols within the alcohol-to-jet (ATJ) strategy. Owing to the isolated metal nodes in the periodic framework, highly dispersed Ni species on the magnesium-based solid supports with abundant basic sites have been accessed. The catalyst with a Ni/Mg molar ratio of 0.13 achieved a higher alcohol yield of 55.5% at 88.4% ethanol conversion under 2 MPa N2 at 240 °C for 10 h. Upon extending the reaction to 24 h, C8–C16+ alcohols accounted for 41.4% of the alcohol product pool. Comprehensive catalyst characterization combined with theoretical calculations revealed that the involvement of Ni species can accelerate the dehydrogenation step, while an appropriate Niδ+/Ni0 ratio can be critical for efficient carbon chain elongation by promoting alcohol dehydrogenation to aldehyde and simultaneously suppressing their deep decomposition through weakened interaction with the catalyst surface.
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高影响因子
APPLIED ENERGY
·
2019
·
IF 8.426
Haowei Li,Hongwei Ma,Weijie Zhao,Xuehui Li,Jinxing Long
Biofuel production from renewable resources is becoming an increasingly attractive option given the depletion of fossil fuels and the environmental problems caused by the excessive use of unsustainable energy resources. In this study, an efficient approach is provided for high-quality oxygen-containing fuel production from renewable lignin bio-oil. The results demonstrate that the calcination temperature has a remarkable effect on the catalyst structure, surface Ni content and physico-chemical properties of the Ni/MgO material, all of which result in significantly different performances in the upgrading of lignin bio-oil. At 160 °C for 4 h and 3 MPa of hydrogen, a 98% lignin bio-oil model compound of guaiacol is converted with 97% cyclohexanol selectivity in the presence of 15% Ni/MgO-850. Furthermore, the optimized catalytic system is reusable and shows good catalytic performance in the upgrading of both light and heavy lignin bio-oils, indicating that it is a promising strategy for renewable lignocellulosic biomass valorization.
研究领域:
能源化学
·
催化材料科学
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