FUEL
·
2018
·
IF 4.908
Xuepeng Wu,Yue Zhang,Xin Sun,Yongping Huang,Caili Dai,Mingwei Zhao
Hydraulic fracturing is playing a more and more important role in rapid shale oil and gas recovery development. Meanwhile, damage to the reservoir fracture and environmental contamination caused by fracturing fluid flowback water has raised serious concerns. In this study, a CO 2 -responsive surfactant, erucamidopropyl dimethylamine (EA), was synthesized and used as the thickening agent to develop a novel viscoelastic surfactant (VES)-based fracturing fluid. This fluid was responsive to the presence and pressure of CO 2 . It was not only rock formation friendly and environment benign but also readily reusable attributed to a gelling-breaking process that can be easily controlled by manipulating CO 2 gas conditions. The viscoelastic behaviors of this VES fluid were investigated through rheological measurements under ambient and elevated temperature and pressure. The fluid-rock interaction was studied in core flooding tests. Results showed a good CO 2 -responsiveness, switchable viscoelastic performance, high shear tolerance, thermal stability, good salinity tolerance , and low core damage of the fluid. The switchable rheological behavior implies this fracturing fluid can readily be reused. It is expected that this fluid finds applications not only in enhanced oil and gas recovery, but also in other areas such as CO 2 sequestration reservoir leakage sealing.
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高影响因子
Journal of CO2 Utilization
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2018
·
IF 5.503
Xianghai Song,Yuanfeng Wu,Donghui Pan,Jiahui Zhang,Siquan Xu,Lijing Gao,Ruiping Wei,Guomin Xiao
In the present work, several DVB-based polymer catalysts were prepared and used for the synthesis of glycerol carbonate (GC) from glycerol carbonylation with carbon dioxide (CO 2 ). Propylene oxide (PO) was introduced as a coupling reagent into the reaction to disturb the thermodynamics limitation. The characterization results confirmed the successful preparation of the functionalized polymer catalysts. P-DVB-(vIm-BuBr) showed the best catalytic performance among the prepared polymers. The high catalytic activity of P-DVB-(vIm-BuBr) was attributed to the presence of ionic liquid groups in the structure of the polymer. In addition, the preparation method had a significant influence on the catalytic activity of the polymer. Functionalization of the monomer with n-butyl bromide before polymerization could increase the content of ionic liquid groups of the polymer catalysts. During the reaction process, glycerol served not only as a reactant, but also as a co-catalyst to facilitate the coupling of PO with CO 2 . P-DVB-(vIm-BuBr) achieved PO conversions as high as 96% and GC yields of 81% under optimal reaction conditions. The catalyst was highly recyclable and maintained its catalytic activity after five reaction cycles.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Bin Zhu,Jindun Liu,Shaofei Wang,Jingtao Wang,Min Liu,Zhikun Yan,Feng Shi,Jiahao Li,Yifan Li
Hollow fillers with tailored nanostructures and functionalities have become promising candidates for advanced mixed matrix membranes (MMMs). Herein, polydopamine/poly (ethylene glycol) (PEG) composite microcapsules are synthesized by hard template method and embedded into the Pebax matrix to fabricate MMMs for CO 2 capture. As a well-known biomimetic adhesive, polydopamine in the capsule wall renders adequate polymer-filler interfacial adhesion. The template removal process produces through-wall mesopores , which allow rapid gas diffusion into the lumen, further significantly reducing the trans-membrane mass transfer resistance. The remaining PEG in the capsule wall not only increases CO 2 affinity, but also avoids excessive chain rigidification at polymer-filler interface. In this way, the composite capsules, compared with those without PEG, confer significantly enhanced separation performance on membranes. The optimal gas transport property of the resultant membranes is obtained with a CO 2 permeability of 510 Barrer and an ideal selectivity of 84.6 for CO 2 /N 2 at humidified state, i.e., 108%, 98% higher than those of neat Pebax membrane, respectively. In addition, owing to dopamine-enabled strong adhesion, the MMMs exhibit better stability than Pebax membrane in the long-term test at 85 °C.
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高影响因子
Energy Technology
·
2018
·Vol. 7
·期 2
·325-332
·
IF 3.175
Ke Wang,Jie Hong,Zhongyun Zhou,Zhiwei Lin,Pengfei Zhao
High efficiency alkali nitrate-containing Li 4 SiO 4 sorbents were synthesized by a hydration technique to improve their sorption performances at low CO 2 concentrations. X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), differential scanning calorimetry (DSC), and thermogravimetric analyses were used to detect the characteristics of the samples. The results showed that the presence of KNO 3 and NaNO 3 induced small crystallite size, corrugated morphologies and the formation of eutectic phases, noticeably facilitating sorption processes. At the optimized additive amount of 0.035 mol %, NaNO 3 -containing Li 4 SiO 4 reached a maximum absorption capacity (≈34.6 wt %). Moreover, both alkali nitrate-containing Li 4 SiO 4 sorbents showed good cyclic properties, demonstrating their great potential for high-temperature CO 2 capture.
