JOURNAL OF MOLECULAR LIQUIDS
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2021
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IF 6.165
Jing Fan,Liangliang Fan,Shuangshuo Liu,Fenhong Song
Globally, biofuel is considered as the largest renewable energy source to substitute the petrochemical fuel and it is thus received a great amount of attention from both developed countries and developing countries. Among all the biofuels, biodiesel is strongly recommended as a promising alternative fuel for traditional internal combustion engines. Thermal conductivity is an essential transport property of fuel, and is vital in the flow and heat transfer process. Therefore, it is necessary to conduct the research associated with fuel’s thermal conductivity . In this work, four binary fuel mixtures containing biodiesel components methyl caprate and ethyl caprate with n-undecane and n-tridecane were prepared respectively, and the liquid thermal conductivity of which were measured by the transient hot wire method system. The measurement was conducted at the temperature from 292 K to 362 K at atmospheric pressure. The experimental data reported here have an uncertainty of less than 2%. In addition, a correlation about the relationship between the liquid thermal conductivity with temperature and the esters’ concentration in different fuel blends has been correlated.
研究领域:
燃料化学
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热物理性质
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可再生能源
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生物燃料
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传热传质
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高影响因子
PEST MANAGEMENT SCIENCE
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2026
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IF 4.2
Yitian Duan,Xuelai Li,Shichang Zhang,Xiaoguo Jiao,Yu Peng,Yueli Yun,Yao Zhao
BACKGROUND The ladybird Harmonia axyridis is an important predatory natural enemy, and during both predation and oviposition it encounters interference from the black garden ant Lasius niger , as ants aggressively defend aphid colonies and thereby restrict ladybirds' access to suitable foraging and oviposition sites. However, the role of L. niger cuticular hydrocarbons (CHCs) in mediating the behavioural responses of H. axyridis remains unclear. RESULTS Our results show that H. axyridis exhibits significant avoidance behaviour toward both L. niger and its CHCs. Chemical and electrophysiological analyses identified undecane as an electroantennographic detection (EAD)-active CHC component that elicited avoidance responses in behavioural assays. Behavioural assays showed that undecane significantly reduced both the predation of the aphid Aphis gossypii and oviposition by H. axyridis . CONCLUSION This study provides evidence that H. axyridis avoids the CHCs of L. niger , particularly undecane, and that this behaviour modulates its feeding and egg-laying activities. These findings advance our understanding of chemically mediated interactions between natural enemies and competitors in multitrophic systems and provide a basis for future studies evaluating how ant-derived chemical cues may influence biological control under more realistic field conditions. © 2026 Society of Chemical Industry.
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Metabolic Engineering Communications
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2022
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IF 0
Yushi Liu,Wan-Qiu Liu,Shuhui Huang,Huiling Xu,Haofan Lu,Changzhu Wu,Jian Li
Fatty acid-derived products such as alkanes, fatty aldehydes, and fatty alcohols have many applications in the chemical industry. These products are predominately produced from fossil resources, but their production processes are often not environmentally friendly. While microbes like Escherichia coli have been engineered to convert fatty acids to corresponding products, the design and optimization of metabolic pathways in cells for high productivity is challenging due to low mass transfer, heavy metabolic burden, and intermediate/product toxicity. Here, we describe an E. coli -based cell-free protein synthesis (CFPS) platform for in vitro conversion of long-chain fatty acids to value-added chemicals with product selectivity, which can also avoid the above issues when using microbial production systems. We achieve the selective biotransformation by cell-free expression of different enzymes and the use of different conditions (e.g., light and heating) to drive the biocatalysis toward different final products. Specifically, in response to blue light, cell-free expressed fatty acid photodecarboxylase (CvFAP, a photoenzyme) was able to convert fatty acids to alkanes with approximately 90% conversion. When the expressed enzyme was switched to carboxylic acid reductase (CAR), fatty acids were reduced to corresponding fatty aldehydes, which, however, could be further reduced to fatty alcohols by endogenous reductases in the cell-free system. By using a thermostable CAR and a heating treatment, the endogenous reductases were deactivated and fatty aldehydes could be selectively accumulated (>97% in the product mixture) without over-reduction to alcohols. Overall, our cell-free platform provides a new strategy to convert fatty acids to valuable chemicals with notable properties of operation flexibility, reaction controllability, and product selectivity.
