Materials Today Chemistry
·
2026
·
IF 7.4
Jingdong Gou,Xianjie Wang,Qibin Xia,Jinhui He,Xue Ma,Yaning Zhao,Hengsheng Wei,Louwei Cui,Huiyong Chen,Jun Yang,Liuyi Pan,Dong Li
The precise regulation of sub-nanometer pore structures in carbon molecular sieves (CMS) is pivotal for the efficient separation of C8 cycloalkane isomers. This study addresses the separation challenge between ethylcyclohexane (ECH) and its cis-1,2-dimethylcyclohexane(cis-1,2-DMCH) and trans-1,3-dimethylcyclohexane(trans-1,3-DMCH) counterparts. We systematically investigate the structural properties of CMS with tunable pore sizes in the sub-nanometer range (5.4–29 Å) and their impact on the adsorptive separation performance for C8 cycloalkanes. A material system comprising six CMS samples with distinct pore dimensions was constructed. By integrating static adsorption, kinetic analysis, dynamic breakthrough experiments, and molecular dynamics simulations, we elucidate the structure–performance relationships. The results demonstrate that CMS-4, featuring a narrowly distributed ultramicropore size of 6.4 Å and a high micropore volume (0.42 cm 3 g −1 ), exhibits optimal adsorption capacity for ECH (19.4 mg g −1 ) and superior selectivity (with selectivity coefficients of 1.98 and 2.02 over cis-1,2-DMCH and trans-1,3-DMCH, respectively). Adsorption kinetic studies reveal a diffusion rate order of ECH > trans-1,3-DMCH > cis-1,2-DMCH, which aligns well with the hierarchy of effective molecular widths derived from their minimum cross-sectional areas, confirming the regulatory role of molecular geometry in diffusion behavior. Dynamic breakthrough experiments further validate the selective separation capability of CMS-4 for ECH under continuous flow conditions. Molecular simulations clarify that the differences in diffusion behavior originate primarily from steric hindrance effects related to molecular cross-sectional size, while the stronger interaction energy between ECH and the carbon framework provides a thermodynamic basis for its preferential adsorption. The three-dimensional "pore-size matching–molecular size–diffusion kinetics" correlation model established in this work provides both a theoretical foundation and experimental support for the rational design and performance optimization of high-performance carbon molecular sieves aimed at efficient liquid-phase isomer separation.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2026
·
IF 6.5
Wanyi Li,Wenbiao Zhang,He Li,Yi Tang,Yahong Zhang
Molybdenum disulfide (MoS 2 ) holds promise in catalysis due to its edge-confined activity, but its structural rigidity and strong in-plane Mo-S bonding limit the exposure of active sites. Herein, we propose a high-curvature support-induced method using ultrasmall ZSM-5 subcrystals (Z-5-SC) to tailor the formation of NiMoS 2 on them. The high curvature and abundant external silanol groups of Z-5-SC induce tensile strain and strong interfacial anchoring, generating short and curved NiMoS 2 slabs with enhanced sulfur vacancies and Ni-Mo-S phase formation. Compared to nanocrystalline zeolite supports, the NiMoS 2 /Z-5-SC exhibits 7.3-fold higher hydrodesulfurization (HDS) activity toward 4,6-dimethyldibenzothiophene ( k HDS = 0.624 h −1 ), rapid hydrodenitrogenation (HDN) response with minimized HDS suppression in simultaneous HDS and HDN reactions, and excellent cycling stability over 15 cycles. This work presents an effective curvature-engineering strategy to enhance the catalytic potential of MoS 2 , offering new insights into the design of engineered two-dimensional materials for hydrotreating and beyond.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Shasha Jiang,Xiaoyu Li,Shuitao Gao,Cheng Ma,Tongyue Wu,Zhijie Liu,Ting Gu,Jinwan Qi,Yun Yan,Xinmin Song,Jianbin Huang