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高影响因子
Journal of Environmental Chemical Engineering
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2018
·
IF 0
Yuan Wang,Cailv Zheng,Yilin Wang,Hanxiang Chen,Yun Xu
A new kind of ionic liquids has been synthesized which comprised double bonds in the structure of anions (DB-ILs). Their physical properties, including densities, viscosities, activation energies and diffusion coefficients were determined. Temperature-dependent Krichevsky-Kasarnovsky (K-K) was used to deal with the data of solubility of CO 2 in DB-ILs, thermo-properties including solve enthalpy (ΔH sol ), entropy (ΔS sol ) and Gibbs free energy (ΔG sol ) were obtained. The research shows that DB-ILs perform well at the capturing CO 2 and can be regenerated four times.
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JOURNAL OF NON-CRYSTALLINE SOLIDS
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2018
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IF 2.488
Shasha Wang,Yuelong Xu,Meifang Yan,Lihui Zhang,Zhenfa Liu
Porous carbon xerogels were successfully fabricated by carbonization of resorcinol-formaldehyde-phloroglucinol gels in the presence of surfactants . The effect of non-ionic, cationic, anionic and zwitterionic surfactants on the porous structure of carbon xerogels was investigated. Micropore structural carbon xerogels were obtained when a cationic surfactant was used. The result of surface tension test showed the non-ionic surfactant Tween 60 gave the lowest surface tension. Thermal conductivity experiments revealed the carbon xerogels in this work possessed low thermal conductivity and are suitable as thermal insulation materials. The pore size directly determined the thermal conductivity of carbon xerogels, and the thermal conductivity decreased with pore size. Among the obtained samples, the one using hexamethylenetetramine (HTM) exhibited the highest CO 2 adsorption capacity (2.89 mmol g −1 ) and adsorption selectivity as a result of the high microporosity (88.0%). Therefore, HTM-CA was identified as a promising material for CO 2 adsorption.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Yuan Zhao,Yidi Zhu,Tianle Zhu,Guiping Lin,Mingpan Shao,Wei Hong,Shiyu Hou
The series of polyethylenimine (PEI)-based solid sorbents were prepared by the wet-impregnation of PEI (Mw = 600) on the surface of six porous materials, i.e., mesoporous silicas (MCM-41, SBA-15, and KIT-6), mesoporous carbon (CMK-3), protonated titanate nanotube (PTNT), and fumed silica (FS). The resultant materials, denominated PEI/supports, were characterized by N2 adsorption/desorption at 77 K, mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). CO2 adsorption on the PEI/supports was evaluated using 2 vol % CO2 in flowing air on a self-assembled fixed bed reactor. The observations made here show that relative to the other four sorbent counterparts, PEI/PTNT and PEI/FS exhibit better performance of CO2 adsorption, mainly attributed to their more abundant secondary macropores, together with more homogeneous PEI surface dispersion. For all the PEI/supports, the adsorption data of CO2 at various pressure equilibriums were modeled by the Langmuir dual-site isotherms. And the values of the fitted model parameters offer some hints that both chemisorption and physisorption are synchronously involved in these sorbent systems, one of which will govern the CO2 adsorption process, dependent on the nature of the supports used.
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高影响因子
CHEMISTRY OF MATERIALS
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2019
·
IF 10.159
Jingsong Cai,Juner Chen,Pingmei Zeng,Zhenfeng Pang,Xueqian Kong
Graphene oxides (GOs) are layered carbon materials composed of a mixture of oxygenated functional groups that can react with different molecules. Alkyl diamine molecules (ethylenediamine, butanediamine, or hexanediamine) can insert into the layers of GO and systematically expand its interlayer spacing from 0.762 nm to over 1.030 nm. In this work, we found that CO2 uptake maximizes at the interlayer spacing of 0.860 nm in GOs cross-linked by diamines. We characterized the subtle chemical and compositional differences among samples by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and solid-state NMR. In situ 13C NMR was applied at variable temperatures to investigate the adsorption mechanisms of CO2, which revealed both physically and chemically adsorbed CO2 in diamine-cross-linked GO matrices. In particular, we observed the unique state of CO2 that are physically trapped in GO layers with 0.860 nm spacing by van der Waals interactions. This state of CO2 was not observed in GOs with either smaller or larger interlayer spacings.
