JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2025
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IF 6.2
Wanchen Zhu,Zhongyang Luo,Feiting Miao,Longyi Liu
Biomass hydropyrolysis vapor upgrading (HPVU) is a promising approach for biofuel production, where metallic catalysts play a key role in oxygen removal and aromatic hydrocarbon formation. In this study, Pd/HZSM-5 and Mo/γAl 2 O 3 catalysts were prepared and utilized individually or in combination to investigate their effects on poplar HPVU in a continuous-flow reactor. Meanwhile, the influence of upgrading temperature on hydrodeoxygenation (HDO) reactions was studied. At an upgrading temperature of 400 ℃, combination of Pd/HZSM-5 and Mo/γAl₂O₃ resulted in an organic phase yield of 9.19 wt%. The mass yield and selectivity of aromatic hydrocarbons reached 8.13 wt% and 93.4 %, respectively, with selectivity of C8 + monocyclic aromatic hydrocarbons accounting for 56.7 %. The overall mass balance was 96.2 %. The presence of Pd promotes hydrogenation and hydroalkylation reactions, while Mo/γAl₂O₃ enhances deoxygenation. Additionally, its mesoporous structure facilitates reactant diffusion. The density functional theory calculations confirmed that Pd could efficiently activate H 2 and thus provide hydrogen radicals for HDO on Mo/γAl₂O₃ surface, which revealed the synergistic effect of these two catalysts. This study highlights that noble-metal catalyst aided by oxophilic metal catalyst can make a significant contribution to biomass HPVU.
研究领域:
能源与催化
·
化学工程
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DOI
高影响因子
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
·
2022
·Vol. 26
·期 2
·e202201275
·
IF 3.261
Cai-Yan Zhang,Ke Cao,Han-Bo Yang,Linhai Jiang,Bo Li,Junxiao Yang
The Cu(OTf) 2 /NBS promoted cyclization of 1-cinnamyl alcohol- o -carboranes for synthesis of o -carborane substituted oxetanes has been developed. A series of substituted oxetanes has been synthesized with moderate to good yields, which would be an important synthon for design novel reactions in oxetane chemistry as well as carborane chemistry. Graphical Cu(OTf) 2 /NBS promoted cyclization of 1-cinnamyl alcohol- o -carboranes offers a novel synthon of o -carborane substituted oxetane.
研究领域:
有机化学
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硼化学
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药物化学
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合成方法学
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高影响因子
FOOD HYDROCOLLOIDS
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2025
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IF 12.4
Sha Ao,Le Li,Yan Li,Bin Li,Shilin Liu
The stabilization of double emulsions (e.g., oil-in-water-in-oil or water-in-oil-in-water emulsions) remains a research challenge due to their simultaneous possession of two distinct oil-water interfaces. In this study, a novel oil-in-water-in-oil (O/W/O) double emulsion was constructed utilizing a beeswax-soybean oil oleogel as the continuous phase, while a gelatin-stabilized oil-in-water (O/W) emulsion served as the dispersed phase. The effects of gelatin concentration, beeswax content, and the volume fraction of the dispersed phase on the stability, microstructure, and rheological properties of the O/W/O double emulsions were investigated. The results indicated that the emulsion droplet size reduced from 10.08 ± 2.29 μm to 6.92 ± 1.82 μm by elevating the gelatin concentration. In addition, the solidification of the O/W/O double emulsion into an oil-solid-solid interface structure induced by thermal treatment and subsequent storage at room temperature, which resulted in improved stability and modulus. Following freeze-thaw cycles, the stability of the double emulsions remained unaffected by varying concentrations of beeswax (ranging from 2 to 8 wt%). Destabilization was observed only when the volume fraction of the O/W emulsion reached 55 % v/v, suggesting that double emulsions with lower internal dispersed-phase contents (e.g., 10 % v/v and 25 % v/v) exhibited superior freeze-thaw stability. These findings highlight the potential of this innovative formulation for producing interfacially stable O/W/O double emulsions with enhanced physical properties, thereby offering a promising strategy for applications that necessitate long-term stability and structural integrity.