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PubMed
JOURNAL OF CHROMATOGRAPHY A
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2022
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IF 4.601
Ruijuan Duan,Meiling Qi
This work presents the investigation of two new pentiptycene (PP)-functionalized triblock copolymers (PEPE1, PEPE2) for gas chromatographic (GC) analyses with an aim to address the separation problems toward analytes of high resemblance in properties and a wide variety of components in complex samples. Up to date, these two materials are not reported in any fields. The PEPE1 and PEPE2 columns showed close column efficiency (above 4000 plates/m) but differed in polarity, morphology and separation performance. As testified by the challenging Grob test mixture, the PEPE1 column exhibited comprehensively higher separation capability than the PEPE2 column and the commercial reference columns. Also, the PEPE1 column achieved high-resolution performance for both apolar and polar isomers of high resemblance, such as xylenes, phenols and anilines. Moreover, it displayed high inertness towards carboxylic acids and excellent separation repeatability and reproducibility tested by the aniline isomers with the RSD values in the range of 0.01–0.04% for run-to-run, 0.09–0.13% for day-to-day and 1.2–2.0% for column-to-column, respectively. Its application to GC–MS analysis of the essential oil from tea flowers demonstrated its advantageous separation performance towards a wide range of components and proved its feasibility for practical analyses of complex samples.
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高影响因子
ACS Omega
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2022
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IF 4.132
Wei Fu,Linxin Xu,Qiwen Yu,Jiajia Fang,Guohua Zhao,Yi Li,Chenying Pan,Hao Dong,Di Wang,Haiyan Ren,Yi Guo,Qingjun Liu,Jun Liu,Xing Chen
Background: Currently, Parkinson’s disease (PD) diagnosis is mainly based on medical history and physical examination, and there is no objective and consistent basis. By the time of diagnosis, the disease would have progressed to the middle and late stages. Pilot studies have shown that a unique smell was present in the skin sebum of PD patients. This increases the possibility of a noninvasive diagnosis of PD using an odor profile. Methods: Fast gas chromatography (GC) combined with a surface acoustic wave sensor with embedded machine learning (ML) algorithms was proposed to establish an artificial intelligent olfactory (AIO) system for the diagnosis of Parkinson’s through smell. Sebum samples of 43 PD patients and 44 healthy controls (HCs) from Fourth Affiliated Hospital of Zhejiang University School of Medicine, China, were smelled by the AIO system. Univariate and multivariate methods were used to identify the significant volatile organic compound (VOC) features in the chromatograms. ML algorithms, including support vector machine, random forest (RF), k nearest neighbor (KNN), AdaBoost (AB), and Naive Bayes (NB), were used to distinguish PD patients from HC based on the VOC peaks in the chromatograms of sebum samples. Results: VOC peaks with average retention times of 5.7, 6.0, and 10.6 s, respectively, corresponding to octanal, hexyl acetate, and perillic aldehyde, were significantly different in PD and HC. The accuracy of the classification based on the significant features was 70.8%. Based on the odor profile, the classification had the highest accuracy and F1 of the five models with 0.855 from NB and 0.846 from AB, respectively, in the process of model establishing. The highest specificity and sensitivity of the five classifiers were 91.6% from NB and 91.7% from RF and KNN, respectively, in the evaluating set. Conclusions: The proposed AIO system can be used to diagnose PD through the odor profile of sebum. Using the AIO system is helpful for the screening and diagnosis of PD and is conducive to further tracking and frequent monitoring of the PD treatment process.
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PubMed
高影响因子
FUEL
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2022
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IF 8.035
Lin Fu,Zhaoxin Liu,Xin Li,Yongfei Li,Houyi Yang,Yuejin Liu
Ni-catalysts usually experienced quick deactivation during bio-lipids deoxygenation due to metal sintering and coke. Here we prepared a series of Ni/CeO 2 -Al 2 O 3 catalysts, denoted as NiCeAl-EISA, NiCeAl-WI and NiCeAl-CP, prepared by evaporation-induced self-assembly (EISA), wetness impregnation (WI), co-precipitation (CP) methods, respectively, aiming at tuning metal-support interaction (MSI) in Ni/CeO 2 -Al 2 O 3 catalysts for the deoxygenation of bio-lipids to hydrocarbons. The porosity and surface properties of the catalysts are systematically studied by BET, XRD, H 2 -TPR, HR-TEM, FT-IR, O 2 -TPD, NH 3 -TPD, RPR, Py-FTIR, XPS and in situ XPS. The NiCeAl-EISA catalyst afforded 92.2% n-C 11 yield at full methyl laurate conversion, and efficiently deoxygenated different FAMEs, yielding corresponding alkanes yields of 97.8% (n-C 9 ), 96.4% (n-C 13 ), 94.3% (n-C 15 ) and 92.9% (n-C 17 ). The TOFs were calculated as 426–719, 241–343 and 148–243 h −1 for NiCeAl-EISA, NiCeAl-WI and NiCeAl-CP catalysts, respectively. Jatropha oil and waste cooking oil were also converted into liquid alkanes (C 13-18 ) with a total yield of 95.4% and 93.7%, respectively. The NiCeAl-EISA catalyst exhibits superior catalytic activity and remained stable with 92.2% n-C 11 yield after 11 consecutive runs, as compared with NiCeAl-WI and NiCeAl-CP. This significant increase in catalyst activity and stability is closely correlated with the tunable SMSI of Ni/CeO 2 -Al 2 O 3 catalyst, which facilely forms abundant oxygen vacancies and interfacial sites (Ni δ+ -O V -CeO x ). This suppresses strong Ni-Al interaction, thus exposing more active and robust Ni sites to promote R-COOH → R-CHO reduction to produce more alkanes. The weakened Ni-Al interaction also reduces the strong acidity and consequently inhibits the coke formation and simultaneously restrains C–C bond cleavage of hydrocarbons.