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高影响因子
GREEN CHEMISTRY
·
2015
·Vol. 18
·期 2
·524-530
·
IF 8.02
Jin Wang,Hongming Zhang,Yuyang Miao,Lijun Qiao,Xianhong Wang,Fosong Wang
Carbon dioxide based oligo(carbonate–ether) diols (CO2-polyols) with both carbonate units and ether units in one polymer chain were prepared by copolymerization of CO2 and propylene oxide (PO) using a zinc–cobalt double metal complex as the catalyst, and used to prepare CO2 based waterborne polyurethanes (CO2-WPUs). The carbonate units in CO2-polyols improved the mechanical and oxidation resistance properties of CO2-WPUs, while the ether units in CO2-polyols enhanced the hydrolysis resistance of CO2-WPUs. The tensile strength of CO2-WPUs didn't show any obvious drop during immersion in a 0.25% sodium hydroxide solution, whereas that of oligoesterol based WPUs dropped over 50% after 300 min, and lost their mechanical properties after 520 min of immersion. Meanwhile, the retention of the tensile strength of the CO2-WPUs was ca. 72% even after 46 h of immersion in a 6 wt% H2O2 solution, while it was only ca. 32% for the oligoetherol based WPUs. Moreover, the thermal–mechanical performance of CO2-WPU films can be conveniently improved by adjusting the carbonate unit content (CU%) in CO2-polyols, i.e. when CU% in CO2-polyol increased from 30% to 66%, the glass transition temperature (Tg) increased from −7.8 °C to 18.8 °C, accompanied by an increase of tensile strength from 35.6 MPa to 52.2 MPa, and a decrease of elongation at break from 630% to 410%. This work suggests that the CO2-WPU may be a promising alternative to conventional WPU whose oligoetherol and oligoesterol were from fossil resources, and its comprehensive hydrolysis/oxidation resistance may be a bonus unavailable from common oligomerol based WPUs.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2014
·
IF 4.908
Wenjuan He,Zhi Wang,Wen Li,Shichun Li,Zhiheng Bai,Jixiao Wang,Shichang Wang
Fixed carrier membranes containing amino groups show attractive performance in CO 2 separation for clean energy supply and greenhouse gas reduction. However, the separation performance of fixed carrier membranes at high feed pressure is limited by the facilitated transport ability of membranes as well as the CO 2 -induced plasticization. In this work, the tertiary amino group containing fixed carrier membranes were prepared by interfacial polymerization (IP) with hexane-soluble trimesoyl chloride (TMC) and aqueous-soluble 1,4-bis (3-aminopropyl) piperazine (DAPP), N -aminoethylpiperazine (EAP) and 3,3′-diamino- N -methyldipropylamine (DNMDAm). The results show that the membrane prepared with TMC and DAPP exhibits the highest CO 2 separation performance due to efficient CO 2 facilitated transport and high plasticization resistance. Efficient facilitated transport of CO 2 in the membrane is due to the high content of cyclic tertiary amino groups which possess high stoichiometric CO 2 loading and high rate constant of amine-CO 2 reaction. Moreover, high plasticization resistance of the membrane is attributed to the appropriate stiffness of polymer chains provided by IP. The membrane prepared with TMC and DAPP shows promising applications in high-pressure fuel gas purification.
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高影响因子
CARBON
·
2013
·
IF 5.868
Xiangqian Fan,Lingxia Zhang,Guobin Zhang,Zhu Shu,Jianlin Shi
Nitrogen-doped microporous carbons were fabricated by a simple chemical activation strategy in which chitosan and K 2 CO 3 were employed as the precursor and activation agent, respectively. The textural and chemical properties of the porous carbons could be easily tuned by changing the ratio of K 2 CO 3 /chitosan and activation temperature. Due to their large pore volume , well-defined microporosity and relatively high nitrogen content, these porous carbons were applied as adsorbents for CO 2 capture and demonstrated excellent CO 2 uptake performances. In particular, the sample prepared at 635 °C with K 2 CO 3 /chitosan ratio = 2 shows a CO 2 uptake as high as 3.86 mmol g −1 at 25 °C, 1 atm. Furthermore, the CO 2 uptake remains almost constant in five consecutive adsorption–desorption cycles, indicating this material has great stability and recyclability as a CO 2 sorbent . In addition, an extraordinary separation selectivity against N 2 (CO 2 /N 2 selectivity of ca. 21) was also observed.
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高影响因子
ChemSusChem
·
2016
·Vol. 9
·期 8
·806-812
·
IF 7.116
Qiwei Yang,Zhiping Wang,Zongbi Bao,Zhiguo Zhang,Yiwen Yang,Qilong Ren,Huabin Xing,Sheng Dai
Graphical Soak it up : The electrostatic environment around amine groups in ionic liquids (ILs) has critical influence on their CO 2 absorption mechanism, which enables the achievement of higher CO 2 capacity by tuning the local structure around the amine. Moreover, this work indicates that the actual CO 2 absorption mechanism by amino-acid ILs goes beyond the apparent CO 2 /amine stoichiometry. The last decade saw an explosion of interest in using amine-functionalized materials for CO 2 capture and conversion, and it is of great importance to elucidate the relationship between the molecular structure of amine-functionalized materials and their CO 2 capacity. In this work, based on a new quantitative analysis method for the CO 2 absorption mechanism of amino-acid ionic liquids (ILs) and quantum chemical calculations, we show that the small difference in the local structure of amine groups in ILs could lead to much different CO 2 absorption mechanisms, which provides an opportunity for achieving higher CO 2 capacity by structure design. This work revealed that the actual CO 2 absorption mechanism by amino-acid ILs goes beyond the apparent CO 2 /amine stoichiometry; a rigid ring structure around the amine group in ILs creates a unique electrostatic environment that inhibits the deprotonation of carbamic acid and enables actually equimolar CO 2 /amine absorption.
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PubMed
高影响因子
危险品化学品经营许可证（带存储）