研究领域:
食品科学
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胶体化学
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材料科学
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生物医学工程
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药物传递
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Pengjia Sun,Jian Xiong,Ping Sun,Yingsen Fang,Hongxia Liu,Hui Liu,Bitao Xiong,Hui Wang,Xing'ao Li
Metal-doped g-C 3 N 4 materials have been extensively investigated and utilized as catalysts in the domain of wastewater treatment. In this study, additional O was introduced in Mn-doped g-C 3 N 4 (MCN) to synthesize Mn/O co-doped material (MOCN), and a new non-radical oxidation system of periodate (PI) activation with MOCN was established for degradation of pollutants. The results indicated that additional O doping can enhance the catalytic performance of MOCN. This was primarily demonstrated by the 3.5-fold increase in the degradation rate ( k ) of sulfadiazine (SDZ) by MOCN/PI system compared to MCN/PI one. Simultaneously, density functional theory (DFT) calculations have revealed that MOCN material exhibit a higher affinity for adsorbing PI (adsorption energy E ads = −4.992 eV), resulting in an elongation of the I-O bond length ( l I-O = 1.874 Å) and facilitating bond cleavage of PI to generate reactive active species (ROS). The reaction process was confirmed to be primarily driven by non-radical singlet oxygen ( 1 O 2 ), as demonstrated by electron paramagnetic resonance (EPR) and free radical quenching experiments. In addition, possible degradation pathways of SDZ were proposed based on the identified intermediate products and the calculated Fukui constants. The MOCN/PI catalytic system was highly efficient and environmentally friendly, with great potential for development in sewage treatment.
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高影响因子
Food Bioscience
·
2023
·
IF 5.2
Pengjing Zhang,Yuanda Sun,Yitong Hou,Haitao Wang,Mingqian Tan
Double emulsions (DEs), one of the most promising dispersion systems, have attracted much attention in the food industry. However, instability and the need for synthetic surfactants hinder the application of DEs. The development of clean-label DEs with good stability remains a challenge. Herein, novel DE gels (DEGs) with water-in-oil-in-water morphology were developed by combining multiple gelation and emulsification processes, which can stabilize the dispersion system without the synthetic surfactants used in conventional emulsions. Gelatin and beeswax were used to gelatinize the internal aqueous and oil phases respectively. Sodium caseinate acted as the external aqueous phase emulsifier, while a blend of gellan gum (GG) and sodium alginate (SA) was introduced to create DEGs. The networks formed by SA and GG in the water phase inhibited the movement of droplets in the emulsions and improved their stability. The DEGs can withstand up to five freeze-thaw cycles and at least 100 d of storage. In addition, the textural properties of DEGs were characterized and the results suggested that DEGs could be used as a cheese simulant. DEGs could be used as carriers for the co-delivery of phycocyanin and astaxanthin . Their encapsulation efficiency was greater than 90%. Furthermore, in vitro digestion showed that DEGs significantly improved the bioavailability of astaxanthin and phycocyanin, which increased from 18.5 ± 0.15% and 16.3 ± 0.45% to 43.2 ± 0.35% and 41.6 ± 0.5%, respectively. In conclusion, we have demonstrated a novel strategy for the preparation of clean-label DEGs, which could be used as a carrier for the co-delivery of hydrophilic and hydrophobic substances.
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高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Qiang-Qiang Ma,Peng Zhou,Yizhen Liu,Zuowei Xie
Transition metal catalyzed selective cage B–H functionalization of carboranes has made significant progress in recent years, giving rise to the efficient synthesis of a large variety of cage B-functionalized carboranes including alkenylation, arylation, alkynylation, borylation, hydroxylation, acyloxylation, amination, and halogenation. However, the mechanisms of these catalytic B–X coupling reactions are not well understood. Herein, we describe the isolation and characterization of the catalytically relevant o-carborane based palladium(II) metallacycle, disclosing the details of Pd-catalyzed B–H functionalization of o-carboranes. As a result, highly selective catalytic B(3,6)-dihalogenation, -dimethylation, and -diarylation of o-carboranes have been achieved.
