INTERNATIONAL JOURNAL OF THERMOPHYSICS
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2023
·Vol. 44
·期 4
·1-25
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IF 2.2
Liang Ximei,Yang Jian,Meng Xianyang,Wu Jiangtao
A vibrating-wire apparatus was used to measure liquid density and viscosity simultaneously under high-temperature conditions. Densities and viscosities were measured along 11 isotherms at temperatures from (298.15 to 548.15) K and pressures up to 10 MPa for n -dodecane, and over a temperature range of (303.15 to 548.15) K and at equilibrium pressures up to about 6 MPa for carbon dioxide + n -dodecane. The estimated combined expanded uncertainties are 0.24 % for density and 2.2 % for viscosity with a confidence level of 0.95 ( k = 2). In addition, experimental density and viscosity data were correlated with the modified Tait equation and Tait–Andrade equation, respectively, and comparisons with literature data were made. With regard to n -dodecane, the equations present both literature data and our experimental results with deviations almost within 0.2 % for density, and 3.0 % for viscosity. For simplicity, the experimental data of carbon dioxide + n -dodecane were correlated using these two Tait-like equations directly without considering the mole fraction of CO 2 . Both correlations describe our measured data of carbon dioxide + n -dodecane almost within 0.2 % for density and 1 % for viscosity. Graphical Abstract
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Shengnan Lu,Yonghou Xiao,Qidong Zhao,Wenkai Zhao,Gaohong He
Deep desulfurization from fuel has gradually become a research hotspot with enhancing requirements of environmental protection. CPO-27-Ni was considered as one of promising adsorbents towards adsorption desulfurization by virtue of its prodigious high pore volume and high specific surface area. However, the dominant microporous channels in traditional CPO-27-Ni hinder the diffusion of thiophene sulfide and its derivatives with relatively large molecular size, which limits its desulfurization efficiency. Herein, we proposed a strategy to reasonably construct defective CPO-27-Ni with micro-mesoporous structure using N , N -dimethyloctadecylamine (DMA18) as a template, aim at improving the diffusion efficiency by introducing meso -pores. Different amounts of DMA18 were introduced to synthesize defective CPO-27-Ni (DMA18-C- X ) by solvothermal method, and DMA18-C-0.5 (the mole ratio of added DMA18 to Ni 2+ was 0.5) exhibited a satisfactory desulfurization performance. The dynamic breakthrough adsorption capacities of dibenzothiophene, benzothiophene and thiophene over the DMA18-C-0.5 were remarkably promoted, which were as high 3.79, 6.45 and 9.29 times as the traditional CPO-27-Ni, respectively. The crystal structure of CPO-27-Ni was not altered after adding template agent DMA18, while a uniform distribution of mesopores appeared. The largest mesopore attained a size of 2.8 nm, which effectively promoted the full exposure of more unsaturated Ni 2+ active sites and enhanced the interaction between Ni 2+ active sites and sulfides, resulting in strengthened adsorption desulfurization performance. This method of introducing proper defects to construct mesopores in MOFs provides some useful references for preparing high-efficiency desulfurization adsorbents.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Qian Zhang,Si Chen,Zhi Huang,Yanying Liu,Jun-ming Hong
Nitrogen atom doping can effectively improve the electrocatalytic performance of graphene materials, and different nitrogen species play various roles. At present, high calcination temperature is commonly used to promote the production of graphitic N. To realize the oriented low-temperature doping of nitrogen atoms in graphene structure, we used O 3 -annealing method in this study to successfully prepare high-content graphitic N doped graphene oxide at 200 °C. Characterization results revealed that O 3 -annealing method can effectively promote the doping of N and O atoms. In addition, O 3 -annealing creating large amount defects for graphene, which directionally promoted the formation of graphitic N (reach 96.82%), which positively affected the improvement of material electrocatalytic properties. The results of bisphenol A (BPA) electrocatalytic degradation by O 3 -5 min-60 °C NGO showed that the degradation efficiency of BPA can reach 100% in 50 min under optimal conditions. The main active substances, namely O 2 − and 1 O 2 were probably generated from the edge oxygen functional groups (O-C=O and C=O) of the materials. BPA underwent a series of reactions, and was finally mineralized to CO 2 and H 2 O. This study provides a new strategy for the directional preparation of high content graphitic N doped graphene oxide for practical application.
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COMBUSTION SCIENCE AND TECHNOLOGY
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2022
·
IF 2.133
Fanggang Zhang,Yilun Liang,Juan Wang
Nano-sized Co3O4 is an effective catalyst for fuel oxidation due to its high capacity of oxygen storage, and it is thus frequently applied in improving the oxidation performance of hydrocarbon fuels. In our present work, attempts were made to study the catalytic performance of Co3O4 for the oxidation of liquid fuels over a wide temperature range. Neat n-decane and n-decane/1,2,4-trimethylbenzene mixtures were chosen because they are typical liquid hydrocarbon fuels. The evidences from this study suggest that the temperatures of both fuel ignition and full conversion are significantly decreased by Co3O4 catalyst. CO2 is the only product detected in the catalytic oxidation, which also proves the complete oxidation of the liquid fuels. Furthermore, to explore the possible reaction pathways on the catalyst surface, temperature-dependent and time-dependent in situ DRIFTS were employed to identify surface species and analyze catalytic mechanism. Various surface intermediates including bidentate, monodentate carbonate species, carboxylate species and molecular adsorbed n-decane have been observed. The experimental results indicate that n-decane oxidation over Co3O4 proceeds via the Mars-van Krevelen mechanism where lattice oxygen plays a critical role in the fuel oxidation.
