CHINESE JOURNAL OF POLYMER SCIENCE
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2014
·Vol. 32
·期 12
·1628-1638
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IF 1.42
Xiang Yan-hui,Liu Fu,Xue Li-xin,Shen Jian-hui,Lin Hai-bo
A supercritical carbon dioxide (ScCO 2 ) assisted phase inversion was developed to produce microporous poly(vinylidene fluoride) (PVDF) membranes whose morphology characteristics arise from both liquid-liquid demixing and solid-liquid demixing (crystallization). This result was confirmed by Fourier transform infrared spectroscopy (FTIR), from which both α and β crystals were found. As revealed by contact angle experiment, the PVDF membranes prepared via ScCO 2 assisted phase inversion were more hydrophobic compared with the control membrane produced via conventional immersion-precipitation technique. In particular, the sample with 15 wt% PVDF prepared at 45 °C and 13 MPa exhibited a contact angle of 142°, which was mainly caused by the multilevel micro- and nano-structure. The effects of polyethylene glycol (PEG), polyvinyl pyrrolidone (PVP) and lithium chloride (LiCl) on the structures and crystal form were investigated. PVP promoted the formation of α phase crystal form, while PEG boosts the evolution of β phase. LiCl restrained the crystallization degree of PVDF membrane under ScCO 2 .
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Journal of Energy Chemistry
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2014
·
IF 0
Yong Xie,Rui-Xia Yang,Nian-Yu Huang,Hua-Jun Luo,Wei-Qiao Deng
We reported a bifunctional material, Cr-salen implanted conjugated microporous polymer (Cr-CMP), which is able to capture excellent CO 2 amounts and has a remarkable catalytic activity towards the cycloaddition reaction of CO 2 to epoxides forming cyclic carbonates at mild conditions without additional solvents. This heterogeneous Cr-CMP catalyst has a superior catalytic activity to its related homogeneous catalyst and can be reused more than ten times without a significant decrease in catalytic activity.
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AICHE JOURNAL
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2014
·Vol. 60
·期 12
·4232-4240
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IF 2.581
Kuan Huang,Xiao-Min Zhang,Yun Xu,You-Ting Wu,Xing-Bang Hu,Yun Xu
The solubilities of H 2 S and CO 2 in four protic ionic liquids (PILs)—methyldiethanolammonium acetate, methyldiethanolammonium formate, dimethylethanolammonium acetate, and dimethylethanolammonium formate were determined at 303.2–333.2 K and 0–1.2 bar. It is shown PILs have higher absorption capacity for H 2 S than normal ionic liquids (ILs) and the Henry's law constants of H 2 S in PILs (3.5–11.5 bar at 303.2 K) are much lower than those in normal ILs. In contrast, the solubility of CO 2 in PILs is found to be a magnitude lower than that of H 2 S, implying these PILs have both higher absorption capacity for H 2 S and higher ideal selectivity of H 2 S/CO 2 (8.9–19.5 at 303.2 K) in comparison with normal ILs. The behavior of H 2 S and CO 2 absorption in PILs is further demonstrated based on thermodynamic analysis. The results illustrate that PILs are a kind of promising absorbents for the selective separation of H 2 S/CO 2 and believed to have potential use in gas sweetening. © 2014 American Institute of Chemical Engineers AIChE J 60: 4232–4240, 2014
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2015
·
IF 2.679
Dong Fu,LeMeng Wang,Pan Zhang,ChenLu Mi
The saturated solubility of CO 2 in monoethanolamine (MEA) promoted 2-diethylaminoethanol (DEAE) aqueous solution was investigated at temperatures ranging from (303.2 to 323.2) K. The mass fraction and temperature dependences of the saturated solubility and CO 2 loading are illustrated. The viscosities of both CO 2 -unloaded and CO 2 -loaded DEAE–MEA aqueous solutions were measured and then calculated by using the Weiland equation. The effects of temperature, mass fraction and CO 2 loading on viscosities are demonstrated.