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Journal of Cleaner Production
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2022
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IF 11.072
Ma Wenjing,Dai Shanshan,Li Xiaojiang,Hongsheng Lu
Oily wastes are easily generated in many processes of exploitation, solvent extraction is the common method for treating the oily waste. However, traditional solvent extractions are difficult to recycle the solvent, and oil is difficult to separated. As a low-volatility solvent, ionic liquid is simple in synthesis, low in cost, so it has good application prospect. In this work, the sustainable separation of oil from oily waste was implemented by using CO 2 -switchable ionic liquids. On the basis of solvent extraction, ionic liquids can reduced losses and costs. The CO 2 -switchable ionic liquids were prepared by poly (propylene glycol) bis(2-aminopropyl ether) D-230 and fatty acids with low volatility at the mole ratio of 1:2. Upon the alternate bubbling CO 2 and N 2, ionic liquids could be transformed alternately from water-miscible state to water-immiscible state. The water-immiscible state was bi-phasic system containing hydrophobic fatty acids and ammonium bicarbonate solution by bubbling CO 2 . Based on the bi-phasic system, the oil (kerosene, paraffin oil and crude oil) could be mixed with fatty acids, and were separated from fatty acids in the hydrophilic state upon N 2 , where the recovery rate of oil was more than 97% and fatty acids was not residual in recovered oil. Treating oily waste, the oil could be extracted from oily waste by the bi-phasic system. The ionic liquids were reused and the oil was separated by bubbling N 2 without extra additives, where the recovery rate of oil from oily waste was more than 85.57%. Due to the simplified process and negligible solvent loss, the economic benefit of recovering per barrel crude oil reached 76.7% of the price of crude oil. Compared with the existing technology , this sustainable separation is simpler, more economical and more environmentally friendly. Hence, it is expected that this sustainable separation based on CO 2 -switchable ionic liquids will meet the development of green separation with low-energy consumption.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2021
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IF 2.694
Jing Fan,Peng Liu,Qinglong Meng,Chang Gao,Fenhong Song
Recently, biodiesel has received tremendous attention from a lot of scientists as a biodegradable, renewable, and high-potential fuel, which could be used directly or blended with diesel in internal combustion engines. The adequate thermophysics properties of fuel are required to model the process of fuel spray, atomization, and combustion accurately. In this work, five fuel blends containing methyl myristate and n-alkane (N-decane, N-undecane, N-dodecane, N-tridecane, and N-tetradecane) were prepared, and an important transport property—liquid thermal conductivity—was measured through an experimental system constructed based on transient hot-wire theory. The measurement was conducted at temperatures ranging from 292 to 362 K under a pressure of 0.1 MPa with the weight fraction of methyl myristate being nearly 0.2000, 0.4000, 0.6000, and 0.8000 (by weight) in the binary mixtures. Furthermore, the relationship between the experiment results and temperature and mass fraction of methyl myristate was correlated as a polynomial function. The uncertainty of the experiment system is smaller than ±2.0%.
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BIOMASS & BIOENERGY
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2020
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IF 3.551
Zhoutian Ding,Tong Zhao,Qing Zhu,Shengyun Liao,Liangmin Ning,Yadong Bi,Hui Chen
The key technical issues for establishing an economical and advanced deoxygenation process of vegetable oil for producting the diesel-like hydrocarbons are to develop the low-cost non-sulfided heterogeneous catalytic systems with good performance. Herein, we report two facile strategies for preparing Co-based catalysts in an effort to explore the highly efficient heterogeneous catalysts for the deoxygenation of laurate ester. Interestingly, the deoxygenation paths can be regulated by altering the synthesized methods of the Co-based catalysts. For example, the Co-MOF-700 catalyst prepared via pyrolysis of one cobalt metal-organic framework (Co-MOF: [Co(tia)(H 2 O) 2 ] n , tia 2− = 5-(1 H -1,2,3-triazol-1-yl) isophthalate) at 700 °C under N 2 atmosphere for 4 h can orient the catalytic hydrogenation of laurate ester towards decarboxylation/decarbonylation with full conversion and 67.6% selectivity of undecane. While, Co/ZSM-5 synthesized through impregnation-reduction method can promote transformation of methyl laurate to dodecane via hydrodeoxygenation path, in which the conversion and selectivity can be up to 100% and79.12%, respectively.