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Su Wang,Qifang Sun,Chen Li,Dongge Wang,Yue Ma,Hongzhou Zhang,Xixi Shi,Lianqi Zhang,Dawei Song
Given the high combustion or explosion potential of liquid electrolyte, polymer electrolytes have attracted intensive attention due to high safety, compatible interface and flexible processability. However, the related low ionic mobility remains an issue for related wide application. Herein, a crosslinked polymer electrolyte (abbreviated as PMEP) comprising abundant oxygen-contained groups (C-O-C/C=O) is developed. With the crosslinking agent of ethoxylated trimethylolpropane triacrylate (ETPTA), a high transference number ( t Li + =0.69) is obtained since C-O/C=O are conducive to the transfer of Li ions. Specifically, C=O group exists in individual monomers in order to be applicable to high voltage cathode, therefore, a criss-cross network containing abundant sites conducive to ion transport is constructed and rapid ion transfer as well as enhanced mechanical strength can be realized even in high potential system. With the coordination effect of C-O and C=O, PMEP exhibits rapid Li ion transfer and a wide electrochemical stability window of 5.1 V. As for Li//Li symmetrical cell, a stable voltage profile with slight polarization of 60 mV is displayed for over 550 h at 1 mA cm −2 . After assembled with LiNi 0.8 Co 0.15 Al 0.05 O 2 cathode, a high discharge specific capacity of 190.6 mAh g −1 is delivered and the capacity retention reaches 86 % at 0.1C for 100 cycles. This work provides a promising method for designing high-performance polymer electrolytes for lithium metal batteries.
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高影响因子
FLAVOUR AND FRAGRANCE JOURNAL
·
2025
·
IF 2
Zhuoxuan Han,Shuqi Wang,Haitao Chen,Jie Sun,Ning Zhang,Huiying Zhang
As a traditional fermented soybean product in China, douchi is rich in diversity and varies from place to place. Because of the significance in food culture, the douchi from Sichuan, Hunan, and Guizhou are quite typical and distinctive. By analysing the volatile components of these three types of douchi, we can not only deconstruct the cause of aroma formation, but also lay the foundation for flavour adjustment. In this study, the key aroma-active compounds of the three types of douchi were identified by gas chromatography–olfactometry (GC–O) and gas chromatography–mass spectrometry (GC–MS) combined with sensory evaluation. 32 aroma compounds were identified in Tongchuan douchi (TC), and 16 of them with flavour dilution (FD) > 4 were determined. 14 substances were quantified, and 4 of them with OAV > 1. 30 aroma compounds were identified in TongRen douchi (TR), and 15 of them with flavour FD ≥ 4 were determined. 13 substances were quantified, and 11 of them with OAV > 1. 21 aroma compounds were identified in LiuYang douchi (LY), and 11 of them with FD ≥ 4 were determined, and all of them were quantified. 5 substances with OAV > 1 were determined. The sensory evaluation determined that the three types of douchi possessed sauce-like, sour, burnt, bean aroma, roasted, salty, fermented aroma, and rancid aroma.
研究领域:
食品科学
·
分析化学
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DOI
高影响因子
ChemSusChem
·
2016
·Vol. 10
·期 3
·523-532
·
IF 7.116
Haiwei Guo,Bo Zhang,Zaojuan Qi,Changzhi Li,Jianwei Ji,Tao Dai,Aiqin Wang,Tao Zhang
Graphical W 2 C activity : Non-noble metal catalyst tungsten carbide shows high activity in the selective deconstruction of various lignin feedstocks to phenolic oils, and the impact of the structure differences on the activity of tungsten carbide is well studied. Softwood lignin shows lower hydrocracking efficiency than hardwood lignin, mainly owing to the higher molecular weights and the existence of more resistant linkages. Lignins isolated from representative hardwood, softwood, and grass materials were effectively hydrocracked to aromatics catalyzed by tungsten carbide over activated carbon (W 2 C/AC). The effects of botanical species and fractionation methods on lignin structure and the activity of W 2 C/AC were studied in detail. Gas permeation chromatography (GPC), FTIR, elemental analysis, and 2 D HSQC NMR showed that all the extracted samples shared the basic skeleton of lignin, whereas the fractionation method significantly affected the structure. The organosolv process provided lignin with a structure more similar to the native lignin, which was labile to be depolymerized by W 2 C/AC. Softwood lignins (i.e., spruce and pine) possessed higher molecular weights than hardwood lignins (i.e., poplar and basswood); whereas corn stalk lignin that has noncanonical subunits and exhibited the lowest molecular weight owing to its shorter growth period. β-O-4 bonds were the major linkages in all lignin samples, whereas softwood lignins contained more resistant linkages of β-5 and less β-β than corn stalk and hardwood lignins; as a result, lowest hydrocracking efficiency was obtained in softwood lignins, followed by corn stalk and hardwood lignins. 2 D HSQC NMR spectra of lignin and the liquid oil as well as the solid residue showed that W 2 C/AC exhibited high activity not only in β-O-4 cleavage, but also in deconstruction of other ether linkages between aromatic units, so that high yield of liquid oil was obtained from lignin.
