INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Zhi-Cong Wang,Pei-Gao Duan,Xiao-Jie Liu,Feng Wang,Yu-Ping Xu
The low-boiling-point distillate (LBD) via vacuum distillation of biocrude produced from hydrothermal liquefaction of soybean straw was hydrotreated to produce trace-sulfur liquid fuel. The effects of five hydrogen donor solvents (HDSs), including cyclohexene, cyclohexane, decahydronaphthalene, tetrahydronaphthalene, and Indane, on heteroatom removal efficiency were examined at 350 °C for 2 h with 6 MPa H2 added and 5 wt %(Pt/C)/feed. The LBD to HDS mass ratio was 1:1. HDSs not only could reduce the production of solid and gas and increase the yield of upgraded oil but also could favor denitrogenation, desulfurization, and deoxygenation of the upgraded oil. Among the HDSs examined, decahydronaphthalene showed the best performance for denitrogenation, and tetrahydronaphthalene was the most suitable HDS for deoxygenation and desulfurization. By employing a decahydronaphthalene and tetrahydronaphthalene mixture (w/w, 1:1) as the reaction medium, the effects of temperature (300–450 °C), time (1–6 h), H2 pressure (0.1–10 MPa), and Pt/C loading (0–20 wt %) on the product yields and quality of the upgraded oil produced from hydrotreating the LBD were examined. The upgraded oil was the dominant product fraction under all tested reaction conditions and varied between 76.7 and 87.3 wt %. The HDS mainly acted as a hydrogen transfer agent in the LBD hydrotreatment process, during which the HDS provided the hydrogen for the hydrogenation reaction, and this consumed hydrogen was resaturated by the external hydrogen source. A more positive synergistic effect was observed for the removal of N, O, and S when using the decahydronaphthalene and tetrahydronaphthalene mixture than when using decahydronaphthalene or tetrahydronaphthalene alone. N was the most difficult heteroatom to remove, followed by O and S. Catalyst loading was the most influential factor affecting the N, O, and S removal efficiencies. Under optimal reaction conditions, 93% of N, 95% of O, and 99% of S in the LBD and HDS blend were removed, which corresponded to contents of 0.05 wt %, 0.42 wt %, and 21 ppm in the upgraded oil, respectively. The equilibrium restrictions on denitrogenation, deoxygenation, and desulfurization were essential factors affecting the removal efficiencies of heteroatoms.
研究领域:
能源生物学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Jian Wei,Yucui Hou,Tianqi Huang,Aohua Zheng,Shuhang Ren,Weize Wu
Identifying the source of products in lignin hydro-liquefaction oil is crucial for assessing the lignin conversion efficiency. The utilization of hydrogen donor solvents (HDSs) complicates the determination of whether polycyclic aromatic hydrocarbons (PAHs) derive from lignin or HDS. Thus, identifying the source of PAHs in the oil can improve our understanding of lignin structures and enhance its utilization. To address this challenge, 1,2,3,4-tetrahydroquinoline (THQ) was used as an HDS to trace products within the oil. The results showed that (1) lignin could be completely liquefied in THQ under optimal conditions: a THQ/lignin mass ratio of 0.5, a reaction temperature of 450 °C, an initial H2 pressure of 8 MPa, a reaction time of 4 h, and a molybdenum sulfide/lignin mass ratio of 1; (2) PAHs with 2–6 rings were identified in the oil and confirmed to derive solely from lignin through qualitative and quantitative analyses via GC–MS rather than THQ.
研究领域:
能源化学
·
环境科学
·
生物质转化
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2025
·Vol. 13
·期 4
·1110
·
IF 2.8
Shikang Zhao,Guohong Chen,Kaiqi Zheng,Shaojie Li,Jiaqi Xu,Fanan Wang,Xueping Liu,Rengui Weng
γ-Valerolactone (GVL) is a promising bio-based platform molecule with significant potential for energy applications. The production of GVL via biomass-based levulinic acid (LA) is an important reaction. To enhance the conversion and selectivity of non-precious-metal catalysts in the LA-to-GVL process and to better understand the key factors influencing this conversion, we conducted a series of experiments. In this study, supported Cu-Ni bimetallic catalysts (Cu-Ni2/Al2O3) were prepared using layered double hydroxides (LDHs) as a precursor. Compared with Cu-Ni catalysts synthesized via the conventional impregnation method, the Cu-Ni2/Al2O3catalysts exhibit higher catalytic activity and stability. The results demonstrated that efficient conversion was achieved with isopropanol as the hydrogen donor solvent, a reaction temperature of 180 °C, and a reaction time of 1 h. The yield of GVL reached nearly 90%, with a decrease of approximately only 6% after six consecutive cycles. The Cu-Ni2/Al2O3catalyst proved to be effective for converting biomass-derived LA to GVL, offering a route that not only reduces production costs and environmental impact but also enables efficient biomass-to-energy conversion.
研究领域:
催化化学
·
能源科学
·
生物质利用
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Bingyue Tang,Wenzhi Li,Xia Zhang,Baikai Zhang,Hao Zhang,Cunshuo Li
Depolymerization of Kraft lignin represents an attractive strategy to obtain alternatives to fossil fuels. In this work, via the controlled oxidation of MoS 2 precursor, an oxygen-vacancy-enriched MoO 3 was synthesized and employed to catalyze the depolymerization of Kraft lignin in a new solvent system without external H 2 gas. Systematic characterizations exemplified that the calcination temperature significantly affected the morphology and concentration of oxygen vacancy of prepared MoO 3 , and the appropriate temperature in this work was proved to be 350 °C. In the optimized hydrogen-donor solvent system that contained 20 mL 1, 4-dioxane, 20 mL isopropanol and 5 mL methanol, MoO 3 -350 catalyst gave a 87 wt% yield of petroleum ether soluble products, and the higher heating value (HHV) of liquid fuels (33.4 MJ/kg) was dramatically increased compared with the original Kraft lignin (25.23 MJ/kg). Methanol and isopropanol were analyzed to be capable of promoting the solubility of Kraft lignin and supplying hydrogen in the reaction system, respectively. Underpinned by characterizations and products analysis, the schematic representation of possible reaction pathway was given.
研究领域:
能源化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Zhi-Cong Wang,Dabo Chen,Ya-Qi Shan,Lin-Xin Lin,Pei-Gao Duan
In this study, a high-boiling point fraction (HBF, 141-220 °C) from vacuum distillation of a biocrude produced from hydrothermal liquefaction of soybean straw was hydrotreated in a hydrogen donor solvent (HDS) mixture consisting of tetralin and decalin at a mass ratio of 1:1. Effects of temperature (300–450 °C), time (1–6 h), H 2 pressure (0.01–10 MPa), and Pt/C loading (0–40 wt%) on the products distribution and properties of the treated oil were examined. Increasing the temperature, time, and catalyst loading or decreasing the H 2 pressure would reduce the treated oil yield and increase the gas and solid product yields. The presence of HDS mixture played a critical role in favoring the production of treated oil, reducing the formation of gas and solid products, and the removal of N, O, and S from the HBF. Under optimal reaction conditions, 96.3% of N, 87.1% of O, and 98.5% of S were removed from the initial feedstock. The treated oil mainly consisted of saturated hydrocarbon(∼40%, C8-C20) and aromatics(∼41%, naphthalene and benzene derivatives), which was had a comparable cetane number and better combustion characteristics relative to the market 0# diesel.
研究领域:
能源生物学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）