Hydrocarbons are well-known insoluble oils which are rarely considered as stimuli to trigger molecular self-assembly transition. We report in this work that hydrocarbons are a class of distinct stimuli for the self-assembly transition in the catanionic surfactant systems . Particularly, the cyclic hydrocarbons and chain-like ones has exactly opposite impact. By solubilizing in the palisade region of surfactant bilayers, the cyclic hydrocarbons would increase the volume of the hydrophobic part of the surfactant, thus increasing the packing parameter and leading to structures with smaller curvature. On the contrary, the chain-like hydrocarbons will be insolubilized in the interior of the hydrophobic domains formed by surfactant, which therefore swells the surfactant bilayers and increases the curvature of the outer layer. As a result, the self-assembly would change into structures with larger curvature. For this reason, addition of cyclic alkanes, such as ethylcyclohexane and ethylbenzene , leads to the transition from vesicles to lamellae, whereas addition of chain-like ones, such as octane, results in the transition from vesicles or lamellae to nanoemulsions . It is noticed that the saturation state of the hydrocarbons is not relevant to the self-assembly transition, and whether the alkanes are cyclic or chain-like is the determinative factor that decides which direction the self-assembly would transform to. We expect the current study is very promising in guiding enrichment and separation of organic matters.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2022
·
IF 1.193
Kun WANG,Er-Fei DONG,Min FANG,Ting CHEN,Wei-Ju ZHU,Cun LI
A new ratio fluorescence sensor based on mercaptamine capped cadmium telluride quantum dots (Mea-CdTe) and benzocoumarin-3-carboxylic acid (BTA) were constructed. The ratio fluorescence sensor (BTA@Mea-CdTe) was synthesized by amidation reaction between the amino groups on the surface of Mea-CdTe quantum dots and the carboxyl groups of BTA. It is found that Hg 2+ ions react with the amino groups on the surface of the quantum dots in the BTA@Mea-CdTe sensor to quench the fluorescence, but it has no effect on the fluorescence of grafted BTA. The sensor has good selectivity and high sensitivity for Hg 2+ ions detection. The detection linear range is 0.4–1.2 µM, and the detection limit is 0.03 µM. This ratio fluorescence sensor can be used for Hg 2+ visual recognition in water sample detection with obvious color change.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Haoqiang Sheng,Xiaobin Huang,Yuan Ji,Zhengchuang Zhao,Wenbin Hu,Junming Chen,Zemin Ji,Xiangzhao Wang,Hong Liu
Soot is carbonaceous particulate produced by incomplete combustion of hydrocarbon fuel, reducing the efficiency of energy utilization and affecting the environment and people’s health adversely. Naphthenic hydrocarbons are essential components in diesel and kerosene, generating great quantities polycyclic aromatic hydrocarbons (PAHs) and subsequently soot particles in the combustion process at high temperature. In this study, a new strategy of cycloalkane combustion at low temperature is developed to reduce the formation of the PAH soot-precursors in the combustion process to decrease soot emission. Borane-dimethyl sulfide (BDMS) and n- hexadecane were employed to promote the low-temperature ignition of cycloalkanes and the reduction of soot emission. By adding of 5% BDMS, the ignition temperature of hybrid fuel 10 (10 vol% n- hexadecane, 90 vol% cyclohexane) decreased drastically from 570 °C to 213 °C and PAH formation was reduced by 87%. In the flame development stage of the combustion process, the flame of BDMS/hybrid fuel 10 appears green in color and is larger than the blue flame in the stage of flame reduction, indicating the complete combustion of cycloalkane fuels. By this strategy of low-temperature combustion, the generation of PAH during combustion of cyclohexane decreases, thereby reducing the generation of soot and improving hydrocarbon fuels utilization.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2022
·Vol. 51
·期 7
·752-767
·
IF 2
Li Dan,Pang Yan,Wang Jingying,Sun Danlin,Zhang Xuena,Yue Danwei,Hao Longxia