研究领域:
化学工程
·
生物质能
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2017
·
IF 4.849
Jian Cheng,Jun Sun,Jiekuan Yan,Song Yang,Pengcheng Zheng,Zhichao Jin,Yonggui Robin Chi
The metal-free catalytic functionalization of aromatic sp2-carbons and benzylic sp3-carbons remains challenging. Here we report a carbene-catalyzed functionalization of the 3-methyl sp3-carbon attached to 2-formyl-indoles. The reaction proceeds through an NHC-bound o-quinodimethane as the key intermediate generated from 2-formyl-3-methylindoles under oxidative conditions. Reactive ketones are found to be effective substrates to produce substituted hydropyrano[3,4-b]indoles in good to excellent yields.
研究领域:
有机化学
·
合成化学
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DOI
高影响因子
Journal of Environmental Sciences
·
2025
·
IF 6.3
Likai Wang,Donglin Liu
The degradation of persistent organic pollutants like 4-chlorophenol (4-CP) remains a critical challenge in wastewater treatment. Transition-metal sulfides have emerged as promising Fenton-like catalysts owing to their tunable electronic structures and abundant redox-active sites. Herein, we report a highly efficient Fenton-like system using ternary copper-iron sulfide (Cu x Fe y S z ) nanocatalysts for 4-CP degradation. Three Cu x Fe y S z phases—CuFe₂S₃, CuFeS₂, and Cu₅FeS₄—were synthesized and systematically evaluated, with CuFe₂S₃ demonstrating superior catalytic activity, achieving complete degradation of 20 mg/L 4-CP within 7 min using 5 mmol/L H₂O₂. Mechanistic studies reveal that sulfur vacancies in CuFe₂S₃ serve as key features, enhancing H₂O₂ adsorption and activation, as evidenced by in situ Raman spectroscopy. Comparative studies with CuFe₂S₃ analogues (0.7-CuFe₂S₃, 0.9-CuFe₂S₃, Fe₃S₄, and Cu₈S₅) confirm the unique catalytic efficiency of stoichiometric CuFe₂S₃, attributed to its optimal electronic structure and vacancy density. This work not only presents CuFe₂S₃ as a cost-effective and high-performance Fenton-like catalyst but also lays a solid foundation for the application of naturally occurring copper-iron sulfide minerals in wastewater treatment.
研究领域:
环境化学
·
催化
·
材料科学
·
水处理技术
·
高级氧化工艺
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高影响因子
Journal of the Iranian Chemical Society
·
2026
·Vol. 23
·期 1
·33
·
IF 2.4
Yan Jiaqi,Fu Weiwen,You Kuiyi,Zhao Fangfang,Luo He’an
A mild and efficient method for the solvent-free catalytic nitration of o-xylene (OX) employing silicon sulfonic acid (SSA) as a catalyst and NO 2 as a clean nitrating agent, leads to high selectivity for 4-nitro-o-xylene (4-NOX). Under optimal conditions, a 64.6% selectivity for 4-NOX and a 46.7% conversion of OX were achieved. The results showed that the enhanced OX conversion and target product selectivity were attributed to the synergistic catalysis of the combination of the SSA catalyst and the NO 2 –O 2 system. The characterization results showed that the immobilized SSA, which is not only simple and economical to prepare but also exhibits excellent nitration activity, was effectively synthesized via the chemical bonding method. The highly dispersed sulfonic acid groups were covalently anchored to the surface of the silicon acid (SA), thereby enriching acid sites and stabilizing the catalytic performance. Additionally, a possible reaction mechanism for nitrating OX with NO 2 –O 2 over the SSA catalyst was proposed. Compared with the traditional method, this study promotes the selectivity of the target product while reducing acidic wastewater streams, indicating potential application prospects.
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高影响因子
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