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RSC Advances
·
2014
·Vol. 4
·期 52
·27176-27183
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IF 3.708
Qinghua Wu,Shuixia Chen,Hui Liu
A high amino density of grafted solid amine adsorption fiber (PP-AM-PEI) for CO2 adsorption was prepared by grafting acrylamide (AM) onto the surface of a polypropylene (PP) fiber and subsequently modified with polyethylenimine (PEI). The grafting of AM on PP fibers was beneficial for introducing and assembling PEI onto the fibers. An examination by infrared and scanning electron microscopies confirmed that AM and PEI were successfully introduced onto the surface of PP fiber. PP-AM-PEI showed good thermo-stability, a high adsorption capacity for CO2 (5.91 mmol g−1). It also has good regeneration performance and could maintain almost the same adsorption capacity for CO2 after 5 recycle numbers. In addition, two other polypropylene-based adsorbents, PP-GMA-PEI (using glycidyl methacrylate (GMA) as the active monomer) and PP-AM-EDA (using ethylenediamine (EDA) as the functional monomer) were prepared. Compared with PP-GMA-EDA, PP-AM-PEI was more suitable for CO2 capture in the presence of moisture due to its hydrophilicity. The results also showed that the adsorption capacity of PP-AM-PEI was superior to PP-AM-EDA due to the high amino density of PEI.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2017
·
IF 2.726
Shufeng Shen,Yue Zhao,Yangyang Bian,Yong Wang,Hui Guo,Hui Li
The solubility of CO 2 in aqueous potassium lysinate (LysK) solutions was measured in a stirred reactor at temperatures from 298 to 353 K, for 9.0, 17.4, 25.3, 33.1 and 41.2 mass% LysK and CO 2 partial pressures up to 110 kPa. The vapor-liquid equilibrium (VLE) data were interpreted using the modified Kent-Eisenberg model. The apparent equilibrium constants of carbamate hydrolysis and amino acid deprotonation were correlated as a function of temperature, CO 2 loading (expressed as mole CO 2 per mole LysK) and LysK concentration to fit the experimental solubility data. The proposed model satisfactorily predicted the VLE data for the H 2 O-LysK-CO 2 system, especially at moderate to high CO 2 loading, with an average absolute deviation within 3.2%. Liquid species in the CO 2 -loaded LysK solutions were also qualitatively characterized by 13 C NMR experiments.
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CHINESE CHEMICAL LETTERS
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2016
·
IF 1.947
Peng Cui,Xiao-Fei Jing,Ye Yuan,Guang-Shan Zhu
A novel porous aromatic framework, PAF-8, derived from tetraphenylsilane as basic building unit, was successfully synthesized via Friedel–Crafts alkylation reaction. This PAF material had high thermal stability as well as high surface area (785 m 2 g −1 ) calculated from the Brunauer–Emmett–Teller (BET) model. Meanwhile, PAF-8 possessed high performances in gas sorption and especially for CO 2 separation.
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ENERGY & FUELS
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2017
·
IF 3.091
Xin Sun,Caili Dai,Yongpeng Sun,Mingyong Du,Tao Wang,Chenwei Zou,Jiayuan He
Hydraulic fracturing has become an important stimulation technique for low/ultralow permeability reservoirs. Supercritical CO2 (SC-CO2), as a no water phase material of fracturing fluid, receives wide attention. Current researches on SC-CO2 fracturing fluid has mainly focused on its viscous properties and superiorities. However, little attention has been devoted to the interaction between SC-CO2 fracturing fluid and the oil reservoir during the fracturing process. Besides, in a low permeability reservoir, the wettability determines the oil recovery by imbibition, which is a main way to explore oil for a matrix. Therefore, it is crucial to study the wettability alteration on a low permeability oil reservoir introduced by SC-CO2 fracturing fluid. In this study, a contact angle goniometer was introduced to characterize the wettability alteration on low permeability cores by SC-CO2 fracturing fluid. Meanwhile, nuclear magnetic resonance T2 spectra, a scanning electron microscope, and a energy dispersive spectrometer were used to explain the mechanisms of wettability alteration and the adsorption of fracturing fluid was analyzed. In addition, spontaneous imbibition tests were conducted to definite the impact of wettability alteration on oil production. The results showed that the thickener in SC-CO2 fracturing fluid, fluid filter loss, and reservoir permeability were all responsible for wettability alteration on the core surface. With the increasing thickener contents and filter loss of fracturing fluid, cores turned to be intermediate and slightly water-wet from initial strongly water-wet, which was unfavorable for oil production.Comparatively low permeability cores which consist of more micro-small pores were more likely to make treated cores oleophilic, as well. Thickener adsorption was confirmed to be the main mechanism on wettability alteration by SC-CO2 fracturing fluid, which resulted in different pore surfaces, and thus a more oleophilic cores surface. On the basis of the results of spontaneous imbibition, strong lipophilicity cores corresponded to lower oil recovery, which illustrated that wettability alteration caused by SC-CO2 fracturing fluid was not favored for oil flow.