Three C8 alkanes ( n -octane, iso -octane and ethyl cyclohexane) as additives were blended with methyl laurate to prepare binary systems of fuel blends for density, viscosity and refractive index measurement. The excess properties of volumes and viscosity of the three binary systems (methyl laurate + n -octane), (methyl laurate + iso -octane) and (methyl laurate + ethyl cyclohexane) were obtained and compared, which were also fitted to Redlich–Kister equation. The correlated values from Redlich–Kister equation are in good agreement with those from experimental data. The results can be used for the research of the mixture behaviors and development of biodiesel-diesel fuel blends.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Bowen Jiang,Jia Liu,Guoqiang Yang,Zhibing Zhang
A novel series of halogen free, hydroxyl group containing poly(ionic liquid)s (PILs) was first synthesized from glycerol dimethyl acrylate (GDA) and 1-vinyl imidazole (1-VIM) through free radical polymerization , follow by an alkylation step and an ion-exchange procedure to form the final imidazolium hydrogen carbonate heterogenous catalyst poly(HCO 3 -OH- n ). The chemical and physical properties were investigated by varying the monomer ratio between GDA and 1-VIM. Among them, poly (HCO 3 -OH-2) exhibited the highest catalytic activity for CO 2 cycloaddition, with the yield of chloropropene carbonate 90% under mild conditions (80 °C, 0.1 MPa, 12 h, 0.15 g catalyst for 32 mmol epichlorohydrin) in the absence of any cocatalyst, metal or solvent. A range of substrates with good to excellent yields under atmosphere was obtained. The poly(HCO 3 -OH- n ) catalyst is collectable and still remains acceptable catalytic activity after six runs. Finally, a preliminary kinetic is calculated on the basis of poly(HCO 3 -OH-2) with the activation energy value of 79.5 kJ·mol −1 . This study highlights that the poly(HCO 3 -OH- n ) enable to reach efficient CO 2 conversion under mild conditions.
✓ 已验证
产品关联
DOI
高影响因子
Defence Technology
·
2022
·
IF 4.035
Jin-hu Liang,Shu-tong Cao,Fei Li,Xiao-liang Li,Rui-ning He,Xin Bai,Quan-De Wang,Yang Li
The pyrolysis of cyclohexane, methylcyclohexane, and ethylcyclohexane have been studied behind reflected shock waves at pressures of 5 and10 bar and at temperatures of 930–1550 K for 0.05% fuel diluted by Argon. A single-pulse shock tube (SPST) is used to perform the pyrolysis experiments at reaction times varying from 1.65 to 1.74 ms. Major products are obtained and quantified using gas chromatography analysis. A flame ionization detector and a thermal conductivity detector are used for species identification and quantification. Kinetic modeling has been performed using several detailed and lumped chemical kinetic mechanisms. Differences in modeling results among the kinetic models are described. Reaction path analysis and sensitivity analysis are performed to determine the important reactions controlling fuel pyrolysis and their influence on the predicted concentrations of reactant and product species profiles. The present work provides new fundamental knowledge in understating pyrolysis characteristics of cyclohexane compounds and additional data set for detailed kinetic mechanism development.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2021
·
IF 3.178
Dan Li,Yujia Zheng,Jingying Wang,Yan Pang,Meifang Liu
Densities and viscosities of ternary system (1-pentanol + ethylcyclohexane + methyl myristate) and the corresponding binary systems, (1-pentanol + ethylcyclohexane), (1-pentanol + methyl myristate), and (ethylcyclohexane + methyl myristate) were determined at different temperatures from 293.15 to 323.15 K. The experimental data were further employed to calculate excess molar volume ( V m E ) and viscosity deviation (Δ η ). Over the whole composition range, the V m E values show positive deviations from ideal behavior and the Δ η values are negative. The V m E values for the ternary mixtures were also correlated with the corresponding binary data using Cibulka and Redlich–Kister equations, respectively. The experimental data and results provide useful base data for further thermodynamic studies of alcohol–biodiesel–diesel blends.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Weijian Lu,Jianwen Zhang,Shiqi Zhang,Chen Ji,Ying Wu,Huiyong Chen,Yanxiong Fang,Jinxiang Dong,Baoyu Liu