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SYNTHETIC COMMUNICATIONS
·
2022
·
IF 1.937
Jinchen Yang,Ling Chen,Yibo Dong,Jinli Zhang,Yangjie Wu
ABATRACTA direct approach to N,N′-disubstituted urea/thiourea from the self-condensation reactions of isothiocyanates in water has been developed. This access tolerated a wide range of functional groups on the aromatic ring, providing a practical and environment-friendly process to N,N′-disubstituted urea/thiourea in moderate to excellent yields from safe and easily available starting materials. A plausible mechanism of the desulfurization self-condensation reaction for urea was also proposed and the role of di-tert-butyl peroxide (DTBP) and copper catalyst in the present strategy was demonstrated with the help of ESI mass spectrometry of intermediate studies.
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APPLIED SURFACE SCIENCE
·
2021
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IF 6.707
Yidong Sun,Xingpu Wang,Qiang Fu,Chunxu Pan
Photocatalytic decomposition of water for hydrogen production is considered a promising solution to address the issues of energy crisis and environmental pollution. Herein, a kind of novel hollow flower-like 0D/3D Zn 0.5 Cd 0.5 S/NiCoZn-LDH with an n-n heterojunction is synthesized via precipitation and cation-exchange methods. Photocatalytic experiments reveal that the composite photocatalyst exhibits excellent performance compared with pure Zn 0.5 Cd 0.5 S. In other words, the composite photocatalyst shows enhanced response to visible light, three-fold increased transient photocurrent, and the hydrogen production rate reaching to 1100 μmol/h/g, approximately 7.3 times higher relative to pure Zn 0.5 Cd 0.5 S. The reaction mechanism is also elucidated. Zn 0.5 Cd 0.5 S/NiCoZn-LDH shows a type II n-n heterojunction, which can effectively transfer and separate the photo-generated electrons and holes, and is beneficial for the photocatalytic hydrogen production reaction. The synthesized composite photocatalyst is prepared using a simple method, enabling future large-scale production and applications.
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Frontiers in Chemistry
·
2021
·
IF 5.221
Yang Xiaohui,Lu Wanlong,Cao Jingning,Zhai Chenyang,Li Weili,Zha Fangwen,Lu Guanghao,Tian Hongkun,Yu Demei,Bu Laju
The preparation of micron- to nanometer-sized functional materials with well-defined shapes and packing is a key process to their applications. There are many ways to control the crystal growth of organic semiconductors. Adding polymer additives has been proven a robust strategy to optimize semiconductor crystal structure and the corresponding optoelectronic properties. We have found that poly(3-hexylthiophene) (P3HT) can effectively regulate the crystallization behavior of N,N′-dioctyl perylene diimide (C8PDI). In this study, we combined P3HT and polyethylene glycol (PEG) to amphiphilic block copolymers and studied the crystallization modification effect of these block copolymers. It is found that the crystallization modification effect of the block copolymers is retained and gradually enhanced with P3HT content. The length of C8PDI crystals were well controlled from 2 to 0.4 μm, and the width from 210 to 35 nm. On the other hand, due to the water solubility of PEG block, crystalline PEG-b-P3HT/C8PDI micelles in water were successfully prepared, and this water phase colloid could be stable for more than 2 weeks, which provides a new way to prepare pollution-free aqueous organic semiconductor inks for printing electronic devices.
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PubMed
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Zhichao Yang,Weiquan Cai,Jinpeng Zhou,Qing Xia,Tielin Wang
A fast, large-scale, and stable preparation method was successfully developed to obtain η-Al2O3 microspheres with particle sizes of 3–10 μm from cheap and widely sourced NaAlO2 solution using N,N-dimethylformamide (DMF) as a morphological modifier and a precipitant simultaneously at room temperature. The yield of alumina increases from 33.3 to 77.3% by increasing the dose of DMF from 100 to 400 mL. The utilization efficiency of DMF significantly increased by adding fresh NaAlO2 into the reused filtrate after separating the bayerite precipitate (precursor of η-Al2O3). Importantly, the η-Al2O3 microspheres obtained from the filtrate-reuse experiments show the stable phase structures, morphologies, and pore structure properties. Furthermore, the typical η-Al2O3 microspheres supported Pd catalyst presents a higher catalytic activity of 10.6 g/L for the hydrogenation of anthraquinone than that of the commercial γ-Al2O3-supported Pd catalyst (8.5 g/L), suggesting that the as-prepared η-Al2O3 microspheres have good application prospects for catalytic hydrogenation and related fields.