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GREEN CHEMISTRY
·
2016
·Vol. 18
·期 12
·3567-3576
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IF 8.506
Xu Jiang,Faliang Gou,Fengjuan Chen,Huanwang Jing
A series of innovative bisimidazole-functionalized porphyrin cobalt(III) complexes have been devised, synthesized and characterized using NMR, MS and elemental analysis. These homogeneous catalysts were applied to the cycloaddition of epoxides and carbon dioxide without organic solvent and co-catalyst. It was found that the performance of the catalysts deeply relies on their structural features. The alkoxyl chain length of the linkage and the imidazole position relative to the phenyl rings of porphyrin evidently affects the catalyst activities. [5,15-Di(3-((8-imidazolyloctyl)oxy)phenyl)porphyrin] cobalt(III) chloride (J-m8) and [5,15-di(2-((6-imidazolylhexyl)oxy)phenyl)porphyrin] cobalt(III) chloride (J-o6) demonstrated excellent activity under optimal reaction conditions. Synchronously, a preliminary kinetic investigation of this reaction was carried out using three catalysts and illustrated the activation energies of cyclic carbonate formation. Furthermore, a tri-synergistic catalytic mechanism has been carefully proposed in light of the features of the new catalysts and experimental results.
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Journal of CO2 Utilization
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2016
·
IF 4.764
Zhong Ying,Chao Zhang,Shan Jiang,Qifan Wu,Bin Zhang,Yancun Yu,Minli Lan,Haiyang Cheng,Fengyu Zhao
Carbon dioxide, as a carbonyl source to replace the highly toxic isocyanate, was used to prepare a new type of polyurea with amino modified polysiloxane in this work. The formation of both the modified polysiloxane and polyureas were confirmed by FT-IR spectra, 1 H NMR spectrum and 13 C NMR spectrum. The thermo-stability, solubility as well as the hydrophilicity was examined; the polysiloxane could be soluble in several polar solvents like acetone, THF, ethanol and so on. The polyureas are stable at temperature lower than 150 °C, and the synthesized polyureas are hydrophobic as they have a water contact angles larger than 90°. Moreover, the polyurea containing high urea linkage content presented excellent absorption for some organic solvents, such as C 2 H 3 Cl 3 , thus it is expected to have an application in removing organic pollutants on river.
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NEW JOURNAL OF CHEMISTRY
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2017
·Vol. 42
·期 1
·420-428
·
IF 3.269
Fenglei Liu,Shuoyu Wang,Guorong Lin,Shuixia Chen
A hyper-cross-linked resin (PDVBpc) based solid amine adsorbent was synthesized by suspension polymerization of divinylbenzene (DVB) and a Friedel–Crafts alkylation reaction, followed by impregnation with tetraethylenepentamine (TEPA), for CO2 capture. The results showed that the specific surface area and pore volume of the initial porous polymer (PDVB) remarkably increased after the Friedel–Crafts alkylation reaction, which was beneficial for increasing the loading of TEPA and the adsorption of CO2. To determine the CO2 adsorption performance, certain factors, including the TEPA loading, flow rate, CO2 concentration and adsorption temperature, were investigated. The maximum adsorbed amount of CO2 (3.11 mmol g−1) was achieved at 25 °C and a CO2 concentration of 10 vol% when the flow rate was 30 mL min−1 and the TEPA loading was 30 wt%. The optimal TEPA loading could provide sufficient active sites for CO2 capture, whereas excessive loading may lead to aggregation of the adsorbent and blockage of pore channels. An increase in temperature was unfavourable for the adsorption of CO2, because the reaction between amine groups and carbon dioxide was exothermic. A high CO2 concentration would reduce the breakthrough time but would not affect the adsorption capacity for CO2. The experimental data fitted the Avrami model well at different temperatures, which indicated that both physisorption and chemisorption contributed to the adsorption of CO2. Thus, a promising material for the adsorption of CO2 was obtained via the functionalization with TEPA of a hyper-crosslinked resin.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Yebin Guan,Juanjuan Shi,Ming Xia,Jun Zhang,Zhenfeng Pang,Alessandro Marchetti,Xiaohong Wang,Jingsong Cai,Xueqian Kong
Monodispersed zeolitic imidazolate frameworks (ZIFs) were prepared with a simple method using dimethylsulfoxide (DMSO) as solvent. This method yields ZIF-8 nanoparticles with a narrow particle size distribution of 90–110 nm and the dispersion is highly stable against agglomeration. These particles have larger nanosized porosity and enhanced CO 2 adsorption capability compared to ZIF-8 prepared with different solvents such as methanol or N , N -dimethyl formamide. Their uniform size and surface chemistry also lead to superior performance in the Knoevenagel condensation reactions. The ZIF-8 nanoparticles possess high thermal stability up to 550 °C and the preparation steps are easy for scaling up which are favorable for industrial applications.
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