The development of zeolite catalysts for linear alkylbenzene production is of crucial importance in achieving green chemical processes for the detergent industry. In the present research, the fabricated beta zeolite catalysts exhibited extraordinary activity (73%) and selectivity of 2-LAB (85%) in the alkylation of benzene with 1-dodecene, which benefited from the open micropore-to-mesopore networks, exposed acid sites, and shape-selectivity of special topology of beta zeolites. The computer calculations revealed that both benzene and 1-dodecene can enter into the 12-MR channels of beta zeolites, in which 1-dodecene was adsorbed on the surface of 12-MR channels in the form of chemical adsorption, and the fixed 1-dodecene was attached to benzene combined with the matched pore size of 12-MR channels of beta zeolites to effectively produce the desired 2-LAB. Moreover, the mesopore beta zeolites also presented superior stability compared with traditional micropore beta zeolite in the alkylation between benzene and 1-dodecene due to enhanced diffusion. Our work definitely paved a way to develop mesopore beta zeolites as a new type of highly efficient heterogeneous catalysts for industrial production of 2-LAB.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Wanbo Zhang,Ping Guo,Xingbo Ge,Jianfen Du,Zhouhua Wang
In CO 2 enhanced oil recovery process, the interactions between CO 2 and oil components are complex since crude oil is a mixture of n-alkanes, cycloalkanes , aromatics, resin, asphaltene and other compounds. To investigate the effects of temperature, pressure and molecular structure on CO 2 solubility in cycloalkanes and the resulting cycloalkane volume expansion, the solubility of near critical and supercritical CO 2 in cyclopentane (CP), cyclohexane (CH), methylcyclohexane (MCH), methylcyclopentane (MCP) and ethylcyclohexane (ECH) and the volume expansion factor of cycloalkanes at diverse temperature and pressure were measured. It was observed that increasing temperature decreases CO 2 solubility, while CO 2 solubility increases with pressure increasing. Compared with CP and CH, it's harder for CO 2 to dissolve in their methyl or ethyl substituents. For homologues, CO 2 solubility decreases with carbon number increasing. The volume expansion factor and solubility have a same variation tendency with temperature, pressure and molecular structure. The experimental results of solubility were correlated with Fornari's model and PR equation of state with the maximum average absolute relative deviation (AARD) of 2.8% and 6.8%, respectively. The excess molar volume of CO 2 + cycloalkane mixtures was calculated to be negative and increases with pressure.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Haoqiang Sheng,Xiaobin Huang,Yuan Ji,Zhengchuang Zhao,Zhijia Chen,Hong Liu
Scramjet engines play a vital role in hypersonic vehicles , but they suffer from the ignition issue due to the low reactivity of hydrocarbon fuel when flying at low flight Mach numbers . In this work, the low-temperature ignition performance of multi-component kerosene was significantly improved by only adding 3% borane-dimethyl sulfide (BDMS), resulting in the low-temperature ignition reducing greatly from 620 to 160 °C. This indicates that BDMS was an effective activator for multi-component kerosene. To analyze the low-temperature efficient activation mechanism of multi-component kerosene, paraxylene, ethylcyclohexane, n -decane, and n -tetradecane (each with added 3% BDMS) were studied as they are essential components in kerosene, respectively. The low-temperature ignition performance and the ignition process of n-alkane were significantly improved and changed for a single component of hydrocarbon. There was a synergistic promotion effect for multi-component hydrocarbons with the addition of activator BDMS. BDMS could significantly improve the low-temperature ignition performance and oxidation of ethylcychohexane in the presence of n -tetradecane. The addition of paraxylene promoted the evaporation of the hybrid fuel of n -tetradecane/ethylcyclohexane. The results obtained from this study could help to gain a better understanding of the low-temperature ignition of multi-component kerosene and provide an effective method to solve the scramjet ignition problem at low flight Mach numbers.
✓ 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）