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ANALYTICA CHIMICA ACTA
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2020
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IF 5.977
Yueru Shi,Luyi Chen,Junlong Huang,Zhiwei Ma,Qingkun Hu,Fang Zhu,Juan Zheng,Gangfeng Ouyang
Binders are significant components for the preparation of solid-phase microextraction (SPME) fibers. However, little attention has been paid to the effect of different binders. Considering their diverse properties, in this work, we select three kinds of commonly used binders including polydimethylsiloxane (PDMS), polyacrylonitrile (PAN) and Nafion, as well as introduce a new binder of poly (vinylidene fluoride) (PVDF) to synthetically study the influence of binders. By using the commercial active carbons (ACs) with different binders, four SPME fibers with uniform morphologies and comparative thicknesses ( i.e. , ACs-PDMS-coated, ACs-PAN-coated, ACs-Nafion-coated and ACs-PVDF-coated fibers) have been prepared successfully. The effect of binders on the pore structure of ACs is firstly investigated. It is found that PDMS and PAN would cause pore blocking, and the specific surface area of ACs coatings decreases from 1362 m 2 g −1 to 280 and 196 m 2 g −1 , respectively. While the specific surface area of ACs-PVDF composite remains 940 m 2 g −1 . Based on SPME, the influences of acid/alkali, high temperature and matrix towards different fibers are further systematically surveyed. Finally, the enrichment performance of prepared fibers towards various organic pollutants is preliminarily discussed. The comparison results show that PVDF demonstrates outstanding stability in all aspects. Therefore, PVDF might be an excellent candidate for the preparation of SPME fiber. Moreover, all obtained results are expected to provide the reference value for the further development of novel SPME fibers.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2020
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IF 2.369
Xiaomei Qin,Yapei Chen,Shihao Yang,Xiaoyun Qin,Jianbo Zhao,Wenjun Fang
Measurements on densities, viscosities, and refractive indices at atmospheric pressure for binary mixtures of 1,3-dimethyladamantane (1,3-DMA), 1,3,5-trimethyladamantane (1,3,5-TMA), and 1-ethyladamantane (1-EA) with n-nonane or n-undecane are carried out over the whole composition range at temperatures T = 293.15–343.15 K and atmospheric pressure. The excess molar volume (VmE), deviation in viscosity (Δη), deviation in refractive index (ΔnD), and deviation in molar refraction (ΔR) for the six mixtures are calculated and then fitted to the Redlich–Kister polynomial. The VmE values are all negative over the entire range of mole fractions and decrease with increasing temperature for the six binary systems. The absolute values of Δη for the mixtures decrease obviously with increasing temperature. The ΔnD values with the volume fraction for the six systems are all positive over the entire composition range. Density, viscosities, and refractive index of the six systems are correlated by the Jouyban–Acree model. The experimental results could be useful for the development of high-energy-density hydrocarbon fuels.
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Nature Catalysis
·
2020
·Vol. 3
·期 2
·170-178
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IF 30.471
Huang Zhipeng,Zhao Zhitong,Zhang Chaofeng,Lu Jianmin,Liu Huifang,Luo Nengchao,Zhang Jian,Wang Feng
The decarboxylation of bio-derived fatty acids provides a sustainable pathway for the production of alkane products under mild conditions; however, products are generally obtained in low selectivity due to the uncontrollable reactivity of radical intermediates. Here we demonstrate that photogenerated radicals can be rapidly terminated by surface hydrogen species during photocatalytic decarboxylation of fatty acids on a hydrogen-rich surface that is constructed by the interactions between H 2 and Pt/TiO 2 catalyst, thereby greatly inhibiting oligomerization; C n – 1 alkanes can therefore be obtained from bio-derived C 12 –C 18 fatty acids in high yields (≥90%) under mild conditions (30 °C, H 2 pressure ≤0.2 MPa) and 365 nm light-emitting dode irradiation. Industrial low-value fatty acid mixtures (namely, soybean and tall oil fatty acids) can be transformed into alkane products in high yields (up to 95%). Our research introduces an efficient biomass-upgrading approach that is enabled by subtle control of the radical intermediate conversion on a heterogeneous surface.
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危险品化学品经营许可证（带存储）