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JOURNAL OF MOLECULAR LIQUIDS
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2020
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IF 5.065
Chunying Zhu,Xiaojie Liu,Taotao Fu,Xiqun Gao,Youguang Ma
The densities and viscosities of the binary solutions EAE (2-(Ethylamino) ethanol) + H 2 O, DMEA ( N -dimethylethanolamine) + H 2 O, EAE + DMEA and ternary solution EAE + DMEA + H 2 O were measured at T = (293.15–333.15) K. Furthermore, the excess molar volume , partial molar volume , apparent molar volume, limiting partial molar volume and viscosity deviation were calculated. Based on the volumetric properties and viscosity properties of the solutions, the solute-solute and solvent-solute interactions were analyzed.
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BIOORGANIC & MEDICINAL CHEMISTRY
·
2016
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IF 2.923
Honglei Xie,Yiqun Li,Changlin Bai,Ruifeng Wang,Chunchi Liu,Chenzhou Hao,Bin Lin,Maosheng Cheng,Dongmei Zhao
Epidemiological studies have identified that the risk of cardiovascular events increases due to the decreased levels of high density lipoprotein-cholesterol and the elevated levels of low density lipoprotein-cholesterol. Herein, we report a novel series of N , N -3-phenyl-3-benzylaminopropionanilide derivatives, which were identified as potent cholesteryl ester transfer protein (CETP) inhibitor. The initial lead compound L10 (IC 50 8.06 μM) was found by pharmacophore-based virtual screening (Dong-Mei Zhao et al., Chin. Chem. Lett. 2014 , 25 , 299). After systematic structure variation and biological testing against CETP, two different series were identified as scaffolds for potent CETP inhibitors. One is N , N -3-phenyl-3-benzylaminopropanamide derivatives, which were investigated in our previous paper ( Bioorg. Med. Chem. 2015 , doi: http://dx.doi.org/10.1016/j.bmc.2015.12.010 ). The most potent compound HL16 in that series has the IC 50 of 0.69 μM. The other series is N , N -3-phenyl-3-benzylaminopropionanilide derivatives, which was investigated in current study. Further optimization of the structure–activity relationship (SAR) resulted in H16 (IC 50 0.15 μM), which was discovered as a potent CETP inhibitor in vitro by BODIPY-CE fluorescence assay . In addition, the results of pharmacodynamics studies showed that H16 exhibited both favorable HDL-C enhancement and LDL-C reduction in vivo by hamster. It also has an excellent stability in rat liver microsomal.
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PubMed
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FUEL PROCESSING TECHNOLOGY
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2023
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IF 7.5
Ke Li,Mengxia Yan,Haili Wang,Lifen Cai,Ping Wang,Huimin Chen
As a typical high-efficient alkane aromatization catalyst, Pt/KL is prone to deactivation due to the sintering growth of Pt on the outer surface of KL and the channel blockage caused by carbon deposition , which is further exacerbated by the one-dimensional channel structure of KL. Therefore, a series of encapsulated catalysts combining the three-dimensional channel structure advantages of S-1 with the role of potassium are prepared and evaluated. It is shown that the encapsulated catalyst KPt@S-1-02 modified by moderate potassium exhibits extremely superior stability and no significant deactivation is observable after n-heptane aromatization for 180 h under harsh conditions. On the one hand, encapsulation structure enables a strong anti-agglomeration ability of Pt and the topological structure of S-1 endows the encapsulation catalysts less susceptible to channel blockage, which has been demonstrated by HAADF-STEM and N 2 -adsorption. On the other hand, characterizations involving NH 3 -TPD, CO-DRIFT and HAADF-STEM verify that the modification by an appropriate amount of K can inhibit acid sites of catalysts and improve Pt dispersion and electron density, thus enhance the stability of catalysts. However, excessive K can serve as weak acid sites, poison of active sites and inhibitor of H 2 adsorption on Pt surface, leading to deactivation of the catalyst.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 35
·期 4
·674-679
·
IF 1.071
Shen Xizhou,Song Hao,Fang Liuya,Deng Hang,Gan Feng,Shen Zhi
Since the content of thiophene in coking crude benzene is high, it is necessary to remove it from coking crude benzene for efficient utilization. In this study, an important intermediate, N, N -dimethyl-2-thiophenecar-boxamide, was synthesized from thiophene and dimethylcarbamyl chloride. The influences of the dosages of dimethylcarbamyl chloride and ZnCl 2 catalyst, reaction temperature and time on the removal rate were further explored based on the reaction kinetics. The structure of the target product was characterized by means of MS, 1 H NMR and 13 C NMR. The removal rate of thiophene was 98.14% after the reaction for 2 h and thiophene was almost removed after the reaction for 3 h under the optimal reaction conditions[a molar ratio of n (thiophene): n (dimethylcarbamyl chloride): n (ZnCl 2 )=1:12:10, 300 r/min, 318 K and 101.325 kPa]. The acylation of thiophene with dimethylcarbamyl chloride was approximately in accord with the first order kinetic equation at 303–323 K. The activation energy was 53.9850 kJ/mol and the pre-exponential factor was 1.4521×10 9 h −1 .
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