FLUID PHASE EQUILIBRIA
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2025
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IF 2.7
Junwei Cui,Abdul Mosaur Waseel,Qing Duan,Yike Gao,Chenyang Zhang,Tao Yang,Shengshan Bi
Hydrogen (H 2 ) solubility in liquid organic hydrogen carriers (LOHCs) is crucial for their widespread applications. This work investigates the solubility of H₂ x in two promising LOHCs: Acetophenone (APO) and 1-Methylnaphthalene (1-MN). Measurements were conducted using an isochoric saturation method within a temperature range of 293 to 363 K and pressures up to 5.8 MPa. The liquid densities ρ of APO and 1-MN, essential for characterizing H₂ solubility, were measured using a vibrating tube densitometer (DMA5000 M) at approximately 0.1 MPa. The experimental ρ for APO and 1-MN were compared with literature data and good agreement can be found. The Krichevsky-Kasarnovsky(K-K) equation was employed to correlate H₂ solubility x in APO and 1-MN, with deviations of mostly within 6 % and 10 %, respectively. Following, the behavior of H₂ solubility x concerning pressure along isothermal lines was analyzed. Finally, the thermodynamic parameter of dissolution of the two binary systems were studied. The enthalpy of dissolution is positive for all the systems, while the entropy of dissolution is negative. Under the same temperature, the Gibbs free energy of dissolution for the H₂ + APO system is smaller than that of the H₂ + 1-MN system.
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高影响因子
ANALYTICA CHIMICA ACTA
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2018
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IF 5.123
Yinhui Yang,Zhengfeng Chang,Xiaohong Yang,Meiling Qi,Jinliang Wang
Herein we report a propeller-like hexaphenylbenzene-based hydrocarbon material (denoted as BT) as the stationary phase for capillary gas chromatography (GC). The statically-coated BT capillary column showed a high column efficiency of 4340 plates m −1 and weak polarity. Owing to its unique conformation, π-electron toroidal delocalization and intrinsic microporosity , the BT stationary phase exhibited interesting selectivity for aromatic compounds over alkanes. Compared with the graphene (G) column, the BT column showed much prolonged retention and high selectivity for aromatic isomers, especially methylnaphthalenes , dimethylnaphthalenes and phenanthrene/anthracene, mainly because of its propeller-like conformation with rich intercalation effects. Moreover, it exhibited good column repeatability (intra-day, inter-day) and reproducibility (between-column) with RSD values on the retention times less than 0.08% for intra-day, 0.32% for inter-day and 3.8% for between-column, respectively. Also, it showed good potential for determination of minor isomer impurities in real samples. To the best of our knowledge, this work presents the first example of employing an neat aromatic hydrocarbon material as the GC stationary phase with high selectivity for analytes of a wide ranging polarity.
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PubMed
高影响因子
FUEL
·
2024
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IF 6.7
Fengyu Tian,Guangzheng Sun,Xianfu Zeng,Shuwen Xie,Yidi Wang,Zifan Wu,Bin Liu,Yuan Pan,Bin Dong,Yichuan Li,Yanpeng Li,Hailing Guo,Yongming Chai,Chenguang Liu
Supported and bulk phase catalysts are both extensively used in hydrogenation reactions, possess distinct strengths and limitations. Aiming to create a catalyst that combines the benefits of both, a series of NiMoW/SiO 2 catalysts were synthesized with varied metal loadings using SiO 2 supports characterized by different pore structures. The catalytic activities of these catalysts were evaluated using 1-methylnaphthalene, dibenzothiophene and quinoline as model compounds. Comprehensive microstructural characterization was performed through ICP-OES, N 2 physisorption, HRTEM, SEM, and XPS techniques. The investigation revealed that both the catalytic and microstructural properties of the catalysts gradually changed from the supported catalysts to the bulk catalysts with the gradual increase of the metal loadings. This transition was accompanied by a significant enhancement in activity and hydrogenation selectivity compare to the supported catalysts. Nonetheless, this catalyst preserved the benefits of a superior pore structure, straightforward preparation methods and excellent regeneration.
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ChemistrySelect
·
2024
·Vol. 9
·期 34
·e202403054
·
IF 1.9
Yifei Wang,Ze Wang,Pengfei Qin,Songgeng Li
Graphical Reactivities of 2-methylphenol, 2-methoxyphenol, 4-methylphenol and 4-methoxyphenol with formaldehyde, and the thermal stabilities of the resoles are investigated. The reactivity of ortho phenol is found higher than that of para phenol. The resole of para phenol has a higher thermal stability than that of ortho phenol. The resole of methylphenol generally has a higher thermal stability than that of methoxyphenol. Bio-oil formaldehyde resole (BFR) can be used as adhesive in plywood industry. However, the BFR has a lower thermal stability, and the reason is still unclear. Herein, the reactivities of four representative phenolic compounds in bio-oil, including two ortho phenols (2-methylphenol, 2-methoxyphenol) and two para phenols (4-methylphenol and 4-methoxyphenol), as well as the thermal stabilities of the prepared resoles are investigated. The results show that the reactivity of an ortho phenol is higher than that of a para phenol. The resole prepared from a para phenol has a higher thermal stability than that of an ortho phenol. The resole of an ortho phenol decomposes even when heated at the low temperature of 100 °C. The resole of a methylphenol generally has a higher thermal stability than that of a methoxyphenol. Based on the results, the reason for the low reactivity of bio-oil and the low thermal stability of BFR are speculated.
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高影响因子
FUEL
·
2025
·
IF 7.5
Dandan Luo,Lan Yi,Jialing Chen,Hao Luo,Yuncai Song,Yi Huang,Xiaoqin Wu,Wen-Ying Li
The upgrading of coal-based fuels by eliminating acidic phenols and basic N-heterocyclic compounds is key to generating clean fuels, yet their simultaneous elimination is still a formidable challenge. According to this research, a tetraethylammonium chloride/oxalic acid (TEAC/OA) deep eutectic solvent (DES) realizes high simultaneous extraction efficiencies (>97 %) and a synergistic promotion: m -cresol’s extraction efficiency is increased from 90.6 % to 97.5 % by the presence of quinoline. In order to reveal the origin of this high performance, the integration between multi-scale simulations and spectroscopic analysis was conducted. The findings reveal that the high performance is caused by a complex “division-of-labor” system, where the Cl – anion anchors m -cresol while the quinoline is sequestered by the TEA + and OA. This selective capture is thermodynamically boosted, with the target molecules showing greater calculated interplay energies than the oil matrix. A near two-order-of-magnitude reduction in the diffusion parameters of the target molecules upon extraction further confirms the merit of this molecular “caging”. This research shows an effective method to purify complicated fuel oils and set up a novel principle of synergistic design for next-generation extractive separation media.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2025
·
IF 6.2
Feng Wang,Shouhui Jiao,Xiaoqi Zhang,Ying Yang,Xiaohan Jin,He Liu,Zongxian Wang,Aijun Guo
Although highly reactive olefinic species are abundant in thermally cracked oil, previous studies have predominantly focused on the macroscopic fouling effects of aliphatic olefins during transportation/storage. In contrast, the molecular-level mechanisms by which aromatic olefins promote coking during thermal conversion remained unclear. This work systematically investigated how aromatic olefins drive molecular growth and coke formation of heavy aromatic fractions. Thermal conversion experiments with vacuum residue (VR), resins (Re), and asphaltenes (Asp) mixed with olefin model compounds revealed that aromatic olefins accelerated coking compared to aliphatic olefins, with the coking-promoting effect intensifying as the number of aromatic rings in the molecule increased. At 410°C for 60 min, the addition of 5 wt% 9-vinylanthracene to VR increased the coke yield from 1.35 wt% to 5.72 wt%, versus 1.68 wt% with the addition of 5 wt% 1-octene. Similarly, the addition of 5 wt% 9-vinylanthracene elevated the coke yields for Re and Asp systems from 0.66 wt% and 41.28 wt% to 5.13 wt% and 50.84 wt%, respectively, compared to 1.08 wt% (Re) and 43.36 wt% (Asp) observed with the addition of 1-octene. Model compound system studies demonstrated that, aromatic olefins, unlike 1-octene, could further react with primary addition products formed by their initial co-addition with conventional aromatics, leading to the formation of secondary and high-order addition products. Notably, aromatic olefins exhibited increasing reactivity in continuous co-addition reactions as the number of aromatic rings increased. This was supported by 42.2 % high-order addition products detected in the toluene/9-vinylanthracene system versus 30.1 % in the toluene/styrene system. This study elucidated that aromatic olefin promoted molecular growth through continuous co-addition reactions, ultimately triggering phase separation and coke formation. The findings provided molecular-level insights into the adverse impacts of aromatic olefins on industrial processing of thermally cracked oil.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2025
·
IF 6.2
Yinfeng Xu,Houbin Guo,Hao Shi,Hua Dong
This study successfully synthesized a highly dispersible magnetic nanocatalyst (NiFe 2 O 4 @SA) based on stearic acid modification for efficient catalytic upgrading of heavy oil. Through comprehensive characterization methods including SEM, EDS, XRD, XPS, FTIR, TGA, contact angle measurements, dispersion tests, and VSM, the structure, surface properties, thermal stability, dispersion, and strong magnetic properties of the catalyst were investigated. When applied to heavy oil upgrading, this catalyst significantly reduced the viscosity of heavy oil and upgraded heavy oil. The effects of four different upgrading strategies on heavy oil viscosity reduction were evaluated: (1) direct aquathermolysis, (2) aquathermolysis with tetralin as a hydrogen donor, (3) aquathermolysis with only the NiFe 2 O 4 @SA catalyst (without adding hydrogen donor), and (4) aquathermolysis with NiFe 2 O 4 @SA as catalyst and tetralin as hydrogen donor. Comprehensive analyses of the heavy oil before and after upgrading were conducted using viscosity measurement, SARA fractionation, elemental analysis, GC-MS, ¹H NMR, and FT-IR. The results showed that program 4# significantly reduced the viscosity of heavy oil (by 76.6 %) and greatly improved its quality. More importantly, the NiFe 2 O 4 @SA catalyst demonstrated excellent reusability: after multiple cycles of use, heavy oil upgrading efficiency (viscosity reduction) remained stable; elemental analysis results of the upgraded oil after five cycles further confirmed the sustainability of its performance. Crucially, TGA analysis, contact angle measurements after prolonged high-temperature treatment, and VSM testing of the catalyst after recycling indicated that its thermal stability, surface properties, and magnetic property were well preserved, highlighting its outstanding durability. This study provides a new strategy for developing efficient, stable, and recyclable heavy oil upgrading catalysts.
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